Commit graph

31 commits

Author SHA1 Message Date
Andreas Kling
794758df3a Kernel: Implement some basic stack pointer validation
VM regions can now be marked as stack regions, which is then validated
on syscall, and on page fault.

If a thread is caught with its stack pointer pointing into anything
that's *not* a Region with its stack bit set, we'll crash the whole
process with SIGSTKFLT.

Userspace must now allocate custom stacks by using mmap() with the new
MAP_STACK flag. This mechanism was first introduced in OpenBSD, and now
we have it too, yay! :^)
2019-11-17 12:15:43 +01:00
Andreas Kling
18348cebf1 Kernel+LibC: Implement the openat() syscall
POSIX's openat() is very similar to open(), except you also provide a
file descriptor referring to a directory from which relative paths
should be resolved.

Passing it the magical fd number AT_FDCWD means "resolve from current
directory" (which is indeed also what open() normally does.)

This fixes libarchive's bsdtar, since it was trying to do something
extremely wrong in the absence of openat() support. The issue has
recently been fixed upstream in libarchive:

https://github.com/libarchive/libarchive/issues/1239

However, we should have openat() support anyway, so I went ahead and
implemented it. :^)

Fixes #748.
2019-11-10 13:51:27 +01:00
Andreas Kling
cc68654a44 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 19:34:06 +01:00
Andreas Kling
3f2c1a2e3d Kernel: Add SIOCGIFHWADDR ioctl to get the MAC address of an adapter 2019-10-02 18:20:11 +02:00
Andreas Kling
2482fc3538 IPv4: Implement socket ioctls SIOCGIFADDR and SIOCSIFADDR
This allows userspace programs to get and set (superuser-only) the IPv4
address of a network adapter. :^)
2019-09-23 19:06:03 +02:00
Andreas Kling
8cfb859368 IPv4: Support overriding the default TTL (64)
Made getsockopt() and setsockopt() virtual so we can handle them in the
various Socket subclasses. The subclasses map kinda nicely to "levels".

This will allow us to implement things like "traceroute", although..
I spent some time trying to do that, but then hit a wall when it turned
out that the user-mode networking in QEMU doesn't preserve TTL in the
ICMP packets passing through.
2019-09-19 21:42:59 +02:00
Conrad Pankoff
1868523e00 LibC: Move duplicated winsize struct definition into ioctl_numbers.h 2019-08-18 07:40:02 +02:00
Andreas Kling
3073ea7d84 Kernel: Add support for the WSTOPPED flag to the waitpid() syscall.
This makes waitpid() return when a child process is stopped via a signal.
Use this in Shell to catch stopped children and return control to the
command line. :^)

Fixes #298.
2019-07-14 11:35:49 +02:00
Andreas Kling
27f699ef0c AK: Rename the common integer typedefs to make it obvious what they are.
These types can be picked up by including <AK/Types.h>:

* u8, u16, u32, u64 (unsigned)
* i8, i16, i32, i64 (signed)
2019-07-03 21:20:13 +02:00
Robin Burchell
9cd0f6ffac Kernel/LibC: Implement sched_* functionality to set/get process priority
Right now, we allow anything inside a user to raise or lower any other process's
priority. This feels simple enough to me. Linux disallows raising, but
that's annoying in practice.
2019-05-30 02:57:15 +02:00
Robin Burchell
a906098579 Kernel: Fix a bad printf, and stub out SO_ERROR a bit more fully
links requests SO_ERROR, so in not supporting it, things were unhappy.
Supporting this properly looks a little messy. I guess Socket will need
an m_error member it sets everywhere it returns an error. Or Syscall
could set it, perhaps, but I don't know if that's the right thing to
do, so let's just stub this for now and file a bug.
2019-05-30 02:02:30 +02:00
Robin Burchell
0dc9af5f7e Add clang-format file
Also run it across the whole tree to get everything using the One True Style.
We don't yet run this in an automated fashion as it's a little slow, but
there is a snippet to do so in makeall.sh.
2019-05-28 17:31:20 +02:00
Andreas Kling
b3a1671f1a Kernel: Add support for recv() with MSG_DONTWAIT.
Passing this flag to recv() temporarily puts the file descriptor into
non-blocking mode.

Also implement LocalSocket::recv() as a simple forwarding to read().
2019-05-20 03:47:02 +02:00
Andreas Kling
99aead4857 Kernel: Add a writev() syscall for writing multiple buffers in one go.
We then use this immediately in the WindowServer/LibGUI communication in
order to send both message + optional "extra data" with a single syscall.
2019-05-10 03:19:25 +02:00
Andreas Kling
5f63f8120c Kernel: Remove "restorer" field from SignalActionData.
I was originally implementing signals by looking at some man page about
sigaction() to see how it works. It seems like the restorer thingy is
system-specific and not required by POSIX, so let's get rid of it.
2019-04-20 19:32:14 +02:00
Andreas Kling
a58d7fd8bb Kernel: Get rid of Kernel/types.h, separate LinearAddress/PhysicalAddress. 2019-04-06 14:29:29 +02:00
Andreas Kling
58c4d41c5f Kernel: Remove Limits.h 2019-04-03 13:18:42 +02:00
Andreas Kling
b59d588c04 Kernel: Start fleshing out an UDP implementation. 2019-03-13 14:22:27 +01:00
Andreas Kling
562663df7c Add support for socket send/receive timeouts.
Only the receive timeout is hooked up yet. You can change the timeout by
calling setsockopt(..., SOL_SOCKET, SO_RCVTIMEO, ...).

Use this mechanism to make /bin/ping report timeouts.
2019-03-13 13:15:05 +01:00
Andreas Kling
a017a77442 Kernel+LibC+Userland: Start working on an IPv4 socket backend.
The first userland networking program will be "ping" :^)
2019-03-12 15:51:42 +01:00
Andreas Kling
251293f2e1 Kernel: Block a signal from being dispatched again until handler returns.
We don't handle nesting yet, but this is a step in the right direction.
2019-03-05 10:34:08 +01:00
Andreas Kling
a356746d04 Compat work towards porting vim. 2019-02-26 15:57:59 +01:00
Andreas Kling
3f29a12d90 More compat work. Rename libraries from LibFoo.a => libfoo.a
This makes it more straightforward to build a cross-compiler toolchain.
Also move math stuff from LibC to LibM.
2019-02-26 13:30:57 +01:00
Andreas Kling
54b1d6f57f Kernel: More sockets work. Fleshing out accept(). 2019-02-14 15:17:30 +01:00
Andreas Kling
77177dbb76 Kernel: Begin fleshing out bind() syscall. 2019-02-14 14:38:30 +01:00
Andreas Kling
2f35e54f80 Kernel: Begin implementing UNIX domain sockets. 2019-02-14 14:17:38 +01:00
Andreas Kling
27fa09aee4 LibC: Add mktime(). 2019-01-31 16:51:27 +01:00
Andreas Kling
c30e2c8d44 Implement basic chmod() syscall and /bin/chmod helper.
Only raw octal modes are supported right now.
This patch also changes mode_t from 32-bit to 16-bit to match the on-disk
type used by Ext2FS.

I also ran into EPERM being errno=0 which was confusing, so I inserted an
ESUCCESS in its place.
2019-01-29 04:55:08 +01:00
Andreas Kling
2bedabbd6c Stub out poll() syscall and LibC wrapper. 2019-01-23 07:28:25 +01:00
Andreas Kling
8bb18fdc56 Kernel: Get rid of Unix namespace.
This is no longer needed as the Kernel can stand on its own legs now
and there won't be any conflict with host system data types.
2019-01-23 06:57:00 +01:00
Andreas Kling
754037874c Move VFS sources into Kernel/. 2019-01-23 05:14:00 +01:00
Renamed from VirtualFileSystem/UnixTypes.h (Browse further)