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Meta: Add license header to source files As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
2020-01-18 08:38:21 +00:00
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
Kernel: Enforce W^X between sys$mmap() and sys$execve() It's now an error to sys$mmap() a file as writable if it's currently mapped executable by anyone else. It's also an error to sys$execve() a file that's currently mapped writable by anyone else. This fixes a race condition vulnerability where one program could make modifications to an executable while another process was in the kernel, in the middle of exec'ing the same executable. Test: Kernel/elf-execve-mmap-race.cpp
2020-01-18 22:31:29 +00:00
#include <AK/Demangle.h>
LibELF: Make ELF::Loader RefCounted
2020-04-17 11:40:38 +00:00
#include <AK/RefPtr.h>
Kernel: Tighten up exec/do_exec and allow for PT_INTERP iterpreters This patch changes how exec() figures out which program image to actually load. Previously, we opened the path to our main executable in find_shebang_interpreter_for_executable, read the first page (or less, if the file was smaller) and then decided whether to recurse with the interpreter instead. We then then re-opened the main executable in do_exec. However, since we now want to parse the ELF header and Program Headers of an elf image before even doing any memory region work, we can change the way this whole process works. We open the file and read (up to) the first page in exec() itself, then pass just the page and the amount read to find_shebang_interpreter_for_executable. Since we now have that page and the FileDescription for the main executable handy, we can do a few things. First, validate the ELF header and ELF program headers for any shenanigans. ELF32 Little Endian i386 only, please. Second, we can grab the PT_INTERP interpreter from any ET_DYN files, and open that guy right away if it exists. Finally, we can pass the main executable's and optionally the PT_INTERP interpreter's file descriptions down to do_exec and not have to feel guilty about opening the file twice. In do_exec, we now have a choice. Are we going to load the main executable, or the interpreter? We could load both, but it'll be way easier for the inital pass on the RTLD if we only load the interpreter. Then it can load the main executable itself like any old shared object, just, the one with main in it :). Later on we can load both of them into memory and the RTLD can relocate itself before trying to do anything. The way it's written now the RTLD will get dibs on its requested virtual addresses being the actual virtual addresses.
2020-01-11 01:28:02 +00:00
#include <AK/ScopeGuard.h>
LibC: Implement pselect pselect() is similar() to select(), but it takes its timeout as timespec instead of as timeval, and it takes an additional sigmask parameter. Change the sys$select parameters to match pselect() and implement select() in terms of pselect().
2020-06-21 17:54:41 +00:00
#include <AK/ScopedValueRollback.h>
Kernel: Run clang-format on everything.
2019-06-07 09:43:58 +00:00
#include <AK/StdLibExtras.h>
Move WindowServer to userspace. This is a monster patch that required changing a whole bunch of things. There are performance and stability issues all over the place, but it works. Pretty cool, I have to admit :^)
2019-02-16 23:13:47 +00:00
#include <AK/StringBuilder.h>
Kernel: Fix timeout support in select The scheduler expects m_select_timeout to act as a deadline. That is, it should contain the time that a task should wake at -- but we were directly copying the time from userspace, which meant that it always returned virtually immediately. At the same time, fix CEventLoop to not rely on the broken select behavior by subtracting the current time from the time of the nearest timer.
2019-05-18 00:00:01 +00:00
#include <AK/Time.h>
Kernel: Run clang-format on everything.
2019-06-07 09:43:58 +00:00
#include <AK/Types.h>
Kernel: Remove redundant "ACPI" from filenames in ACPI/
2020-04-09 16:17:27 +00:00
#include <Kernel/ACPI/Parser.h>
Kernel+LibELF: Expose ELF Auxiliary Vector to Userspace The AT_* entries are placed after the environment variables, so that they can be found by iterating until the end of the envp array, and then going even further beyond :^)
2020-07-04 23:37:36 +00:00
#include <Kernel/API/Syscall.h>
Kernel: Move i386.{cpp,h} => Arch/i386/CPU.{cpp,h} There's a ton of work that would need to be done before we could spin up on another architecture, but let's at least try to separate things out a bit.
2019-06-07 18:02:01 +00:00
#include <Kernel/Arch/i386/CPU.h>
Kernel + LibC: Handle running processes in do_waitid()
2020-05-15 22:32:14 +00:00
#include <Kernel/Console.h>
Kernel: Add forward declaration header
2020-02-16 00:50:16 +00:00
#include <Kernel/Devices/BlockDevice.h>
Kernel: Implement the setkeymap() syscall.
2019-11-23 07:48:07 +00:00
#include <Kernel/Devices/KeyboardDevice.h>
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
#include <Kernel/Devices/NullDevice.h>
FileSystem: Port most of the code over to using custodies. The current working directory is now stored as a custody. Likewise for a process executable file. This unbreaks /proc/PID/fd which has not been working since we made the filesystem bigger. This still needs a bunch of work, for instance when renaming or removing a file somewhere, we have to update the relevant custody links.
2019-05-30 16:58:59 +00:00
#include <Kernel/FileSystem/Custody.h>
Kernel+LibC+Userland: Support mounting other kinds of filesystems
2019-08-15 16:13:56 +00:00
#include <Kernel/FileSystem/DevPtsFS.h>
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
#include <Kernel/FileSystem/Ext2FileSystem.h>
Kernel: Run clang-format on everything.
2019-06-07 09:43:58 +00:00
#include <Kernel/FileSystem/FIFO.h>
#include <Kernel/FileSystem/FileDescription.h>
Kernel: Add a mechanism for listening for changes to an inode. The syscall is quite simple: int watch_file(const char* path, int path_length); It returns a file descriptor referring to a "InodeWatcher" object in the kernel. It becomes readable whenever something changes about the inode. Currently this is implemented by hooking the "metadata dirty bit" in Inode which isn't perfect, but it's a start. :^)
2019-07-22 18:01:11 +00:00
#include <Kernel/FileSystem/InodeWatcher.h>
Kernel: Add Plan9FS :^) This is an (incomplete, and not very stable) implementation of the client side of the 9P protocol.
2020-07-02 10:05:56 +00:00
#include <Kernel/FileSystem/Plan9FileSystem.h>
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
#include <Kernel/FileSystem/ProcFS.h>
#include <Kernel/FileSystem/TmpFS.h>
Kernel: Run clang-format on everything.
2019-06-07 09:43:58 +00:00
#include <Kernel/FileSystem/VirtualFileSystem.h>
ELF: Fail layout when program header hooks return nullptr (#673) ELFLoader::layout() had a "failed" variable that was never set. This patch checks the return value of each hook (alloc/map section and tls) and fails the load if they return null. I also needed to patch Process so that the alloc_section_hook and map_section_hook actually return nullptr when allocating a region fails. Fixes #664 :)
2019-10-20 14:24:42 +00:00
#include <Kernel/Heap/kmalloc.h>
Kernel + LibC: Handle running processes in do_waitid()
2020-05-15 22:32:14 +00:00
#include <Kernel/IO.h>
Kernel: Use KBufferBuilder to build ProcFS files and backtraces This is not perfect as it uses a lot of VM, but since the buffers are supposed to be temporary it's not super terrible. This could be improved by giving back the unused VM to the kernel's RangeAllocator after finishing the buffer building.
2019-08-07 19:52:43 +00:00
#include <Kernel/KBufferBuilder.h>
Kernel: Qualify a bunch of #include statements.
2019-06-07 17:29:34 +00:00
#include <Kernel/KSyms.h>
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
#include <Kernel/Module.h>
Kernel: Make better use of the multiboot info. Define the multiboot info struct properly so we don't have to grab at byte offsets in the memory access checker code. Also print kernel command line in init().
2019-06-02 07:50:18 +00:00
#include <Kernel/Multiboot.h>
Kernel: Reduce header dependencies of Process and Thread
2020-02-16 01:01:42 +00:00
#include <Kernel/PerformanceEventBuffer.h>
Kernel: Qualify a bunch of #include statements.
2019-06-07 17:29:34 +00:00
#include <Kernel/Process.h>
#include <Kernel/RTC.h>
#include <Kernel/Scheduler.h>
SharedBuffer: Fix deadlock on destroy We were locking the list of references, and then destroying the reference, which made things go a little crazy. It's more straightforward to just remove the per-reference lock: the syscalls all have to lock the full list anyway, so let's just do that and avoid the hassle. While I'm at it, also move the SharedBuffer code out to its own file as it's getting a little long and unwieldly, and Process.cpp is already huge.
2019-07-16 13:03:39 +00:00
#include <Kernel/SharedBuffer.h>
Kernel + LibC: Handle running processes in do_waitid()
2020-05-15 22:32:14 +00:00
#include <Kernel/StdLib.h>
Kernel: Run clang-format on everything.
2019-06-07 09:43:58 +00:00
#include <Kernel/TTY/MasterPTY.h>
Kernel: Reduce header dependencies of Process and Thread
2020-02-16 01:01:42 +00:00
#include <Kernel/TTY/TTY.h>
Kernel: Move E2BIG calculation from Thread to Process Thread::make_userspace_stack_for_main_thread is only ever called from Process::do_exec, after all the fun ELF loading and TSS setup has occured. The calculations in there that check if the combined argv + envp size will exceed the default stack size are not used in the rest of the stack setup. So, it should be safe to move this to the beginning of do_exec and bail early with -E2BIG, just like the man pages say. Additionally, advertise this limit in limits.h to be a good POSIX.1 citizen. :)
2019-10-20 16:11:40 +00:00
#include <Kernel/Thread.h>
Kernel: Add 'ptrace' syscall This commit adds a basic implementation of the ptrace syscall, which allows one process (the tracer) to control another process (the tracee). While a process is being traced, it is stopped whenever a signal is received (other than SIGCONT). The tracer can start tracing another thread with PT_ATTACH, which causes the tracee to stop. From there, the tracer can use PT_CONTINUE to continue the execution of the tracee, or use other request codes (which haven't been implemented yet) to modify the state of the tracee. Additional request codes are PT_SYSCALL, which causes the tracee to continue exection but stop at the next entry or exit from a syscall, and PT_GETREGS which fethces the last saved register set of the tracee (can be used to inspect syscall arguments and return value). A special request code is PT_TRACE_ME, which is issued by the tracee and causes it to stop when it calls execve and wait for the tracer to attach.
2020-03-28 08:47:16 +00:00
#include <Kernel/ThreadTracer.h>
Kernel: Introduce the new Time management subsystem This new subsystem includes better abstractions of how time will be handled in the OS. We take advantage of the existing RTC timer to aid in keeping time synchronized. This is standing in contrast to how we handled time-keeping in the kernel, where the PIT was responsible for that function in addition to update the scheduler about ticks. With that new advantage, we can easily change the ticking dynamically and still keep the time synchronized. In the process context, we no longer use a fixed declaration of TICKS_PER_SECOND, but we call the TimeManagement singleton class to provide us the right value. This allows us to use dynamic ticking in the future, a feature known as tickless kernel. The scheduler no longer does by himself the calculation of real time (Unix time), and just calls the TimeManagment singleton class to provide the value. Also, we can use 2 new boot arguments: - the "time" boot argument accpets either the value "modern", or "legacy". If "modern" is specified, the time management subsystem will try to setup HPET. Otherwise, for "legacy" value, the time subsystem will revert to use the PIT & RTC, leaving HPET disabled. If this boot argument is not specified, the default pattern is to try to setup HPET. - the "hpet" boot argumet accepts either the value "periodic" or "nonperiodic". If "periodic" is specified, the HPET will scan for periodic timers, and will assert if none are found. If only one is found, that timer will be assigned for the time-keeping task. If more than one is found, both time-keeping task & scheduler-ticking task will be assigned to periodic timers. If this boot argument is not specified, the default pattern is to try to scan for HPET periodic timers. This boot argument has no effect if HPET is disabled. In hardware context, PIT & RealTimeClock classes are merely inheriting from the HardwareTimer class, and they allow to use the old i8254 (PIT) and RTC devices, managing them via IO ports. By default, the RTC will be programmed to a frequency of 1024Hz. The PIT will be programmed to a frequency close to 1000Hz. About HPET, depending if we need to scan for periodic timers or not, we try to set a frequency close to 1000Hz for the time-keeping timer and scheduler-ticking timer. Also, if possible, we try to enable the Legacy replacement feature of the HPET. This feature if exists, instructs the chipset to disconnect both i8254 (PIT) and RTC. This behavior is observable on QEMU, and was verified against the source code: https://github.com/qemu/qemu/commit/ce967e2f33861b0e17753f97fa4527b5943c94b6 The HPETComparator class is inheriting from HardwareTimer class, and is responsible for an individual HPET comparator, which is essentially a timer. Therefore, it needs to call the singleton HPET class to perform HPET-related operations. The new abstraction of Hardware timers brings an opportunity of more new features in the foreseeable future. For example, we can change the callback function of each hardware timer, thus it makes it possible to swap missions between hardware timers, or to allow to use a hardware timer for other temporary missions (e.g. calibrating the LAPIC timer, measuring the CPU frequency, etc).
2020-03-09 15:03:27 +00:00
#include <Kernel/Time/TimeManagement.h>
Kernel: Reduce header dependencies of MemoryManager and Region
2020-02-16 00:33:41 +00:00
#include <Kernel/VM/PageDirectory.h>
Kernel: Use PrivateInodeVMObject for loading program executables This will be a memory usage pessimization until we actually implement CoW sharing of the memory pages with SharedInodeVMObject. However, it's a huge architectural improvement, so let's take it and improve on this incrementally. fork() should still be neutral, since all private mappings are CoW'ed.
2020-03-01 10:14:56 +00:00
#include <Kernel/VM/PrivateInodeVMObject.h>
ptrace: Add PT_PEEK PT_PEEK reads a single word from the tracee's address space and returns it to the tracer.
2020-04-04 08:26:56 +00:00
#include <Kernel/VM/ProcessPagingScope.h>
Kernel: Start implementing purgeable memory support It's now possible to get purgeable memory by using mmap(MAP_PURGEABLE). Purgeable memory has a "volatile" flag that can be set using madvise(): - madvise(..., MADV_SET_VOLATILE) - madvise(..., MADV_SET_NONVOLATILE) When in the "volatile" state, the kernel may take away the underlying physical memory pages at any time, without notifying the owner. This gives you a guilt discount when caching very large things. :^) Setting a purgeable region to non-volatile will return whether or not the memory has been taken away by the kernel while being volatile. Basically, if madvise(..., MADV_SET_NONVOLATILE) returns 1, that means the memory was purged while volatile, and whatever was in that piece of memory needs to be reconstructed before use.
2019-12-09 18:12:38 +00:00
#include <Kernel/VM/PurgeableVMObject.h>
Kernel: Remove some unnecessary indirection in InodeFile::mmap() InodeFile now directly calls Process::allocate_region_with_vmobject() instead of taking an awkward detour via a special Region constructor.
2020-02-28 19:29:14 +00:00
#include <Kernel/VM/SharedInodeVMObject.h>
Kernel: Run clang-format on everything.
2019-06-07 09:43:58 +00:00
#include <LibC/errno_numbers.h>
Kernel: writev() should fail with EINVAL if total length > INT32_MAX
2020-01-02 12:01:41 +00:00
#include <LibC/limits.h>
Kernel: Run clang-format on everything.
2019-06-07 09:43:58 +00:00
#include <LibC/signal_numbers.h>
LibELF: Move ELF classes into namespace ELF This is for consistency with other namespace changes that were made a while back to the other libraries :)
2020-04-11 18:24:07 +00:00
#include <LibELF/Loader.h>
LibELF: Move validation methods to their own file These validate_elf_* methods really had no business being static methods of ELF::Image. Now that the ELF namespace exists, it makes sense to just move them to be free functions in the namespace.
2020-04-11 18:32:38 +00:00
#include <LibELF/Validation.h>
Kernel: Process, replace internal data type to CharacterMapData
2020-06-11 19:06:36 +00:00
#include <LibKeyboard/CharacterMapData.h>
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
Kernel: Fix signal delivery When delivering urgent signals to the current thread we need to check if we should be unblocked, and if not we need to yield to another process. We also need to make sure that we suppress context switches during Process::exec() so that we don't clobber the registers that it sets up (eip mainly) by a context switch. To be able to do that we add the concept of a critical section, which are similar to Process::m_in_irq but different in that they can be requested at any time. Calls to Scheduler::yield and Scheduler::donate_to will return instantly without triggering a context switch, but the processor will then asynchronously trigger a context switch once the critical section is left.
2020-07-03 11:19:50 +00:00
//#define PROCESS_DEBUG
Kernel: Add the ability to debug poll/select independently of read/write
2019-05-19 08:24:28 +00:00
//#define DEBUG_POLL_SELECT
Lots of hacking: - Turn Keyboard into a CharacterDevice (85,1) at /dev/keyboard. - Implement MM::unmapRegionsForTask() and MM::unmapRegion() - Save SS correctly on interrupt. - Add a simple Spawn syscall for launching another process. - Move a bunch of IO syscall debug output behind DEBUG_IO. - Have ASSERT do a "cli" immediately when failing. This makes the output look proper every time. - Implement a bunch of syscalls in LibC. - Add a simple shell ("sh"). All it can do now is read a line of text from /dev/keyboard and then try launching the specified executable by calling spawn(). There are definitely bugs in here, but we're moving on forward.
2018-10-23 08:12:50 +00:00
//#define DEBUG_IO
Kernel: SharedBuffer sharing cleanup Rather than limiting it to two shared processes, store a Vector of references, so we can add more if we want. Makes the code a little more generic. No actual change to the syscall interface yet, so nothing takes advantage of this yet.
2019-07-15 18:38:41 +00:00
//#define SIGNAL_DEBUG
Implement COW pages! :^) sys$fork() now clones all writable regions with per-page COW bits. The pages are then mapped read-only and we handle a PF by COWing the pages. This is quite delightful. Obviously there's lots of work to do still, and it needs better data structures, but the general concept works.
2018-11-05 12:48:07 +00:00
Kernel: Move all code into the Kernel namespace
2020-02-16 00:27:42 +00:00
namespace Kernel {
Kernel: Share the "return to ring 0/3 from signal" trampolines globally. Generate a special page containing the "return from signal" trampoline code on startup and then route signalled threads to it. This avoids a page allocation in every process that ever receives a signal.
2019-07-19 15:01:16 +00:00
static void create_signal_trampolines();
Kernel: Turn Thread::current and Process::current into functions This allows us to query the current thread and process on a per processor basis
2020-06-28 21:34:31 +00:00
RecursiveSpinLock g_processes_lock;
static Atomic<pid_t> next_pid;
Move the scheduler code to its own class. This is very mechanical.
2018-11-07 21:15:02 +00:00
InlineLinkedList<Process>* g_processes;
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
String* g_hostname;
Lock* g_hostname_lock;
Kernel: Share the "return to ring 0/3 from signal" trampolines globally. Generate a special page containing the "return from signal" trampoline code on startup and then route signalled threads to it. This avoids a page allocation in every process that ever receives a signal.
2019-07-19 15:01:16 +00:00
VirtualAddress g_return_to_ring3_from_signal_trampoline;
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
HashMap<String, OwnPtr<Module>>* g_modules;
Add sys$uname() and a /bin/uname utility.
2018-10-26 12:56:21 +00:00
Kernel: Make TID's be unique PID's This is a little strange, but it's how I understand things should work. The first thread in a new process now has TID == PID. Additional threads subsequently spawned in that process all have unique TID's generated by the PID allocator. TIDs are now globally unique.
2019-12-22 10:51:24 +00:00
pid_t Process::allocate_pid()
{
Kernel: Turn Thread::current and Process::current into functions This allows us to query the current thread and process on a per processor basis
2020-06-28 21:34:31 +00:00
return next_pid.fetch_add(1, AK::MemoryOrder::memory_order_acq_rel);
Kernel: Make TID's be unique PID's This is a little strange, but it's how I understand things should work. The first thread in a new process now has TID == PID. Additional threads subsequently spawned in that process all have unique TID's generated by the PID allocator. TIDs are now globally unique.
2019-12-22 10:51:24 +00:00
}
Process now maps regions immediately when they are allocated. This avoids having to do a separate MM.mapRegionsForTask() pass. Also, more Task => Process renaming that I apparently hadn't saved yet.
2018-11-01 12:15:46 +00:00
void Process::initialize()
Import the "gerbert" kernel I worked on earlier this year. It's a lot crappier than I remembered it. It's gonna need a lot of work.
2018-10-16 09:01:38 +00:00
{
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
g_modules = new HashMap<String, OwnPtr<Module>>;
Kernel: Turn Thread::current and Process::current into functions This allows us to query the current thread and process on a per processor basis
2020-06-28 21:34:31 +00:00
next_pid.store(0, AK::MemoryOrder::memory_order_release);
Move the scheduler code to its own class. This is very mechanical.
2018-11-07 21:15:02 +00:00
g_processes = new InlineLinkedList<Process>;
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
g_hostname = new String("courage");
g_hostname_lock = new Lock;
Kernel: Share the "return to ring 0/3 from signal" trampolines globally. Generate a special page containing the "return from signal" trampoline code on startup and then route signalled threads to it. This avoids a page allocation in every process that ever receives a signal.
2019-07-19 15:01:16 +00:00
create_signal_trampolines();
Basic ^C interrupt implementation. For testing, I made cat put itself into a new process group. This should eventually be done by sh between fork() and exec().
2018-11-02 13:06:48 +00:00
}
Kernel: Rewrite ProcFS. Now the filesystem is generated on-the-fly instead of manually adding and removing inodes as processes spawn and die. The code is convoluted and bloated as I wrote it while sleepless. However, it's still vastly better than the old ProcFS, so I'm committing it. I also added /proc/PID/fd/N symlinks for each of a process's open fd's.
2019-02-03 11:33:11 +00:00
Vector<pid_t> Process::all_pids()
{
Vector<pid_t> pids;
Kernel: Turn Thread::current and Process::current into functions This allows us to query the current thread and process on a per processor basis
2020-06-28 21:34:31 +00:00
ScopedSpinLock lock(g_processes_lock);
AK: SinglyLinkedList::size_slow() should return size_t
2019-12-09 16:48:58 +00:00
pids.ensure_capacity((int)g_processes->size_slow());
Kernel: Use some more InlineLinkedList range-for iteration
2019-08-08 12:40:13 +00:00
for (auto& process : *g_processes)
pids.append(process.pid());
Kernel: Rewrite ProcFS. Now the filesystem is generated on-the-fly instead of manually adding and removing inodes as processes spawn and die. The code is convoluted and bloated as I wrote it while sleepless. However, it's still vastly better than the old ProcFS, so I'm committing it. I also added /proc/PID/fd/N symlinks for each of a process's open fd's.
2019-02-03 11:33:11 +00:00
return pids;
}
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
NonnullRefPtrVector<Process> Process::all_processes()
Generate a basic /proc/summary file with some info about all tasks.
2018-10-23 10:44:46 +00:00
{
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
NonnullRefPtrVector<Process> processes;
Kernel: Turn Thread::current and Process::current into functions This allows us to query the current thread and process on a per processor basis
2020-06-28 21:34:31 +00:00
ScopedSpinLock lock(g_processes_lock);
AK: SinglyLinkedList::size_slow() should return size_t
2019-12-09 16:48:58 +00:00
processes.ensure_capacity((int)g_processes->size_slow());
Kernel: Use some more InlineLinkedList range-for iteration
2019-08-08 12:40:13 +00:00
for (auto& process : *g_processes)
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
processes.append(NonnullRefPtr<Process>(process));
Process now maps regions immediately when they are allocated. This avoids having to do a separate MM.mapRegionsForTask() pass. Also, more Task => Process renaming that I apparently hadn't saved yet.
2018-11-01 12:15:46 +00:00
return processes;
Generate a basic /proc/summary file with some info about all tasks.
2018-10-23 10:44:46 +00:00
}
Add chown() syscall and a simple /bin/chown program.
2019-02-27 11:32:53 +00:00
bool Process::in_group(gid_t gid) const
{
Kernel: Don't include the process GID in the "extra GIDs" table Process::m_extra_gids is for supplementary GIDs only.
2020-01-02 22:45:52 +00:00
return m_gid == gid || m_extra_gids.contains(gid);
Add chown() syscall and a simple /bin/chown program.
2019-02-27 11:32:53 +00:00
}
Kernel+LibC: Allow sys$mmap() callers to specify address alignment This is exposed via the non-standard serenity_mmap() call in userspace.
2020-02-16 11:55:56 +00:00
Range Process::allocate_range(VirtualAddress vaddr, size_t size, size_t alignment)
More paging stuff. The test userspace process now runs at linear address 0x300000 which is mapped to a dynamically allocated page from the MemoryManager. Cool!
2018-10-18 11:05:00 +00:00
{
Kernel: Rename LinearAddress => VirtualAddress.
2019-06-07 10:56:50 +00:00
vaddr.mask(PAGE_MASK);
Make GraphicsBitmaps be Region-backed when running in the kernel. This is a lot better than having them in kmalloc memory. I'm gonna need a way to keep track of which process owns which bitmap eventually, maybe through some sort of resource keying system. We'll see.
2019-01-12 23:27:25 +00:00
size = PAGE_ROUND_UP(size);
Kernel: Rename LinearAddress => VirtualAddress.
2019-06-07 10:56:50 +00:00
if (vaddr.is_null())
Kernel+LibC: Allow sys$mmap() callers to specify address alignment This is exposed via the non-standard serenity_mmap() call in userspace.
2020-02-16 11:55:56 +00:00
return page_directory().range_allocator().allocate_anywhere(size, alignment);
Kernel: Rename LinearAddress => VirtualAddress.
2019-06-07 10:56:50 +00:00
return page_directory().range_allocator().allocate_specific(vaddr, size);
Kernel: Factor out range allocation from Process::allocate_region*(). These functions were doing exactly the same thing for range allocation, so share that code in an allocate_range() helper. Region allocation will now also fail if range allocation fails, which means that mmap() can actually fail without falling apart. Exciting times!
2019-05-17 02:39:22 +00:00
}
Kernel: Implement a simple virtual address range allocator. This replaces the previous virtual address allocator which was basically just "m_next_address += size;" With this in place, virtual addresses can get reused, which cuts down on the number of page tables created. When we implement ASLR some day, we'll probably have to do page table deallocation, but for now page tables are only deallocated once the process dies.
2019-05-17 01:40:15 +00:00
Kernel: Rename vmo => vmobject everywhere
2019-12-19 18:13:44 +00:00
Region& Process::allocate_split_region(const Region& source_region, const Range& range, size_t offset_in_vmobject)
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
{
Kernel: Preserve CoW bits when splitting VM regions
2020-01-25 16:57:10 +00:00
auto& region = add_region(Region::create_user_accessible(range, source_region.vmobject(), offset_in_vmobject, source_region.name(), source_region.access()));
Kernel: Copy "stack" and "mmap" bits when splitting a Region
2020-01-29 18:24:42 +00:00
region.set_mmap(source_region.is_mmap());
region.set_stack(source_region.is_stack());
Kernel: Preserve CoW bits when splitting VM regions
2020-01-25 16:57:10 +00:00
size_t page_offset_in_source_region = (offset_in_vmobject - source_region.offset_in_vmobject()) / PAGE_SIZE;
for (size_t i = 0; i < region.page_count(); ++i) {
if (source_region.should_cow(page_offset_in_source_region + i))
region.set_should_cow(i, true);
}
return region;
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
}
Kernel: Propagate failure to commit VM regions in more places Ultimately we should not panic just because we can't fully commit a VM region (by populating it with physical pages.) This patch handles some of the situations where commit() can fail.
2020-05-08 19:47:08 +00:00
Region* Process::allocate_region(const Range& range, const String& name, int prot, bool should_commit)
Kernel: Factor out range allocation from Process::allocate_region*(). These functions were doing exactly the same thing for range allocation, so share that code in an allocate_range() helper. Region allocation will now also fail if range allocation fails, which means that mmap() can actually fail without falling apart. Exciting times!
2019-05-17 02:39:22 +00:00
{
Kernel+LibC: Allow sys$mmap() callers to specify address alignment This is exposed via the non-standard serenity_mmap() call in userspace.
2020-02-16 11:55:56 +00:00
ASSERT(range.is_valid());
Kernel: Remove some Region construction helpers It's now up to the caller to provide a VMObject when constructing a new Region object. This will make it easier to handle things going wrong, like allocation failures, etc.
2020-03-01 10:02:22 +00:00
auto vmobject = AnonymousVMObject::create_with_size(range.size());
Kernel: Propagate failure to commit VM regions in more places Ultimately we should not panic just because we can't fully commit a VM region (by populating it with physical pages.) This patch handles some of the situations where commit() can fail.
2020-05-08 19:47:08 +00:00
auto region = Region::create_user_accessible(range, vmobject, 0, name, prot_to_region_access_flags(prot));
region->map(page_directory());
if (should_commit && !region->commit())
return nullptr;
return &add_region(move(region));
More paging stuff. The test userspace process now runs at linear address 0x300000 which is mapped to a dynamically allocated page from the MemoryManager. Cool!
2018-10-18 11:05:00 +00:00
}
Kernel: Propagate failure to commit VM regions in more places Ultimately we should not panic just because we can't fully commit a VM region (by populating it with physical pages.) This patch handles some of the situations where commit() can fail.
2020-05-08 19:47:08 +00:00
Region* Process::allocate_region(VirtualAddress vaddr, size_t size, const String& name, int prot, bool should_commit)
Kernel+LibC: Allow sys$mmap() callers to specify address alignment This is exposed via the non-standard serenity_mmap() call in userspace.
2020-02-16 11:55:56 +00:00
{
auto range = allocate_range(vaddr, size);
if (!range.is_valid())
return nullptr;
Kernel: Propagate failure to commit VM regions in more places Ultimately we should not panic just because we can't fully commit a VM region (by populating it with physical pages.) This patch handles some of the situations where commit() can fail.
2020-05-08 19:47:08 +00:00
return allocate_region(range, name, prot, should_commit);
Kernel+LibC: Allow sys$mmap() callers to specify address alignment This is exposed via the non-standard serenity_mmap() call in userspace.
2020-02-16 11:55:56 +00:00
}
Kernel: Remove ability to create kernel-only regions at user addresses This was only used by the mechanism for mapping executables into each process's own address space. Now that we remap executables on demand when needed for symbolication, this can go away.
2020-03-02 09:46:24 +00:00
Region* Process::allocate_region_with_vmobject(const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const String& name, int prot)
Teach Process::exec() about the magic of file-backed VMO's. This is really sweet! :^) The four instances of /bin/sh spawned at startup now share their read-only text pages. There are problems and limitations here, and plenty of room for improvement. But it kinda works.
2018-11-08 20:20:09 +00:00
{
Kernel+LibC: Allow sys$mmap() callers to specify address alignment This is exposed via the non-standard serenity_mmap() call in userspace.
2020-02-16 11:55:56 +00:00
ASSERT(range.is_valid());
size_t end_in_vmobject = offset_in_vmobject + range.size();
Kernel: Use a FixedArray for a process's extra GIDs There's not really enough of these to justify using a HashTable.
2020-02-18 09:19:32 +00:00
if (end_in_vmobject <= offset_in_vmobject) {
Process: Use dbg() instead of dbgprintf() Also, fix a bad derefernce in sys$create_shared_buffer() method.
2020-02-24 22:13:33 +00:00
dbg() << "allocate_region_with_vmobject: Overflow (offset + size)";
Kernel: Validate the requested range in allocate_region_with_vmobject()
2020-01-18 13:37:22 +00:00
return nullptr;
}
if (offset_in_vmobject >= vmobject->size()) {
Process: Use dbg() instead of dbgprintf() Also, fix a bad derefernce in sys$create_shared_buffer() method.
2020-02-24 22:13:33 +00:00
dbg() << "allocate_region_with_vmobject: Attempt to allocate a region with an offset past the end of its VMObject.";
Kernel: Validate the requested range in allocate_region_with_vmobject()
2020-01-18 13:37:22 +00:00
return nullptr;
}
if (end_in_vmobject > vmobject->size()) {
Process: Use dbg() instead of dbgprintf() Also, fix a bad derefernce in sys$create_shared_buffer() method.
2020-02-24 22:13:33 +00:00
dbg() << "allocate_region_with_vmobject: Attempt to allocate a region with an end past the end of its VMObject.";
Kernel: Validate the requested range in allocate_region_with_vmobject()
2020-01-18 13:37:22 +00:00
return nullptr;
}
Kernel: Rename vmo => vmobject everywhere
2019-12-19 18:13:44 +00:00
offset_in_vmobject &= PAGE_MASK;
Kernel: Remove ability to create kernel-only regions at user addresses This was only used by the mechanism for mapping executables into each process's own address space. Now that we remap executables on demand when needed for symbolication, this can go away.
2020-03-02 09:46:24 +00:00
auto& region = add_region(Region::create_user_accessible(range, move(vmobject), offset_in_vmobject, name, prot_to_region_access_flags(prot)));
region.map(page_directory());
return &region;
Teach Process::exec() about the magic of file-backed VMO's. This is really sweet! :^) The four instances of /bin/sh spawned at startup now share their read-only text pages. There are problems and limitations here, and plenty of room for improvement. But it kinda works.
2018-11-08 20:20:09 +00:00
}
Kernel: Remove ability to create kernel-only regions at user addresses This was only used by the mechanism for mapping executables into each process's own address space. Now that we remap executables on demand when needed for symbolication, this can go away.
2020-03-02 09:46:24 +00:00
Region* Process::allocate_region_with_vmobject(VirtualAddress vaddr, size_t size, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const String& name, int prot)
Kernel+LibC: Allow sys$mmap() callers to specify address alignment This is exposed via the non-standard serenity_mmap() call in userspace.
2020-02-16 11:55:56 +00:00
{
auto range = allocate_range(vaddr, size);
if (!range.is_valid())
return nullptr;
Kernel: Remove ability to create kernel-only regions at user addresses This was only used by the mechanism for mapping executables into each process's own address space. Now that we remap executables on demand when needed for symbolication, this can go away.
2020-03-02 09:46:24 +00:00
return allocate_region_with_vmobject(range, move(vmobject), offset_in_vmobject, name, prot);
Kernel+LibC: Allow sys$mmap() callers to specify address alignment This is exposed via the non-standard serenity_mmap() call in userspace.
2020-02-16 11:55:56 +00:00
}
Use ELF program headers to load executables smarter. This turned out way better than the old code. ELF loading is now quite straightforward, and we don't need the weird concept of subregions anymore. Next step is to respect the is_writable flag.
2018-11-03 10:28:23 +00:00
bool Process::deallocate_region(Region& region)
Add simplified mmap() and munmap() syscalls.
2018-10-24 07:48:24 +00:00
{
Kernel: Make sure to drop region with interrupts enabled A region can drop an inode if it was mmaped from the inode and held the last reference to it, and that may require some locking.
2020-07-02 08:53:19 +00:00
OwnPtr<Region> region_protector;
Kernel: Turn Thread::current and Process::current into functions This allows us to query the current thread and process on a per processor basis
2020-06-28 21:34:31 +00:00
ScopedSpinLock lock(m_lock);
Kernel: Make sure to drop region with interrupts enabled A region can drop an inode if it was mmaped from the inode and held the last reference to it, and that may require some locking.
2020-07-02 08:53:19 +00:00
Kernel: Add a 1-deep cache to Process::region_from_range() This simple cache gets hit over 70% of the time on "g++ Process.cpp" and shaves ~3% off the runtime.
2020-01-19 15:44:37 +00:00
if (m_region_lookup_cache.region == &region)
m_region_lookup_cache.region = nullptr;
AK: Make Vector use size_t for its size and capacity
2020-02-25 13:49:47 +00:00
for (size_t i = 0; i < m_regions.size(); ++i) {
Kernel: Use NonnullRefPtrVector in parts of the kernel.
2019-06-27 11:34:28 +00:00
if (&m_regions[i] == &region) {
Kernel: Make sure to drop region with interrupts enabled A region can drop an inode if it was mmaped from the inode and held the last reference to it, and that may require some locking.
2020-07-02 08:53:19 +00:00
region_protector = m_regions.unstable_take(i);
Add simplified mmap() and munmap() syscalls.
2018-10-24 07:48:24 +00:00
return true;
}
}
return false;
}
Kernel: Rename region_from_foo() => find_region_from_foo() Let's emphasize that these functions actually go out and find regions.
2020-07-30 21:52:28 +00:00
Region* Process::find_region_from_range(const Range& range)
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
{
Kernel: Turn Thread::current and Process::current into functions This allows us to query the current thread and process on a per processor basis
2020-06-28 21:34:31 +00:00
ScopedSpinLock lock(m_lock);
Kernel: Add a 1-deep cache to Process::region_from_range() This simple cache gets hit over 70% of the time on "g++ Process.cpp" and shaves ~3% off the runtime.
2020-01-19 15:44:37 +00:00
if (m_region_lookup_cache.range == range && m_region_lookup_cache.region)
return m_region_lookup_cache.region;
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
size_t size = PAGE_ROUND_UP(range.size());
for (auto& region : m_regions) {
Kernel: Add a 1-deep cache to Process::region_from_range() This simple cache gets hit over 70% of the time on "g++ Process.cpp" and shaves ~3% off the runtime.
2020-01-19 15:44:37 +00:00
if (region.vaddr() == range.base() && region.size() == size) {
m_region_lookup_cache.range = range;
Kernel: Make Region weakable and use WeakPtr<Region> instead of Region* This turns use-after-free bugs into null pointer dereferences instead.
2020-02-24 12:24:30 +00:00
m_region_lookup_cache.region = region.make_weak_ptr();
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
return &region;
Kernel: Add a 1-deep cache to Process::region_from_range() This simple cache gets hit over 70% of the time on "g++ Process.cpp" and shaves ~3% off the runtime.
2020-01-19 15:44:37 +00:00
}
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
}
return nullptr;
}
Kernel: Rename region_from_foo() => find_region_from_foo() Let's emphasize that these functions actually go out and find regions.
2020-07-30 21:52:28 +00:00
Region* Process::find_region_containing(const Range& range)
Add simplified mmap() and munmap() syscalls.
2018-10-24 07:48:24 +00:00
{
Kernel: Turn Thread::current and Process::current into functions This allows us to query the current thread and process on a per processor basis
2020-06-28 21:34:31 +00:00
ScopedSpinLock lock(m_lock);
Add simplified mmap() and munmap() syscalls.
2018-10-24 07:48:24 +00:00
for (auto& region : m_regions) {
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
if (region.contains(range))
Kernel: Use NonnullRefPtrVector in parts of the kernel.
2019-06-27 11:34:28 +00:00
return &region;
Add simplified mmap() and munmap() syscalls.
2018-10-24 07:48:24 +00:00
}
return nullptr;
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void Process::kill_threads_except_self()
Add sys$set_mmap_name and use it from LibC's malloc. It's nice to be able to identify mmap's in /proc/PID/vm.
2018-10-28 08:57:22 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
InterruptDisabler disabler;
Add sys$set_mmap_name and use it from LibC's malloc. It's nice to be able to identify mmap's in /proc/PID/vm.
2018-10-28 08:57:22 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (thread_count() <= 1)
return;
Kernel: Clarify the various input validity checks in mmap() Also share some validation logic between mmap() and mprotect().
2019-12-25 20:50:13 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
auto current_thread = Thread::current();
for_each_thread([&](Thread& thread) {
if (&thread == current_thread
|| thread.state() == Thread::State::Dead
|| thread.state() == Thread::State::Dying)
return IterationDecision::Continue;
Kernel: Clarify the various input validity checks in mmap() Also share some validation logic between mmap() and mprotect().
2019-12-25 20:50:13 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
// At this point, we have no joiner anymore
thread.m_joiner = nullptr;
thread.set_should_die();
Kernel: Clarify the various input validity checks in mmap() Also share some validation logic between mmap() and mprotect().
2019-12-25 20:50:13 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (thread.state() != Thread::State::Dead)
thread.set_state(Thread::State::Dying);
Kernel: Clarify the various input validity checks in mmap() Also share some validation logic between mmap() and mprotect().
2019-12-25 20:50:13 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return IterationDecision::Continue;
});
Kernel: Implement basic support for sys$mmap() with MAP_PRIVATE You can now mmap a file as private and writable, and the changes you make will only be visible to you. This works because internally a MAP_PRIVATE region is backed by a unique PrivateInodeVMObject instead of using the globally shared SharedInodeVMObject like we always did before. :^) Fixes #1045.
2020-02-28 19:47:27 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
big_lock().clear_waiters();
Kernel: Validate PROT_READ and PROT_WRITE against underlying file This patch fixes some issues with the mmap() and mprotect() syscalls, neither of whom were checking the permission bits of the underlying files when mapping an inode MAP_SHARED. This made it possible to subvert execution of any running program by simply memory-mapping its executable and replacing some of the code. Test: Kernel/mmap-write-into-running-programs-executable-file.cpp
2020-01-07 18:29:18 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void Process::kill_all_threads()
Kernel: sys$mprotect protects sub-regions as well as whole ones Split a region into two/three if the desired mprotect range is a strict subset of an existing region. We can then set the access bits on a new region that is just our desired range and add both the new desired subregion and the leftovers back to our page tables.
2019-12-30 20:11:25 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
for_each_thread([&](Thread& thread) {
thread.set_should_die();
return IterationDecision::Continue;
});
Kernel: sys$mprotect protects sub-regions as well as whole ones Split a region into two/three if the desired mprotect range is a strict subset of an existing region. We can then set the access bits on a new region that is just our desired range and add both the new desired subregion and the leftovers back to our page tables.
2019-12-30 20:11:25 +00:00
}
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
RefPtr<Process> Process::create_user_process(Thread*& first_thread, const String& path, uid_t uid, gid_t gid, pid_t parent_pid, int& error, Vector<String>&& arguments, Vector<String>&& environment, TTY* tty)
Add simplified mmap() and munmap() syscalls.
2018-10-24 07:48:24 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
auto parts = path.split('/');
if (arguments.is_empty()) {
arguments.append(parts.last());
Kernel: Use the Syscall string and buffer types more While I was updating syscalls to stop passing null-terminated strings, I added some helpful struct types: - StringArgument { const char*; size_t; } - ImmutableBuffer<Data, Size> { const Data*; Size; } - MutableBuffer<Data, Size> { Data*; Size; } The Process class has some convenience functions for validating and optionally extracting the contents from these structs: - get_syscall_path_argument(StringArgument) - validate_and_copy_string_from_user(StringArgument) - validate(ImmutableBuffer) - validate(MutableBuffer) There's still so much code around this and I'm wondering if we should generate most of it instead. Possible nice little project.
2020-01-11 11:47:47 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
RefPtr<Custody> cwd;
RefPtr<Custody> root;
{
ScopedSpinLock lock(g_processes_lock);
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
if (auto parent = Process::from_pid(parent_pid)) {
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
cwd = parent->m_cwd;
root = parent->m_root_directory;
Kernel: Retry mmap if MAP_FIXED is not in flags and addr is not 0 If an mmap fails to allocate a region, but the addr passed in was non-zero, non-fixed mmaps should attempt to allocate at any available virtual address.
2019-12-29 05:54:10 +00:00
}
Kernel: Start implementing purgeable memory support It's now possible to get purgeable memory by using mmap(MAP_PURGEABLE). Purgeable memory has a "volatile" flag that can be set using madvise(): - madvise(..., MADV_SET_VOLATILE) - madvise(..., MADV_SET_NONVOLATILE) When in the "volatile" state, the kernel may take away the underlying physical memory pages at any time, without notifying the owner. This gives you a guilt discount when caching very large things. :^) Setting a purgeable region to non-volatile will return whether or not the memory has been taken away by the kernel while being volatile. Basically, if madvise(..., MADV_SET_NONVOLATILE) returns 1, that means the memory was purged while volatile, and whatever was in that piece of memory needs to be reconstructed before use.
2019-12-09 18:12:38 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (!cwd)
cwd = VFS::the().root_custody();
Kernel: Reject non-user address ranges in mmap/munmap/mprotect/madvise There's no valid reason to allow non-userspace address ranges in these system calls.
2020-01-30 20:46:45 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (!root)
root = VFS::the().root_custody();
Kernel: Disallow empty ranges in munmap/mprotect/madvise
2020-01-30 20:55:49 +00:00
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
auto process = adopt(*new Process(first_thread, parts.take_last(), uid, gid, parent_pid, Ring3, move(cwd), nullptr, tty));
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
process->m_fds.resize(m_max_open_file_descriptors);
auto& device_to_use_as_tty = tty ? (CharacterDevice&)*tty : NullDevice::the();
auto description = device_to_use_as_tty.open(O_RDWR).value();
process->m_fds[0].set(*description);
process->m_fds[1].set(*description);
process->m_fds[2].set(*description);
Kernel: Reject non-user address ranges in mmap/munmap/mprotect/madvise There's no valid reason to allow non-userspace address ranges in these system calls.
2020-01-30 20:46:45 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
error = process->exec(path, move(arguments), move(environment));
if (error != 0) {
dbg() << "Failed to exec " << path << ": " << error;
delete first_thread;
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
return {};
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
{
ScopedSpinLock lock(g_processes_lock);
g_processes->prepend(process);
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
process->ref();
Kernel: Support partial munmap() You can now munmap() a part of a region. The kernel will then create one or two new regions around the "hole" and re-map them using the same physical pages as before. This goes towards fixing #175, but not all the way since we don't yet do munmap() across multiple mappings.
2019-08-29 18:57:02 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
error = 0;
return process;
Add simplified mmap() and munmap() syscalls.
2018-10-24 07:48:24 +00:00
}
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
NonnullRefPtr<Process> Process::create_kernel_process(Thread*& first_thread, String&& name, void (*e)(), u32 affinity)
Kernel+LibC+crash: Add mprotect() syscall This patch adds the mprotect() syscall to allow changing the protection flags for memory regions. We don't do any region splitting/merging yet, so this only works on whole mmap() regions. Added a "crash -r" flag to verify that we crash when you attempt to write to read-only memory. :^)
2019-08-12 17:33:24 +00:00
{
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
auto process = adopt(*new Process(first_thread, move(name), (uid_t)0, (gid_t)0, (pid_t)0, Ring0));
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
first_thread->tss().eip = (FlatPtr)e;
Kernel: sys$mprotect protects sub-regions as well as whole ones Split a region into two/three if the desired mprotect range is a strict subset of an existing region. We can then set the access bits on a new region that is just our desired range and add both the new desired subregion and the leftovers back to our page tables.
2019-12-30 20:11:25 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (process->pid() != 0) {
ScopedSpinLock lock(g_processes_lock);
g_processes->prepend(process);
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
process->ref();
Kernel: sys$mprotect protects sub-regions as well as whole ones Split a region into two/three if the desired mprotect range is a strict subset of an existing region. We can then set the access bits on a new region that is just our desired range and add both the new desired subregion and the leftovers back to our page tables.
2019-12-30 20:11:25 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
first_thread->set_affinity(affinity);
first_thread->set_state(Thread::State::Runnable);
return process;
}
Kernel: sys$mprotect protects sub-regions as well as whole ones Split a region into two/three if the desired mprotect range is a strict subset of an existing region. We can then set the access bits on a new region that is just our desired range and add both the new desired subregion and the leftovers back to our page tables.
2019-12-30 20:11:25 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
Process::Process(Thread*& first_thread, const String& name, uid_t uid, gid_t gid, pid_t ppid, RingLevel ring, RefPtr<Custody> cwd, RefPtr<Custody> executable, TTY* tty, Process* fork_parent)
: m_name(move(name))
, m_pid(allocate_pid())
, m_euid(uid)
, m_egid(gid)
, m_uid(uid)
, m_gid(gid)
, m_suid(uid)
, m_sgid(gid)
, m_ring(ring)
, m_executable(move(executable))
, m_cwd(move(cwd))
, m_tty(tty)
, m_ppid(ppid)
{
#ifdef PROCESS_DEBUG
dbg() << "Created new process " << m_name << "(" << m_pid << ")";
#endif
Kernel: sys$mprotect protects sub-regions as well as whole ones Split a region into two/three if the desired mprotect range is a strict subset of an existing region. We can then set the access bits on a new region that is just our desired range and add both the new desired subregion and the leftovers back to our page tables.
2019-12-30 20:11:25 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
m_page_directory = PageDirectory::create_for_userspace(*this, fork_parent ? &fork_parent->page_directory().range_allocator() : nullptr);
#ifdef MM_DEBUG
dbg() << "Process " << pid() << " ctor: PD=" << m_page_directory.ptr() << " created";
#endif
Kernel: sys$mprotect protects sub-regions as well as whole ones Split a region into two/three if the desired mprotect range is a strict subset of an existing region. We can then set the access bits on a new region that is just our desired range and add both the new desired subregion and the leftovers back to our page tables.
2019-12-30 20:11:25 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (fork_parent) {
// NOTE: fork() doesn't clone all threads; the thread that called fork() becomes the only thread in the new process.
first_thread = Thread::current()->clone(*this);
} else {
// NOTE: This non-forked code path is only taken when the kernel creates a process "manually" (at boot.)
first_thread = new Thread(*this);
Kernel: sys$mprotect protects sub-regions as well as whole ones Split a region into two/three if the desired mprotect range is a strict subset of an existing region. We can then set the access bits on a new region that is just our desired range and add both the new desired subregion and the leftovers back to our page tables.
2019-12-30 20:11:25 +00:00
}
Kernel+LibC+crash: Add mprotect() syscall This patch adds the mprotect() syscall to allow changing the protection flags for memory regions. We don't do any region splitting/merging yet, so this only works on whole mmap() regions. Added a "crash -r" flag to verify that we crash when you attempt to write to read-only memory. :^)
2019-08-12 17:33:24 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
Process::~Process()
Kernel: Start implementing purgeable memory support It's now possible to get purgeable memory by using mmap(MAP_PURGEABLE). Purgeable memory has a "volatile" flag that can be set using madvise(): - madvise(..., MADV_SET_VOLATILE) - madvise(..., MADV_SET_NONVOLATILE) When in the "volatile" state, the kernel may take away the underlying physical memory pages at any time, without notifying the owner. This gives you a guilt discount when caching very large things. :^) Setting a purgeable region to non-volatile will return whether or not the memory has been taken away by the kernel while being volatile. Basically, if madvise(..., MADV_SET_NONVOLATILE) returns 1, that means the memory was purged while volatile, and whatever was in that piece of memory needs to be reconstructed before use.
2019-12-09 18:12:38 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
ASSERT(thread_count() == 0);
}
Kernel: Reject non-user address ranges in mmap/munmap/mprotect/madvise There's no valid reason to allow non-userspace address ranges in these system calls.
2020-01-30 20:46:45 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void Process::dump_regions()
{
klog() << "Process regions:";
klog() << "BEGIN END SIZE ACCESS NAME";
for (auto& region : m_regions) {
klog() << String::format("%08x", region.vaddr().get()) << " -- " << String::format("%08x", region.vaddr().offset(region.size() - 1).get()) << " " << String::format("%08x", region.size()) << " " << (region.is_readable() ? 'R' : ' ') << (region.is_writable() ? 'W' : ' ') << (region.is_executable() ? 'X' : ' ') << (region.is_shared() ? 'S' : ' ') << (region.is_stack() ? 'T' : ' ') << (region.vmobject().is_purgeable() ? 'P' : ' ') << " " << region.name().characters();
Kernel: Add MADV_GET_VOLATILE for checking the volatile flag Sometimes you might want to know if a purgeable region is volatile.
2019-12-18 19:48:24 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
MM.dump_kernel_regions();
Kernel: Start implementing purgeable memory support It's now possible to get purgeable memory by using mmap(MAP_PURGEABLE). Purgeable memory has a "volatile" flag that can be set using madvise(): - madvise(..., MADV_SET_VOLATILE) - madvise(..., MADV_SET_NONVOLATILE) When in the "volatile" state, the kernel may take away the underlying physical memory pages at any time, without notifying the owner. This gives you a guilt discount when caching very large things. :^) Setting a purgeable region to non-volatile will return whether or not the memory has been taken away by the kernel while being volatile. Basically, if madvise(..., MADV_SET_NONVOLATILE) returns 1, that means the memory was purged while volatile, and whatever was in that piece of memory needs to be reconstructed before use.
2019-12-09 18:12:38 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void signal_trampoline_dummy(void)
Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO This patch adds the minherit() syscall originally invented by OpenBSD. Only the MAP_INHERIT_ZERO mode is supported for now. If set on an mmap region, that region will be zeroed out on fork().
2020-04-12 18:22:26 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
// The trampoline preserves the current eax, pushes the signal code and
// then calls the signal handler. We do this because, when interrupting a
// blocking syscall, that syscall may return some special error code in eax;
// This error code would likely be overwritten by the signal handler, so it's
// neccessary to preserve it here.
asm(
".intel_syntax noprefix\n"
"asm_signal_trampoline:\n"
"push ebp\n"
"mov ebp, esp\n"
"push eax\n" // we have to store eax 'cause it might be the return value from a syscall
"sub esp, 4\n" // align the stack to 16 bytes
"mov eax, [ebp+12]\n" // push the signal code
"push eax\n"
"call [ebp+8]\n" // call the signal handler
"add esp, 8\n"
"mov eax, %P0\n"
"int 0x82\n" // sigreturn syscall
"asm_signal_trampoline_end:\n"
".att_syntax" ::"i"(Syscall::SC_sigreturn));
}
Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO This patch adds the minherit() syscall originally invented by OpenBSD. Only the MAP_INHERIT_ZERO mode is supported for now. If set on an mmap region, that region will be zeroed out on fork().
2020-04-12 18:22:26 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
extern "C" void asm_signal_trampoline(void);
extern "C" void asm_signal_trampoline_end(void);
Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO This patch adds the minherit() syscall originally invented by OpenBSD. Only the MAP_INHERIT_ZERO mode is supported for now. If set on an mmap region, that region will be zeroed out on fork().
2020-04-12 18:22:26 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void create_signal_trampolines()
{
InterruptDisabler disabler;
// NOTE: We leak this region.
auto* trampoline_region = MM.allocate_user_accessible_kernel_region(PAGE_SIZE, "Signal trampolines", Region::Access::Read | Region::Access::Write | Region::Access::Execute, false).leak_ptr();
g_return_to_ring3_from_signal_trampoline = trampoline_region->vaddr();
Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO This patch adds the minherit() syscall originally invented by OpenBSD. Only the MAP_INHERIT_ZERO mode is supported for now. If set on an mmap region, that region will be zeroed out on fork().
2020-04-12 18:22:26 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
u8* trampoline = (u8*)asm_signal_trampoline;
u8* trampoline_end = (u8*)asm_signal_trampoline_end;
size_t trampoline_size = trampoline_end - trampoline;
Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO This patch adds the minherit() syscall originally invented by OpenBSD. Only the MAP_INHERIT_ZERO mode is supported for now. If set on an mmap region, that region will be zeroed out on fork().
2020-04-12 18:22:26 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
{
SmapDisabler disabler;
u8* code_ptr = (u8*)trampoline_region->vaddr().as_ptr();
memcpy(code_ptr, trampoline, trampoline_size);
Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO This patch adds the minherit() syscall originally invented by OpenBSD. Only the MAP_INHERIT_ZERO mode is supported for now. If set on an mmap region, that region will be zeroed out on fork().
2020-04-12 18:22:26 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
trampoline_region->set_writable(false);
trampoline_region->remap();
Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO This patch adds the minherit() syscall originally invented by OpenBSD. Only the MAP_INHERIT_ZERO mode is supported for now. If set on an mmap region, that region will be zeroed out on fork().
2020-04-12 18:22:26 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void Process::crash(int signal, u32 eip, bool out_of_memory)
Kernel: Start implementing purgeable memory support It's now possible to get purgeable memory by using mmap(MAP_PURGEABLE). Purgeable memory has a "volatile" flag that can be set using madvise(): - madvise(..., MADV_SET_VOLATILE) - madvise(..., MADV_SET_NONVOLATILE) When in the "volatile" state, the kernel may take away the underlying physical memory pages at any time, without notifying the owner. This gives you a guilt discount when caching very large things. :^) Setting a purgeable region to non-volatile will return whether or not the memory has been taken away by the kernel while being volatile. Basically, if madvise(..., MADV_SET_NONVOLATILE) returns 1, that means the memory was purged while volatile, and whatever was in that piece of memory needs to be reconstructed before use.
2019-12-09 18:12:38 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
ASSERT_INTERRUPTS_DISABLED();
ASSERT(!is_dead());
ASSERT(Process::current() == this);
if (out_of_memory) {
dbg() << "\033[31;1mOut of memory\033[m, killing: " << *this;
} else {
if (eip >= 0xc0000000 && g_kernel_symbols_available) {
auto* symbol = symbolicate_kernel_address(eip);
dbg() << "\033[31;1m" << String::format("%p", eip) << " " << (symbol ? demangle(symbol->name) : "(k?)") << " +" << (symbol ? eip - symbol->address : 0) << "\033[0m\n";
} else if (auto elf_bundle = this->elf_bundle()) {
dbg() << "\033[31;1m" << String::format("%p", eip) << " " << elf_bundle->elf_loader->symbolicate(eip) << "\033[0m\n";
} else {
dbg() << "\033[31;1m" << String::format("%p", eip) << " (?)\033[0m\n";
Kernel: Add a mode flag to sys$purge and allow purging clean inodes
2019-12-29 12:16:53 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
dump_backtrace();
Kernel: Start implementing purgeable memory support It's now possible to get purgeable memory by using mmap(MAP_PURGEABLE). Purgeable memory has a "volatile" flag that can be set using madvise(): - madvise(..., MADV_SET_VOLATILE) - madvise(..., MADV_SET_NONVOLATILE) When in the "volatile" state, the kernel may take away the underlying physical memory pages at any time, without notifying the owner. This gives you a guilt discount when caching very large things. :^) Setting a purgeable region to non-volatile will return whether or not the memory has been taken away by the kernel while being volatile. Basically, if madvise(..., MADV_SET_NONVOLATILE) returns 1, that means the memory was purged while volatile, and whatever was in that piece of memory needs to be reconstructed before use.
2019-12-09 18:12:38 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
m_termination_signal = signal;
dump_regions();
ASSERT(is_ring3());
die();
// We can not return from here, as there is nowhere
// to unwind to, so die right away.
Thread::current()->die_if_needed();
ASSERT_NOT_REACHED();
Kernel: Start implementing purgeable memory support It's now possible to get purgeable memory by using mmap(MAP_PURGEABLE). Purgeable memory has a "volatile" flag that can be set using madvise(): - madvise(..., MADV_SET_VOLATILE) - madvise(..., MADV_SET_NONVOLATILE) When in the "volatile" state, the kernel may take away the underlying physical memory pages at any time, without notifying the owner. This gives you a guilt discount when caching very large things. :^) Setting a purgeable region to non-volatile will return whether or not the memory has been taken away by the kernel while being volatile. Basically, if madvise(..., MADV_SET_NONVOLATILE) returns 1, that means the memory was purged while volatile, and whatever was in that piece of memory needs to be reconstructed before use.
2019-12-09 18:12:38 +00:00
}
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
RefPtr<Process> Process::from_pid(pid_t pid)
Add sys$gethostname and /bin/hostname
2018-10-26 07:54:29 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
ScopedSpinLock lock(g_processes_lock);
for (auto& process : *g_processes) {
if (process.pid() == pid)
return &process;
}
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
return {};
Add sys$gethostname and /bin/hostname
2018-10-26 07:54:29 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
RefPtr<FileDescription> Process::file_description(int fd) const
Kernel: Added the ability to set the hostname via new syscall Userland/hostname: Now takes parameter to set the hostname LibC/unistd: Added sethostname function
2020-04-26 05:59:47 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (fd < 0)
return nullptr;
if (static_cast<size_t>(fd) < m_fds.size())
Kernel: Turn Process::FileDescriptionAndFlags into a proper class
2020-07-30 21:50:31 +00:00
return m_fds[fd].description();
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return nullptr;
Kernel: Added the ability to set the hostname via new syscall Userland/hostname: Now takes parameter to set the hostname LibC/unistd: Added sethostname function
2020-04-26 05:59:47 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
int Process::fd_flags(int fd) const
Implement fork()! This is quite cool! The syscall entry point plumbs the register dump down to sys$fork(), which uses it to set up the child process's TSS in order to resume execution right after the int 0x80 fork() call. :^) This works pretty well, although there is some problem with the kernel alias mappings used to clone the parent process's regions. If I disable the MM::release_page_directory() code, there's no problem. Probably there's a premature freeing of a physical page somehow.
2018-11-02 19:41:58 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (fd < 0)
return -1;
if (static_cast<size_t>(fd) < m_fds.size())
Kernel: Turn Process::FileDescriptionAndFlags into a proper class
2020-07-30 21:50:31 +00:00
return m_fds[fd].flags();
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return -1;
}
Some improvements to signals. - Add sigprocmask() and sigpending(). - Forked children inherit signal dispositions and masks. - Exec clears signal dispositions and masks.
2018-11-10 22:29:07 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
String Process::validate_and_copy_string_from_user(const char* user_characters, size_t user_length) const
Kernel+LibC: Add exit_thread() syscall.
2019-04-29 13:17:20 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (user_length == 0)
return String::empty();
if (!user_characters)
return {};
if (!validate_read(user_characters, user_length))
return {};
SmapDisabler disabler;
size_t measured_length = strnlen(user_characters, user_length);
return String(user_characters, measured_length);
Kernel+LibC: Add exit_thread() syscall.
2019-04-29 13:17:20 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
String Process::validate_and_copy_string_from_user(const Syscall::StringArgument& string) const
Kernel+LibPthread: Implement pthread_detach()
2019-12-07 13:47:00 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return validate_and_copy_string_from_user(string.characters, string.length);
Kernel+LibPthread: Implement pthread_detach()
2019-12-07 13:47:00 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
int Process::number_of_open_file_descriptors() const
Kernel+LibPthread: Implement pthread_join() It's now possible to block until another thread in the same process has exited. We can also retrieve its exit value, which is whatever value it passed to pthread_exit(). :^)
2019-11-14 19:58:23 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
int count = 0;
for (auto& description : m_fds) {
if (description)
++count;
Kernel: Fix kernel null deref on process crash during join_thread() The join_thread() syscall is not supposed to be interruptible by signals, but it was. And since the process death mechanism piggybacked on signal interrupts, it was possible to interrupt a pthread_join() by killing the process that was doing it, leading to confusing due to some assumptions being made by Thread::finalize() for threads that have a pending joiner. This patch fixes the issue by making "interrupted by death" a distinct block result separate from "interrupted by signal". Then we handle that state in join_thread() and tidy things up so that thread finalization doesn't get confused by the pending joiner being gone. Test: Tests/Kernel/null-deref-crash-during-pthread_join.cpp
2020-01-10 18:15:01 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return count;
Kernel: More work towards POSIX SHM, also add ftruncate().
2019-04-08 23:10:00 +00:00
}
Kernel: Add a systrace() syscall and implement /bin/strace using it. Calling systrace(pid) gives you a file descriptor with a stream of the syscalls made by a peer process. The process must be owned by the same UID who calls systrace(). :^)
2019-04-22 16:44:45 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
int Process::alloc_fd(int first_candidate_fd)
Kernel: Add a mechanism for listening for changes to an inode. The syscall is quite simple: int watch_file(const char* path, int path_length); It returns a file descriptor referring to a "InodeWatcher" object in the kernel. It becomes readable whenever something changes about the inode. Currently this is implemented by hooking the "metadata dirty bit" in Inode which isn't perfect, but it's a start. :^)
2019-07-22 18:01:11 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
for (int i = first_candidate_fd; i < (int)m_max_open_file_descriptors; ++i) {
if (!m_fds[i])
return i;
}
return -EMFILE;
Kernel: Add a mechanism for listening for changes to an inode. The syscall is quite simple: int watch_file(const char* path, int path_length); It returns a file descriptor referring to a "InodeWatcher" object in the kernel. It becomes readable whenever something changes about the inode. Currently this is implemented by hooking the "metadata dirty bit" in Inode which isn't perfect, but it's a start. :^)
2019-07-22 18:01:11 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
timeval kgettimeofday()
Kernel: Only allow superuser to halt() the system (#342) Following the discussion in #334, shutdown must also have root-only run permissions.
2019-07-19 11:08:26 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return g_timeofday;
Kernel: Only allow superuser to halt() the system (#342) Following the discussion in #334, shutdown must also have root-only run permissions.
2019-07-19 11:08:26 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void kgettimeofday(timeval& tv)
Kernel+Userland: Addd reboot syscall (#334) Rolling with the theme of adding a dialog to shutdown the machine, it is probably nice to have a way to reboot the machine without performing a full system powerdown. A reboot program has been added to `/bin/` as well as a corresponding `syscall` (SC_reboot). This syscall works by attempting to pulse the 8042 keyboard controller. Note that this is NOT supported on new machines, and should only be a fallback until we have proper ACPI support. The implementation causes a triple fault in QEMU, which then restarts the system. The filesystems are locked and synchronized before this occurs, so there shouldn't be any corruption etctera.
2019-07-19 07:58:12 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
tv = kgettimeofday();
Kernel+Userland: Addd reboot syscall (#334) Rolling with the theme of adding a dialog to shutdown the machine, it is probably nice to have a way to reboot the machine without performing a full system powerdown. A reboot program has been added to `/bin/` as well as a corresponding `syscall` (SC_reboot). This syscall works by attempting to pulse the 8042 keyboard controller. Note that this is NOT supported on new machines, and should only be a fallback until we have proper ACPI support. The implementation causes a triple fault in QEMU, which then restarts the system. The filesystems are locked and synchronized before this occurs, so there shouldn't be any corruption etctera.
2019-07-19 07:58:12 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
siginfo_t Process::reap(Process& process)
Kernel: mount system call (#396) It is now possible to mount ext2 `DiskDevice` devices under Serenity on any folder in the root filesystem. Currently any user can do this with any permissions. There's a fair amount of assumptions made here too, that might not be too good, but can be worked on in the future. This is a good start to allow more dynamic operation under the OS itself. It is also currently impossible to unmount and such, and devices will fail to mount in Linux as the FS 'needs to be cleaned'. I'll work on getting `umount` done ASAP to rectify this (as well as working on less assumption-making in the mount syscall. We don't want to just be able to mount DiskDevices!). This could probably be fixed with some `-t` flag or something similar.
2019-08-02 13:18:47 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
siginfo_t siginfo;
memset(&siginfo, 0, sizeof(siginfo));
siginfo.si_signo = SIGCHLD;
siginfo.si_pid = process.pid();
siginfo.si_uid = process.uid();
Kernel+Userland: Support remounting filesystems :^) This makes it possible to change flags of a mount after the fact, with the caveats outlined in the man page.
2020-05-28 18:12:13 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (process.m_termination_signal) {
siginfo.si_status = process.m_termination_signal;
siginfo.si_code = CLD_KILLED;
} else {
siginfo.si_status = process.m_termination_status;
siginfo.si_code = CLD_EXITED;
Kernel: Implement bind mounts You can now bind-mount files and directories. This essentially exposes an existing part of the file system in another place, and can be used as an alternative to symlinks or hardlinks. Here's an example of doing this: # mkdir /tmp/foo # mount /home/anon/myfile.txt /tmp/foo -o bind # cat /tmp/foo This is anon's file.
2020-01-11 16:08:35 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
ASSERT(g_processes_lock.is_locked());
Kernel: Misc tweaks
2020-05-28 15:46:16 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (process.ppid()) {
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
auto parent = Process::from_pid(process.ppid());
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (parent) {
parent->m_ticks_in_user_for_dead_children += process.m_ticks_in_user + process.m_ticks_in_user_for_dead_children;
parent->m_ticks_in_kernel_for_dead_children += process.m_ticks_in_kernel + process.m_ticks_in_kernel_for_dead_children;
Kernel+LibC+Userland: Support mounting other kinds of filesystems
2019-08-15 16:13:56 +00:00
}
Kernel: mount system call (#396) It is now possible to mount ext2 `DiskDevice` devices under Serenity on any folder in the root filesystem. Currently any user can do this with any permissions. There's a fair amount of assumptions made here too, that might not be too good, but can be worked on in the future. This is a good start to allow more dynamic operation under the OS itself. It is also currently impossible to unmount and such, and devices will fail to mount in Linux as the FS 'needs to be cleaned'. I'll work on getting `umount` done ASAP to rectify this (as well as working on less assumption-making in the mount syscall. We don't want to just be able to mount DiskDevices!). This could probably be fixed with some `-t` flag or something similar.
2019-08-02 13:18:47 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
#ifdef PROCESS_DEBUG
dbg() << "Reaping process " << process;
#endif
ASSERT(process.is_dead());
g_processes->remove(&process);
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
process.unref();
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return siginfo;
Kernel: Dump backtrace to debugger for DefaultSignalAction::DumpCore. This makes assertion failures generate backtraces again. Sorry to everyone who suffered from the lack of backtraces lately. :^) We share code with the /proc/PID/stack implementation. You can now get the current backtrace for a Thread via Thread::backtrace(), and all the traces for a Process via Process::backtrace().
2019-07-25 19:02:19 +00:00
}
Kernel+ProcessManager: Let processes have an icon and show it in the table. Processes can now have an icon assigned, which is essentially a 16x16 RGBA32 bitmap exposed as a shared buffer ID. You set the icon ID by calling set_process_icon(int) and the icon ID will be exposed through /proc/all. To make this work, I added a mechanism for making shared buffers globally accessible. For safety reasons, each app seals the icon buffer before making it global. Right now the first call to GWindow::set_icon() is what determines the process icon. We'll probably change this in the future. :^)
2019-07-29 05:26:01 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
bool Process::validate_read_from_kernel(VirtualAddress vaddr, size_t size) const
Kernel+ProcessManager: Let processes have an icon and show it in the table. Processes can now have an icon assigned, which is essentially a 16x16 RGBA32 bitmap exposed as a shared buffer ID. You set the icon ID by calling set_process_icon(int) and the icon ID will be exposed through /proc/all. To make this work, I added a mechanism for making shared buffers globally accessible. For safety reasons, each app seals the icon buffer before making it global. Right now the first call to GWindow::set_icon() is what determines the process icon. We'll probably change this in the future. :^)
2019-07-29 05:26:01 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (vaddr.is_null())
return false;
return MM.validate_kernel_read(*this, vaddr, size);
Kernel+ProcessManager: Let processes have an icon and show it in the table. Processes can now have an icon assigned, which is essentially a 16x16 RGBA32 bitmap exposed as a shared buffer ID. You set the icon ID by calling set_process_icon(int) and the icon ID will be exposed through /proc/all. To make this work, I added a mechanism for making shared buffers globally accessible. For safety reasons, each app seals the icon buffer before making it global. Right now the first call to GWindow::set_icon() is what determines the process icon. We'll probably change this in the future. :^)
2019-07-29 05:26:01 +00:00
}
Kernel+LibC: Add get_process_name() syscall It does exactly what it sounds like: int get_process_name(char* buffer, int buffer_size);
2019-08-15 18:55:10 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
bool Process::validate_read(const void* address, size_t size) const
Kernel+LibC: Add get_process_name() syscall It does exactly what it sounds like: int get_process_name(char* buffer, int buffer_size);
2019-08-15 18:55:10 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (!size)
return false;
return MM.validate_user_read(*this, VirtualAddress(address), size);
Kernel+LibC: Add get_process_name() syscall It does exactly what it sounds like: int get_process_name(char* buffer, int buffer_size);
2019-08-15 18:55:10 +00:00
}
Kernel: Add a Linux-style getrandom syscall The way it gets the entropy and blasts it to the buffer is pretty ugly IMHO, but it does work for now. (It should be replaced, by not truncating a u32.) It implements an (unused for now) flags argument, like Linux but instead of OpenBSD's. This is in case we want to distinguish between entropy sources or any other reason and have to implement a new syscall later. Of course, learn from Linux's struggles with entropy sourcing too.
2019-10-13 14:41:55 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
bool Process::validate_write(void* address, size_t size) const
Kernel+LibC: Add sys$set_process_name() for changing the process name
2020-07-27 16:42:10 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (!size)
return false;
return MM.validate_user_write(*this, VirtualAddress(address), size);
Kernel+LibC: Add sys$set_process_name() for changing the process name
2020-07-27 16:42:10 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
Custody& Process::current_directory()
Kernel: Add a Linux-style getrandom syscall The way it gets the entropy and blasts it to the buffer is pretty ugly IMHO, but it does work for now. (It should be replaced, by not truncating a u32.) It implements an (unused for now) flags argument, like Linux but instead of OpenBSD's. This is in case we want to distinguish between entropy sources or any other reason and have to implement a new syscall later. Of course, learn from Linux's struggles with entropy sourcing too.
2019-10-13 14:41:55 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (!m_cwd)
m_cwd = VFS::the().root_custody();
return *m_cwd;
Kernel: Add a Linux-style getrandom syscall The way it gets the entropy and blasts it to the buffer is pretty ugly IMHO, but it does work for now. (It should be replaced, by not truncating a u32.) It implements an (unused for now) flags argument, like Linux but instead of OpenBSD's. This is in case we want to distinguish between entropy sources or any other reason and have to implement a new syscall later. Of course, learn from Linux's struggles with entropy sourcing too.
2019-10-13 14:41:55 +00:00
}
Kernel+LibC: Implement clock_gettime() and clock_nanosleep() Only the CLOCK_MONOTONIC clock is supported at the moment, and it only has millisecond precision. :^)
2019-11-02 18:34:06 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
KResultOr<String> Process::get_syscall_path_argument(const char* user_path, size_t path_length) const
Kernel: Implement the setkeymap() syscall.
2019-11-23 07:48:07 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (path_length == 0)
return KResult(-EINVAL);
if (path_length > PATH_MAX)
return KResult(-ENAMETOOLONG);
if (!validate_read(user_path, path_length))
return KResult(-EFAULT);
return copy_string_from_user(user_path, path_length);
Kernel: Implement the setkeymap() syscall.
2019-11-23 07:48:07 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
KResultOr<String> Process::get_syscall_path_argument(const Syscall::StringArgument& path) const
Kernel+LibC: Implement clock_gettime() and clock_nanosleep() Only the CLOCK_MONOTONIC clock is supported at the moment, and it only has millisecond precision. :^)
2019-11-02 18:34:06 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return get_syscall_path_argument(path.characters, path.length);
Kernel+LibC: Implement clock_gettime() and clock_nanosleep() Only the CLOCK_MONOTONIC clock is supported at the moment, and it only has millisecond precision. :^)
2019-11-02 18:34:06 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void Process::finalize()
Kernel: Add new syscall to allow changing the system date
2020-03-12 23:17:14 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
ASSERT(Thread::current() == g_finalizer);
#ifdef PROCESS_DEBUG
dbg() << "Finalizing process " << *this;
#endif
Kernel: Add new syscall to allow changing the system date
2020-03-12 23:17:14 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
if (m_perf_event_buffer) {
auto description_or_error = VFS::the().open(String::format("perfcore.%d", m_pid), O_CREAT | O_EXCL, 0400, current_directory(), UidAndGid { m_uid, m_gid });
if (!description_or_error.is_error()) {
auto& description = description_or_error.value();
auto json = m_perf_event_buffer->to_json(m_pid, m_executable ? m_executable->absolute_path() : "");
description->write(json.data(), json.size());
}
Kernel: Add new syscall to allow changing the system date
2020-03-12 23:17:14 +00:00
}
Kernel+LibC: Implement clock_gettime() and clock_nanosleep() Only the CLOCK_MONOTONIC clock is supported at the moment, and it only has millisecond precision. :^)
2019-11-02 18:34:06 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
m_fds.clear();
m_tty = nullptr;
m_executable = nullptr;
m_cwd = nullptr;
m_root_directory = nullptr;
m_root_directory_relative_to_global_root = nullptr;
Kernel: Fix race in clock_nanosleep This is a complete fix of clock_nanosleep, because the thread holds the process lock again when returning from sleep()/sleep_until(). Therefore, no further concurrent invalidation can occur.
2020-03-03 04:12:39 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
disown_all_shared_buffers();
{
InterruptDisabler disabler;
if (auto* parent_thread = Thread::from_tid(m_ppid)) {
if (parent_thread->m_signal_action_data[SIGCHLD].flags & SA_NOCLDWAIT) {
// NOTE: If the parent doesn't care about this process, let it go.
m_ppid = 0;
} else {
parent_thread->send_signal(SIGCHLD, this);
Kernel+LibC: Implement clock_gettime() and clock_nanosleep() Only the CLOCK_MONOTONIC clock is supported at the moment, and it only has millisecond precision. :^)
2019-11-02 18:34:06 +00:00
}
}
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
Kernel: Fix some crashes due to missing locks We need to hold m_lock when accessing m_regions.
2020-08-01 20:41:54 +00:00
{
ScopedSpinLock lock(m_lock);
m_regions.clear();
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
m_dead = true;
Kernel+LibC: Implement clock_gettime() and clock_nanosleep() Only the CLOCK_MONOTONIC clock is supported at the moment, and it only has millisecond precision. :^)
2019-11-02 18:34:06 +00:00
}
Kernel: Use a lookup table for syscalls Instead of the big ugly switch statement, build a lookup table using the syscall enumeration macro. This greatly simplifies the syscall implementation. :^)
2019-11-09 21:18:16 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void Process::die()
Kernel: Use a lookup table for syscalls Instead of the big ugly switch statement, build a lookup table using the syscall enumeration macro. This greatly simplifies the syscall implementation. :^)
2019-11-09 21:18:16 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
// Let go of the TTY, otherwise a slave PTY may keep the master PTY from
// getting an EOF when the last process using the slave PTY dies.
// If the master PTY owner relies on an EOF to know when to wait() on a
// slave owner, we have to allow the PTY pair to be torn down.
m_tty = nullptr;
kill_all_threads();
Kernel: Use a lookup table for syscalls Instead of the big ugly switch statement, build a lookup table using the syscall enumeration macro. This greatly simplifies the syscall implementation. :^)
2019-11-09 21:18:16 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t Process::amount_dirty_private() const
Kernel: Use a lookup table for syscalls Instead of the big ugly switch statement, build a lookup table using the syscall enumeration macro. This greatly simplifies the syscall implementation. :^)
2019-11-09 21:18:16 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
// FIXME: This gets a bit more complicated for Regions sharing the same underlying VMObject.
// The main issue I'm thinking of is when the VMObject has physical pages that none of the Regions are mapping.
// That's probably a situation that needs to be looked at in general.
size_t amount = 0;
Kernel: Fix some crashes due to missing locks We need to hold m_lock when accessing m_regions.
2020-08-01 20:41:54 +00:00
ScopedSpinLock lock(m_lock);
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
for (auto& region : m_regions) {
if (!region.is_shared())
amount += region.amount_dirty();
}
return amount;
Kernel: Use a lookup table for syscalls Instead of the big ugly switch statement, build a lookup table using the syscall enumeration macro. This greatly simplifies the syscall implementation. :^)
2019-11-09 21:18:16 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t Process::amount_clean_inode() const
Kernel: Use a lookup table for syscalls Instead of the big ugly switch statement, build a lookup table using the syscall enumeration macro. This greatly simplifies the syscall implementation. :^)
2019-11-09 21:18:16 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
HashTable<const InodeVMObject*> vmobjects;
Kernel: Fix some crashes due to missing locks We need to hold m_lock when accessing m_regions.
2020-08-01 20:41:54 +00:00
{
ScopedSpinLock lock(m_lock);
for (auto& region : m_regions) {
if (region.vmobject().is_inode())
vmobjects.set(&static_cast<const InodeVMObject&>(region.vmobject()));
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
}
size_t amount = 0;
for (auto& vmobject : vmobjects)
amount += vmobject->amount_clean();
return amount;
Kernel: Use a lookup table for syscalls Instead of the big ugly switch statement, build a lookup table using the syscall enumeration macro. This greatly simplifies the syscall implementation. :^)
2019-11-09 21:18:16 +00:00
}
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t Process::amount_virtual() const
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t amount = 0;
Kernel: Fix some crashes due to missing locks We need to hold m_lock when accessing m_regions.
2020-08-01 20:41:54 +00:00
ScopedSpinLock lock(m_lock);
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
for (auto& region : m_regions) {
amount += region.size();
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return amount;
}
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t Process::amount_resident() const
{
// FIXME: This will double count if multiple regions use the same physical page.
size_t amount = 0;
Kernel: Fix some crashes due to missing locks We need to hold m_lock when accessing m_regions.
2020-08-01 20:41:54 +00:00
ScopedSpinLock lock(m_lock);
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
for (auto& region : m_regions) {
amount += region.amount_resident();
Kernel: Disallow loading a module twice without explicitly unloading it This ensures that a module has the chance to run its cleanup functions before it's taken out of service.
2019-12-24 00:40:26 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return amount;
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t Process::amount_shared() const
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
// FIXME: This will double count if multiple regions use the same physical page.
// FIXME: It doesn't work at the moment, since it relies on PhysicalPage ref counts,
// and each PhysicalPage is only reffed by its VMObject. This needs to be refactored
// so that every Region contributes +1 ref to each of its PhysicalPages.
size_t amount = 0;
Kernel: Fix some crashes due to missing locks We need to hold m_lock when accessing m_regions.
2020-08-01 20:41:54 +00:00
ScopedSpinLock lock(m_lock);
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
for (auto& region : m_regions) {
amount += region.amount_shared();
}
return amount;
Kernel: Implement very simple kernel module loading It's now possible to load a .o file into the kernel via a syscall. The kernel will perform all the necessary ELF relocations, and then call the "module_init" symbol in the loaded module.
2019-11-28 19:59:11 +00:00
}
Kernel: Implement a simple process time profiler The kernel now supports basic profiling of all the threads in a process by calling profiling_enable(pid_t). You finish the profiling by calling profiling_disable(pid_t). This all works by recording thread stacks when the timer interrupt fires and the current thread is in a process being profiled. Note that symbolication is deferred until profiling_disable() to avoid adding more noise than necessary to the profile. A simple "/bin/profile" command is included here that can be used to start/stop profiling like so: $ profile 10 on ... wait ... $ profile 10 off After a profile has been recorded, it can be fetched in /proc/profile There are various limits (or "bugs") on this mechanism at the moment: - Only one process can be profiled at a time. - We allocate 8MB for the samples, if you use more space, things will not work, and probably break a bit. - Things will probably fall apart if the profiled process dies during profiling, or while extracing /proc/profile
2019-12-11 19:36:56 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t Process::amount_purgeable_volatile() const
Kernel: Implement a simple process time profiler The kernel now supports basic profiling of all the threads in a process by calling profiling_enable(pid_t). You finish the profiling by calling profiling_disable(pid_t). This all works by recording thread stacks when the timer interrupt fires and the current thread is in a process being profiled. Note that symbolication is deferred until profiling_disable() to avoid adding more noise than necessary to the profile. A simple "/bin/profile" command is included here that can be used to start/stop profiling like so: $ profile 10 on ... wait ... $ profile 10 off After a profile has been recorded, it can be fetched in /proc/profile There are various limits (or "bugs") on this mechanism at the moment: - Only one process can be profiled at a time. - We allocate 8MB for the samples, if you use more space, things will not work, and probably break a bit. - Things will probably fall apart if the profiled process dies during profiling, or while extracing /proc/profile
2019-12-11 19:36:56 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t amount = 0;
Kernel: Fix some crashes due to missing locks We need to hold m_lock when accessing m_regions.
2020-08-01 20:41:54 +00:00
ScopedSpinLock lock(m_lock);
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
for (auto& region : m_regions) {
if (region.vmobject().is_purgeable() && static_cast<const PurgeableVMObject&>(region.vmobject()).is_volatile())
amount += region.amount_resident();
}
return amount;
Kernel: Implement a simple process time profiler The kernel now supports basic profiling of all the threads in a process by calling profiling_enable(pid_t). You finish the profiling by calling profiling_disable(pid_t). This all works by recording thread stacks when the timer interrupt fires and the current thread is in a process being profiled. Note that symbolication is deferred until profiling_disable() to avoid adding more noise than necessary to the profile. A simple "/bin/profile" command is included here that can be used to start/stop profiling like so: $ profile 10 on ... wait ... $ profile 10 off After a profile has been recorded, it can be fetched in /proc/profile There are various limits (or "bugs") on this mechanism at the moment: - Only one process can be profiled at a time. - We allocate 8MB for the samples, if you use more space, things will not work, and probably break a bit. - Things will probably fall apart if the profiled process dies during profiling, or while extracing /proc/profile
2019-12-11 19:36:56 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t Process::amount_purgeable_nonvolatile() const
Kernel: Implement a simple process time profiler The kernel now supports basic profiling of all the threads in a process by calling profiling_enable(pid_t). You finish the profiling by calling profiling_disable(pid_t). This all works by recording thread stacks when the timer interrupt fires and the current thread is in a process being profiled. Note that symbolication is deferred until profiling_disable() to avoid adding more noise than necessary to the profile. A simple "/bin/profile" command is included here that can be used to start/stop profiling like so: $ profile 10 on ... wait ... $ profile 10 off After a profile has been recorded, it can be fetched in /proc/profile There are various limits (or "bugs") on this mechanism at the moment: - Only one process can be profiled at a time. - We allocate 8MB for the samples, if you use more space, things will not work, and probably break a bit. - Things will probably fall apart if the profiled process dies during profiling, or while extracing /proc/profile
2019-12-11 19:36:56 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
size_t amount = 0;
Kernel: Fix some crashes due to missing locks We need to hold m_lock when accessing m_regions.
2020-08-01 20:41:54 +00:00
ScopedSpinLock lock(m_lock);
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
for (auto& region : m_regions) {
if (region.vmobject().is_purgeable() && !static_cast<const PurgeableVMObject&>(region.vmobject()).is_volatile())
amount += region.amount_resident();
}
return amount;
Kernel: Implement a simple process time profiler The kernel now supports basic profiling of all the threads in a process by calling profiling_enable(pid_t). You finish the profiling by calling profiling_disable(pid_t). This all works by recording thread stacks when the timer interrupt fires and the current thread is in a process being profiled. Note that symbolication is deferred until profiling_disable() to avoid adding more noise than necessary to the profile. A simple "/bin/profile" command is included here that can be used to start/stop profiling like so: $ profile 10 on ... wait ... $ profile 10 off After a profile has been recorded, it can be fetched in /proc/profile There are various limits (or "bugs") on this mechanism at the moment: - Only one process can be profiled at a time. - We allocate 8MB for the samples, if you use more space, things will not work, and probably break a bit. - Things will probably fall apart if the profiled process dies during profiling, or while extracing /proc/profile
2019-12-11 19:36:56 +00:00
}
Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() This patch adds a single "kernel info page" that is mappable read-only by any process and contains the current time of day. This is then used to implement a version of gettimeofday() that doesn't have to make a syscall. To protect against race condition issues, the info page also has a serial number which is incremented whenever the kernel updates the contents of the page. Make sure to verify that the serial number is the same before and after reading the information you want from the page.
2019-12-15 20:29:26 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void Process::terminate_due_to_signal(u8 signal)
Kernel+LibPthread+LibC: Add a naive futex and use it for pthread_cond_t This patch implements a simple version of the futex (fast userspace mutex) API in the kernel and uses it to make the pthread_cond_t API's block instead of busily sched_yield(). An arbitrary userspace address is passed to the kernel as a "token" that identifies the futex and you can then FUTEX_WAIT and FUTEX_WAKE that specific userspace address. FUTEX_WAIT corresponds to pthread_cond_wait() and FUTEX_WAKE is used for pthread_cond_signal() and pthread_cond_broadcast(). I'm pretty sure I'm missing something in this implementation, but it's hopefully okay for a start. :^)
2019-12-22 20:29:47 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
ASSERT_INTERRUPTS_DISABLED();
ASSERT(signal < 32);
Kernel: Fix signal delivery when no syscall is made This fixes a regression introduced by the new software context switching where the Kernel would not deliver a signal unless the process is making system calls. This is because the TSS no longer updates the CS value, so the scheduler never considered delivery as the process always appeared to be in kernel mode. With software context switching we can just set up the signal trampoline at any time and when the processor returns back to user mode it'll get executed. This should fix e.g. killing programs that are stuck in some tight loop that doesn't make any system calls and is only pre-empted by the timer interrupt. Fixes #2958
2020-08-02 18:08:22 +00:00
dbg() << "Terminating " << *this << " due to signal " << signal;
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
m_termination_status = 0;
m_termination_signal = signal;
die();
Kernel+LibPthread+LibC: Add a naive futex and use it for pthread_cond_t This patch implements a simple version of the futex (fast userspace mutex) API in the kernel and uses it to make the pthread_cond_t API's block instead of busily sched_yield(). An arbitrary userspace address is passed to the kernel as a "token" that identifies the futex and you can then FUTEX_WAIT and FUTEX_WAKE that specific userspace address. FUTEX_WAIT corresponds to pthread_cond_wait() and FUTEX_WAKE is used for pthread_cond_signal() and pthread_cond_broadcast(). I'm pretty sure I'm missing something in this implementation, but it's hopefully okay for a start. :^)
2019-12-22 20:29:47 +00:00
}
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
KResult Process::send_signal(u8 signal, Process* sender)
Kernel+LibPthread+LibC: Add a naive futex and use it for pthread_cond_t This patch implements a simple version of the futex (fast userspace mutex) API in the kernel and uses it to make the pthread_cond_t API's block instead of busily sched_yield(). An arbitrary userspace address is passed to the kernel as a "token" that identifies the futex and you can then FUTEX_WAIT and FUTEX_WAKE that specific userspace address. FUTEX_WAIT corresponds to pthread_cond_wait() and FUTEX_WAKE is used for pthread_cond_signal() and pthread_cond_broadcast(). I'm pretty sure I'm missing something in this implementation, but it's hopefully okay for a start. :^)
2019-12-22 20:29:47 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
InterruptDisabler disabler;
if (auto* thread = Thread::from_tid(m_pid)) {
thread->send_signal(signal, sender);
return KSuccess;
}
return KResult(-ESRCH);
}
Kernel+LibPthread+LibC: Add a naive futex and use it for pthread_cond_t This patch implements a simple version of the futex (fast userspace mutex) API in the kernel and uses it to make the pthread_cond_t API's block instead of busily sched_yield(). An arbitrary userspace address is passed to the kernel as a "token" that identifies the futex and you can then FUTEX_WAIT and FUTEX_WAKE that specific userspace address. FUTEX_WAIT corresponds to pthread_cond_wait() and FUTEX_WAKE is used for pthread_cond_signal() and pthread_cond_broadcast(). I'm pretty sure I'm missing something in this implementation, but it's hopefully okay for a start. :^)
2019-12-22 20:29:47 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
Thread* Process::create_kernel_thread(void (*entry)(), u32 priority, const String& name, u32 affinity, bool joinable)
{
ASSERT((priority >= THREAD_PRIORITY_MIN) && (priority <= THREAD_PRIORITY_MAX));
Kernel: Enable timeout support for sys$futex(FUTEX_WAIT) Utilize the new Thread::wait_on timeout parameter to implement timeout support for FUTEX_WAIT. As we compute the relative time from the user specified absolute time, we try to delay that computation as long as possible before we call into Thread::wait_on(..). To enable this a small bit of refactoring was done pull futex_queue fetching out and timeout fetch and calculation separation.
2020-04-26 09:40:24 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
// FIXME: Do something with guard pages?
Kernel: Enable timeout support for sys$futex(FUTEX_WAIT) Utilize the new Thread::wait_on timeout parameter to implement timeout support for FUTEX_WAIT. As we compute the relative time from the user specified absolute time, we try to delay that computation as long as possible before we call into Thread::wait_on(..). To enable this a small bit of refactoring was done pull futex_queue fetching out and timeout fetch and calculation separation.
2020-04-26 09:40:24 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
auto* thread = new Thread(*this);
Kernel: Enable timeout support for sys$futex(FUTEX_WAIT) Utilize the new Thread::wait_on timeout parameter to implement timeout support for FUTEX_WAIT. As we compute the relative time from the user specified absolute time, we try to delay that computation as long as possible before we call into Thread::wait_on(..). To enable this a small bit of refactoring was done pull futex_queue fetching out and timeout fetch and calculation separation.
2020-04-26 09:40:24 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
thread->set_name(name);
thread->set_affinity(affinity);
thread->set_priority(priority);
thread->set_joinable(joinable);
Kernel: Enable timeout support for sys$futex(FUTEX_WAIT) Utilize the new Thread::wait_on timeout parameter to implement timeout support for FUTEX_WAIT. As we compute the relative time from the user specified absolute time, we try to delay that computation as long as possible before we call into Thread::wait_on(..). To enable this a small bit of refactoring was done pull futex_queue fetching out and timeout fetch and calculation separation.
2020-04-26 09:40:24 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
auto& tss = thread->tss();
tss.eip = (FlatPtr)entry;
Kernel+LibPthread+LibC: Add a naive futex and use it for pthread_cond_t This patch implements a simple version of the futex (fast userspace mutex) API in the kernel and uses it to make the pthread_cond_t API's block instead of busily sched_yield(). An arbitrary userspace address is passed to the kernel as a "token" that identifies the futex and you can then FUTEX_WAIT and FUTEX_WAKE that specific userspace address. FUTEX_WAIT corresponds to pthread_cond_wait() and FUTEX_WAKE is used for pthread_cond_signal() and pthread_cond_broadcast(). I'm pretty sure I'm missing something in this implementation, but it's hopefully okay for a start. :^)
2019-12-22 20:29:47 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
thread->set_state(Thread::State::Runnable);
return thread;
Kernel+LibPthread+LibC: Add a naive futex and use it for pthread_cond_t This patch implements a simple version of the futex (fast userspace mutex) API in the kernel and uses it to make the pthread_cond_t API's block instead of busily sched_yield(). An arbitrary userspace address is passed to the kernel as a "token" that identifies the futex and you can then FUTEX_WAIT and FUTEX_WAKE that specific userspace address. FUTEX_WAIT corresponds to pthread_cond_wait() and FUTEX_WAKE is used for pthread_cond_signal() and pthread_cond_broadcast(). I'm pretty sure I'm missing something in this implementation, but it's hopefully okay for a start. :^)
2019-12-22 20:29:47 +00:00
}
Kernel: Add a basic thread boosting mechanism This patch introduces a syscall: int set_thread_boost(int tid, int amount) You can use this to add a permanent boost value to the effective thread priority of any thread with your UID (or any thread in the system if you are the superuser.) This is quite crude, but opens up some interesting opportunities. :^)
2019-12-30 18:23:13 +00:00
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
void Process::FileDescriptionAndFlags::clear()
Kernel: Add a basic thread boosting mechanism This patch introduces a syscall: int set_thread_boost(int tid, int amount) You can use this to add a permanent boost value to the effective thread priority of any thread with your UID (or any thread in the system if you are the superuser.) This is quite crude, but opens up some interesting opportunities. :^)
2019-12-30 18:23:13 +00:00
{
Kernel: Turn Process::FileDescriptionAndFlags into a proper class
2020-07-30 21:50:31 +00:00
m_description = nullptr;
m_flags = 0;
Kernel: Add a basic thread boosting mechanism This patch introduces a syscall: int set_thread_boost(int tid, int amount) You can use this to add a permanent boost value to the effective thread priority of any thread with your UID (or any thread in the system if you are the superuser.) This is quite crude, but opens up some interesting opportunities. :^)
2019-12-30 18:23:13 +00:00
}
Kernel: Also add a process boosting mechanism Let's also have set_process_boost() for giving all threads in a process the same boost.
2019-12-30 19:10:00 +00:00
Kernel: Turn Process::FileDescriptionAndFlags into a proper class
2020-07-30 21:50:31 +00:00
void Process::FileDescriptionAndFlags::set(NonnullRefPtr<FileDescription>&& description, u32 flags)
Kernel: Also add a process boosting mechanism Let's also have set_process_boost() for giving all threads in a process the same boost.
2019-12-30 19:10:00 +00:00
{
Kernel: Turn Process::FileDescriptionAndFlags into a proper class
2020-07-30 21:50:31 +00:00
m_description = move(description);
m_flags = flags;
Kernel: Also add a process boosting mechanism Let's also have set_process_boost() for giving all threads in a process the same boost.
2019-12-30 19:10:00 +00:00
}
Kernel: Add a basic chroot() syscall :^) The chroot() syscall now allows the superuser to isolate a process into a specific subtree of the filesystem. This is not strictly permanent, as it is also possible for a superuser to break *out* of a chroot, but it is a useful mechanism for isolating unprivileged processes. The VFS now uses the current process's root_directory() as the root for path resolution purposes. The root directory is stored as an uncached Custody in the Process object.
2020-01-10 22:14:04 +00:00
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
KBuffer Process::backtrace() const
Kernel: Add a basic chroot() syscall :^) The chroot() syscall now allows the superuser to isolate a process into a specific subtree of the filesystem. This is not strictly permanent, as it is also possible for a superuser to break *out* of a chroot, but it is a useful mechanism for isolating unprivileged processes. The VFS now uses the current process's root_directory() as the root for path resolution purposes. The root directory is stored as an uncached Custody in the Process object.
2020-01-10 22:14:04 +00:00
{
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
KBufferBuilder builder;
for_each_thread([&](Thread& thread) {
builder.appendf("Thread %d (%s):\n", thread.tid(), thread.name().characters());
Kernel: Remove ProcessInspectionHandle and make Process RefCounted By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
2020-08-02 02:04:56 +00:00
builder.append(thread.backtrace());
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-30 21:38:15 +00:00
return IterationDecision::Continue;
});
return builder.build();
Kernel: Add a basic chroot() syscall :^) The chroot() syscall now allows the superuser to isolate a process into a specific subtree of the filesystem. This is not strictly permanent, as it is also possible for a superuser to break *out* of a chroot, but it is a useful mechanism for isolating unprivileged processes. The VFS now uses the current process's root_directory() as the root for path resolution purposes. The root directory is stored as an uncached Custody in the Process object.
2020-01-10 22:14:04 +00:00
}
Custody& Process::root_directory()
{
if (!m_root_directory)
m_root_directory = VFS::the().root_custody();
return *m_root_directory;
}
Kernel: Don't forget to copy & destroy root_directory_for_procfs Also, rename it to root_directory_relative_to_global_root.
2020-01-12 18:42:01 +00:00
Custody& Process::root_directory_relative_to_global_root()
Kernel: Expose a process's filesystem root as a /proc/PID/root symlink In order to preserve the absolute path of the process root, we save the custody used by chroot() before stripping it to become the new "/". There's probably a better way to do this.
2020-01-10 22:48:44 +00:00
{
Kernel: Don't forget to copy & destroy root_directory_for_procfs Also, rename it to root_directory_relative_to_global_root.
2020-01-12 18:42:01 +00:00
if (!m_root_directory_relative_to_global_root)
m_root_directory_relative_to_global_root = root_directory();
return *m_root_directory_relative_to_global_root;
Kernel: Expose a process's filesystem root as a /proc/PID/root symlink In order to preserve the absolute path of the process root, we save the custody used by chroot() before stripping it to become the new "/". There's probably a better way to do this.
2020-01-10 22:48:44 +00:00
}
Kernel: Add a basic chroot() syscall :^) The chroot() syscall now allows the superuser to isolate a process into a specific subtree of the filesystem. This is not strictly permanent, as it is also possible for a superuser to break *out* of a chroot, but it is a useful mechanism for isolating unprivileged processes. The VFS now uses the current process's root_directory() as the root for path resolution purposes. The root directory is stored as an uncached Custody in the Process object.
2020-01-10 22:14:04 +00:00
void Process::set_root_directory(const Custody& root)
{
m_root_directory = root;
}
ping: Use pledge()
2020-01-11 19:48:43 +00:00
Kernel: Add a Process::add_region() helper This is a private helper for adding a Region to Process::m_regions. It's just for convenience since it's a bit cumbersome to do this.
2020-01-19 15:25:38 +00:00
Region& Process::add_region(NonnullOwnPtr<Region> region)
{
auto* ptr = region.ptr();
Kernel: Turn Thread::current and Process::current into functions This allows us to query the current thread and process on a per processor basis
2020-06-28 21:34:31 +00:00
ScopedSpinLock lock(m_lock);
Kernel: Add a Process::add_region() helper This is a private helper for adding a Region to Process::m_regions. It's just for convenience since it's a bit cumbersome to do this.
2020-01-19 15:25:38 +00:00
m_regions.append(move(region));
return *ptr;
}
Kernel: Add a basic implementation of unveil() This syscall is a complement to pledge() and adds the same sort of incremental relinquishing of capabilities for filesystem access. The first call to unveil() will "drop a veil" on the process, and from now on, only unveiled parts of the filesystem are visible to it. Each call to unveil() specifies a path to either a directory or a file along with permissions for that path. The permissions are a combination of the following: - r: Read access (like the "rpath" promise) - w: Write access (like the "wpath" promise) - x: Execute access - c: Create/remove access (like the "cpath" promise) Attempts to open a path that has not been unveiled with fail with ENOENT. If the unveiled path lacks sufficient permissions, it will fail with EACCES. Like pledge(), subsequent calls to unveil() with the same path can only remove permissions, not add them. Once you call unveil(nullptr, nullptr), the veil is locked, and it's no longer possible to unveil any more paths for the process, ever. This concept comes from OpenBSD, and their implementation does various things differently, I'm sure. This is just a first implementation for SerenityOS, and we'll keep improving on it as we go. :^)
2020-01-20 21:12:04 +00:00
Kernel: Reduce header dependencies of Process and Thread
2020-02-16 01:01:42 +00:00
void Process::set_tty(TTY* tty)
{
m_tty = tty;
}
Kernel: Load executables on demand when symbolicating Previously we would map the entire executable of a program in its own address space (but make it unavailable to userspace code.) This patch removes that and changes the symbolication code to remap the executable on demand (and into the kernel's own address space instead of the process address space.) This opens up a couple of further simplifications that will follow.
2020-03-02 09:40:40 +00:00
OwnPtr<Process::ELFBundle> Process::elf_bundle() const
{
if (!m_executable)
return nullptr;
auto bundle = make<ELFBundle>();
ptrace: Add PT_SETREGS PT_SETTREGS sets the regsiters of the traced thread. It can only be used when the tracee is stopped. Also, refactor ptrace. The implementation was getting long and cluttered the alraedy large Process.cpp file. This commit moves the bulk of the implementation to Kernel/Ptrace.cpp, and factors out peek & poke to separate methods of the Process class.
2020-04-07 15:23:37 +00:00
if (!m_executable->inode().shared_vmobject()) {
return nullptr;
}
Kernel: Load executables on demand when symbolicating Previously we would map the entire executable of a program in its own address space (but make it unavailable to userspace code.) This patch removes that and changes the symbolication code to remap the executable on demand (and into the kernel's own address space instead of the process address space.) This opens up a couple of further simplifications that will follow.
2020-03-02 09:40:40 +00:00
ASSERT(m_executable->inode().shared_vmobject());
auto& vmobject = *m_executable->inode().shared_vmobject();
bundle->region = MM.allocate_kernel_region_with_vmobject(const_cast<SharedInodeVMObject&>(vmobject), vmobject.size(), "ELF bundle", Region::Access::Read);
if (!bundle->region)
return nullptr;
LibELF: Make ELF::Loader RefCounted
2020-04-17 11:40:38 +00:00
bundle->elf_loader = ELF::Loader::create(bundle->region->vaddr().as_ptr(), bundle->region->size());
Kernel: Load executables on demand when symbolicating Previously we would map the entire executable of a program in its own address space (but make it unavailable to userspace code.) This patch removes that and changes the symbolication code to remap the executable on demand (and into the kernel's own address space instead of the process address space.) This opens up a couple of further simplifications that will follow.
2020-03-02 09:40:40 +00:00
return bundle;
}
Kernel: Move all code into the Kernel namespace
2020-02-16 00:27:42 +00:00
}
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