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ladybird/Kernel
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Andrew Kaster 7a7e7c82b5 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.
2020-01-13 13:03:30 +01:00
..
ACPI Kernel: Create a basic SMBIOS Decoder 2020-01-02 00:50:09 +01:00
Arch/i386 Kernel: Rename {ss,esp}_if_crossRing to userspace_{ss,esp} 2020-01-09 18:02:01 +01:00
Devices Kernel: Add "video" pledge for accessing framebuffer devices 2020-01-12 02:18:30 +01:00
FileSystem Kernel: read() and write() should EOVERFLOW if (offset+size) overflows 2020-01-12 20:20:17 +01:00
Heap Kernel: Demangle userspace ELF symbols in backtraces 2019-11-27 14:06:24 +01:00
Net IPv4: Require "inet" promise for ioctl() on an IPv4Socket 2020-01-12 13:28:07 +01:00
PCI Kernel: Fixing PCI MMIO access mechanism 2020-01-02 21:45:04 +01:00
TTY Kernel: Require "tty" for ioctl() on TTY and MasterPTY 2020-01-12 13:29:51 +01:00
VM Kernel: Copy Region's "is_mmap" flag when cloning regions for fork() 2020-01-10 19:24:01 +01:00
.bochsrc Meta: Make Serenity run on Bochs once again 2019-08-06 21:09:24 +02:00
.gitignore Meta: Removed all gitignore in the source tree only keeping the root one 2019-06-30 10:41:26 +02:00
Assertions.h Kernel: Move i386.{cpp,h} => Arch/i386/CPU.{cpp,h} 2019-06-07 20:02:01 +02:00
build-gpt-image-grub.sh Build: Fix more bugs in the POSIX sh-ification of scripts 2019-11-03 13:11:43 +01:00
build-image-grub.sh Build: Bump the default disk image size from 500MB to 600MB 2019-11-26 12:54:33 +01:00
build-image-qemu.sh Build: add support for building on OpenBSD 2020-01-02 21:03:53 +01:00
build-root-filesystem.sh Base: Let's make home directories 700 to keep things private :^) 2020-01-09 21:57:52 +01:00
CMOS.cpp AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
CMOS.h AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
Console.cpp Kernel: Make File's can_read/can_write take a const FileDescription& 2019-11-04 14:03:14 +01:00
Console.h Kernel: Make File's can_read/can_write take a const FileDescription& 2019-11-04 14:03:14 +01:00
debug-kernel Debugging: Add kernel debugging support 2020-01-13 11:06:42 +01:00
DoubleBuffer.cpp Revert "Kernel: Make DoubleBuffer use a KBuffer instead of kmalloc()ing" 2019-10-18 15:58:06 +02:00
DoubleBuffer.h Revert "Kernel: Make DoubleBuffer use a KBuffer instead of kmalloc()ing" 2019-10-18 15:58:06 +02:00
FB.h Kernel: Add framebuffer ioctls; wrap raw ioctls with a C API 2019-08-18 07:40:02 +02:00
grub.cfg Kernel: Embrace the SerenityOS name 2019-12-29 19:08:02 +01:00
grub_gpt.cfg Kernel: Embrace the SerenityOS name 2019-12-29 19:08:02 +01:00
init.cpp Kernel: Add a basic chroot() syscall :^) 2020-01-10 23:14:04 +01:00
IO.h Kernel: First cut of a sb16 driver 2019-07-13 08:00:24 +02:00
IRQHandler.cpp Kernel: Move PIC.cpp into Arch/i386/ 2019-07-09 15:04:43 +02:00
IRQHandler.h AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
KBuffer.h Kernel: Make kernel memory regions be non-executable by default 2019-12-25 22:41:34 +01:00
KBufferBuilder.cpp Kernel: Make kernel memory regions be non-executable by default 2019-12-25 22:41:34 +01:00
KBufferBuilder.h AK: Rename <AK/AKString.h> to <AK/String.h> 2019-09-06 15:36:54 +02:00
KernelInfoPage.h Kernel+LibC: Publish a "kernel info page" and use it for gettimeofday() 2019-12-15 21:29:26 +01:00
KeyCode.h Kernel: Implement AltGr key support 2019-12-31 19:31:42 +01:00
KParams.cpp AK: Make HashMap::get(Key) return an Optional<Value>. 2019-07-24 10:25:43 +02:00
KParams.h AK: Rename <AK/AKString.h> to <AK/String.h> 2019-09-06 15:36:54 +02:00
kprintf.cpp Kernel: Demangle userspace ELF symbols in backtraces 2019-11-27 14:06:24 +01:00
KResult.h Kernel: Add KResult::error() to make it look symmetrical with KResultOr 2020-01-06 12:08:27 +01:00
kstdio.h Kernel: Overload dbgputstr for char array literals in C++ 2020-01-13 13:03:30 +01:00
KSyms.cpp Kernel: Start implementing x86 SMAP support 2020-01-05 18:14:51 +01:00
KSyms.h Kernel: Allow modules to link against anything in kernel.map :^) 2019-11-28 21:30:20 +01:00
linker.ld Kernel: Harden memory mapping of the kernel image 2020-01-06 13:55:39 +01:00
Lock.cpp Kernel: Fix Lock racing to the WaitQueue 2020-01-12 19:04:16 +01:00
Lock.h Kernel: Add Lock::is_locked() 2019-12-26 11:43:23 +01:00
makeall.sh Build: Add fast build mode that does not clean everything or run tests 2020-01-09 18:07:21 +01:00
Makefile Debugging: Add kernel debugging support 2020-01-13 11:06:42 +01:00
mkmap.sh Kernel: Allow modules to link against anything in kernel.map :^) 2019-11-28 21:30:20 +01:00
Module.h Kernel: Implement basic module unloading :^) 2019-11-28 21:07:22 +01:00
MousePacket.h AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
Multiboot.h AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
Process.cpp Kernel: Tighten up exec/do_exec and allow for PT_INTERP iterpreters 2020-01-13 13:03:30 +01:00
Process.h Kernel: Tighten up exec/do_exec and allow for PT_INTERP iterpreters 2020-01-13 13:03:30 +01:00
ProcessTracer.cpp AK: Rename the common integer typedefs to make it obvious what they are. 2019-07-03 21:20:13 +02:00
ProcessTracer.h Kernel: Make File's can_read/can_write take a const FileDescription& 2019-11-04 14:03:14 +01:00
Profiling.cpp Kernel: Separate out the symbol offsets in profile output 2019-12-12 21:59:47 +01:00
Profiling.h Kernel: Separate out the symbol offsets in profile output 2019-12-12 21:59:47 +01:00
Random.cpp Kernel: Add a more expressive API for getting random bytes 2020-01-03 12:43:07 +01:00
Random.h Kernel: Add a more expressive API for getting random bytes 2020-01-03 12:43:07 +01:00
RTC.cpp Kernel: Fix BIOS date/time on hardware 2019-09-28 13:59:49 +02:00
RTC.h Add clang-format file 2019-05-28 17:31:20 +02:00
run Kernel: Fixing PCI MMIO access mechanism 2020-01-02 21:45:04 +01:00
Scheduler.cpp Kernel: Dispatch pending signals when returning from a syscall 2020-01-12 15:04:33 +01:00
Scheduler.h Kernel: Switch to eagerly restoring x86 FPU state on context switch 2020-01-01 16:54:21 +01:00
SharedBuffer.cpp Kernel: Rename vmo => vmobject everywhere 2019-12-19 19:15:27 +01:00
SharedBuffer.h Kernel+LibC: Make all SharedBuffers purgeable (default: non-volatile) 2019-12-09 20:06:47 +01:00
StdLib.cpp Kernel: Randomize the stack canary on startup 2020-01-06 13:05:40 +01:00
StdLib.h Kernel: Pass a parameter struct to mknod() 2020-01-11 10:27:37 +01:00
sync.sh Meta: Allow sync.sh to be run from any directory 2020-01-06 10:43:00 +01:00
Syscall.cpp Kernel: Dispatch pending signals when returning from a syscall 2020-01-12 15:04:33 +01:00
Syscall.h ping: Use pledge() 2020-01-11 20:48:43 +01:00
TestModule.cpp Kernel: Have modules export their name in a "module_name" string 2019-11-29 21:31:17 +01:00
Thread.cpp Kernel: Fix Lock racing to the WaitQueue 2020-01-12 19:04:16 +01:00
Thread.h Kernel: Fix Lock racing to the WaitQueue 2020-01-12 19:04:16 +01:00
TimerQueue.cpp Kernel: Add kernel-level timer queue (heavily based on @juliusf's work) 2019-12-27 02:15:45 +01:00
TimerQueue.h Kernel: Add kernel-level timer queue (heavily based on @juliusf's work) 2019-12-27 02:15:45 +01:00
UnixTypes.h Kernel: Add a mode flag to sys$purge and allow purging clean inodes 2019-12-29 13:16:53 +01:00
WaitQueue.cpp Kernel: Fix Lock racing to the WaitQueue 2020-01-12 19:04:16 +01:00
WaitQueue.h Kernel: Fix Lock racing to the WaitQueue 2020-01-12 19:04:16 +01:00