linux: Add support for kcmp(2) system call

Signed-off-by: Ricardo Branco <rbranco@suse.de>
Reviewed by: kib
Pull Request: https://github.com/freebsd/freebsd-src/pull/1920

sys: Add AT_HWCAP3 and AT_HWCAP4

It is likely we will need these on arm64. Add them in preparation for
flags in these to be added at some point in the future.

Reviewed by: brooks, imp, kib
Sponsore

sys: Add AT_HWCAP3 and AT_HWCAP4

It is likely we will need these on arm64. Add them in preparation for
flags in these to be added at some point in the future.

Reviewed by: brooks, imp, kib
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D51005

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linux: implement PR_CHILD_SET_SUBREAPER

Reviewed by: imp, dchagin
Pull Request: https://github.com/freebsd/freebsd-src/pull/1260

sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

linux(4): Add a dedicated ioprio system calls

On Linux these system calls have an effect only when used in conjuction
with an I/O scheduler that supports I/O priorities. If no I/O scheduler
has been

linux(4): Add a dedicated ioprio system calls

On Linux these system calls have an effect only when used in conjuction
with an I/O scheduler that supports I/O priorities. If no I/O scheduler
has been set for a thread, then by defaut the I/O priority will follow
the CPU nice value. Due to FreeBSD lack of I/O scheduler facilities, the
default Linux behavior is implemented.

Ubuntu 23.04 debootstrap requires Linux ionice which depends on these
syscalls.

Differential Revision: https://reviews.freebsd.org/D41153
MFC after: 1 month

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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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linux(4): Cleanup sys/sysctl.h from linux_misc.h

Leftover after c5156c77 (r374538).

MFC after: 2 weeks

linux(4): Add AT_MINSIGSTKSZ to arm64 port

MFC after: 2 weeks

linprocfs: Add /proc/self/oom_score_adj.

To avoid annoyng messages from LTP test suites add the simple
implementation of /proc/self/oom_score_adj which is do nothing.

Reviewed by: emaste
Different

linprocfs: Add /proc/self/oom_score_adj.

To avoid annoyng messages from LTP test suites add the simple
implementation of /proc/self/oom_score_adj which is do nothing.

Reviewed by: emaste
Differential revision: https://reviews.freebsd.org/D34710
MFC after: 2 weeks

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linux(4): Return ENOSYS for unsupported P_PIDFD waitid idtype.

Reviewed by: emaste
Differential revision: https://reviews.freebsd.org/D31559
MFC after: 2 weeks

linux: Provide dummy seccomp(2)

Don't emit messages; this isn't any different from a Linux kernel
built without OPTIONS_SECCOMP, so the userspace already needs to know
how to deal with it. This is

linux: Provide dummy seccomp(2)

Don't emit messages; this isn't any different from a Linux kernel
built without OPTIONS_SECCOMP, so the userspace already needs to know
how to deal with it. This is also similar with how we handle seccomp
in linux_prctl().

Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D33808

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Revert "linux: Provide dummy seccomp(2)"

This reverts commit 56981629f91fcdd358ccb41081ff6dcc2edac12f.

Wrong patch; fails to build on i386.

linux: Provide dummy seccomp(2)

Don't emit warnings; this isn't any different from a Linux kernel
built without OPTIONS_SECCOMP, so the userspace already needs to know
how to deal with it. This is

linux: Provide dummy seccomp(2)

Don't emit warnings; this isn't any different from a Linux kernel
built without OPTIONS_SECCOMP, so the userspace already needs to know
how to deal with it. This is also similar with how we handle seccomp
in linux_prctl().

Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D33808

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linux: Replace ifdefs in ptrace with per-architecture callbacks

It's a cleanup; no (intended) functional changes.

Sponsored By: EPSRC
Reviewed By: kib
Differential Revision: https://reviews.freebsd

linux: Replace ifdefs in ptrace with per-architecture callbacks

It's a cleanup; no (intended) functional changes.

Sponsored By: EPSRC
Reviewed By: kib
Differential Revision: https://reviews.freebsd.org/D32888

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linux: Add ptrace(2) support on arm64

This moves linux_ptrace.c from sys/amd64/linux/ to sys/compat/linux/,
making it possible to use it on architectures other than amd64.
It also enables Linux ptra

linux: Add ptrace(2) support on arm64

This moves linux_ptrace.c from sys/amd64/linux/ to sys/compat/linux/,
making it possible to use it on architectures other than amd64.
It also enables Linux ptrace(2) on arm64.

Relnotes: yes
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D32868

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linux(4): Implement clone3 system call.

clone3 system call is used by glibc-2.34.

Differential revision: https://reviews.freebsd.org/D31475
MFC after: 2 weeks

linux(4): Add struct clone_args for future clone3 system call.

In preparation for clone3 system call add struct clone_args and use it in
clone implementation.
Move all of clone related bits to the n

linux(4): Add struct clone_args for future clone3 system call.

In preparation for clone3 system call add struct clone_args and use it in
clone implementation.
Move all of clone related bits to the newly created linux_fork.h header.

Differential revision: https://reviews.freebsd.org/D31474
MFC after: 2 weeks

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linux(4): Retire linux_kplatform.

Assuming we can't run on i486, i586 class cpu, retire linux_kplatform var
and use hardcoded 'machine' value in linux_newuname().

I have added linux_kplatform for c

linux(4): Retire linux_kplatform.

Assuming we can't run on i486, i586 class cpu, retire linux_kplatform var
and use hardcoded 'machine' value in linux_newuname().

I have added linux_kplatform for consistency with linux_platform which is
placed in to vdso to avoid excess copyout it on stack for AT_PLATFORM at
exec time.

This is the first stage of Linuxulator's vdso revision.

Reviewed by: trasz, imp
Differential Revision: https://reviews.freebsd.org/D30774
MFC after: 2 weeks

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linux: adjust ordering of Linux auxv and add dummy AT_HWCAP2

This should be a no-op; the purpose of this is to reduce
a spurious difference between Linuxulator and Linux, to make
debugging core dump

linux: adjust ordering of Linux auxv and add dummy AT_HWCAP2

This should be a no-op; the purpose of this is to reduce
a spurious difference between Linuxulator and Linux, to make
debugging core dumps slightly easier.

Note that AT_HWCAP2 we pass to Linux binaries is always 0,
instead of being equal to 'cpu_feature2'. This matches what
I've observed under Ubuntu Focal VM.

Reviewed By: chuck, dchagin
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D29609

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Rename linux_set_upcall_kse() to linux_set_upcall().

This matches the rename of cpu_set_upcall_kse() in
5c2cf818454375536fda522ba83cf67c50929e6b.

Reviewed by: kib, emaste
MFC after: 1 week
Sponsore

Rename linux_set_upcall_kse() to linux_set_upcall().

This matches the rename of cpu_set_upcall_kse() in
5c2cf818454375536fda522ba83cf67c50929e6b.

Reviewed by: kib, emaste
MFC after: 1 week
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D29295

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linux: mute the "unsupported prctl option 23" warnings

Make the PR_CAPBSET_READ prctl(2) return EINVAL without logging
any warnings; this is way too noisy with Focal.

Sponsored by: The FreeBSD Foun

linux: mute the "unsupported prctl option 23" warnings

Make the PR_CAPBSET_READ prctl(2) return EINVAL without logging
any warnings; this is way too noisy with Focal.

Sponsored by: The FreeBSD Foundation

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linux(4) prctl(2): Implement PR_[GS]ET_DUMPABLE

Proxy the flag to the roughly analogous FreeBSD procctl 'TRACE'.

TRACE-disabled processes are not coredumped, and Linux !DUMPABLE processes
can not b

linux(4) prctl(2): Implement PR_[GS]ET_DUMPABLE

Proxy the flag to the roughly analogous FreeBSD procctl 'TRACE'.

TRACE-disabled processes are not coredumped, and Linux !DUMPABLE processes
can not be ptraced. There are some additional semantics around ownership of
files in the /proc/[pid] pseudo-filesystem, which we do not attempt to
emulate correctly at this time.

Reviewed by: markj (earlier version)
Differential Revision: https://reviews.freebsd.org/D27015

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linux(4): Add missing clone(2) flags

Further improve prctl(2) debug.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26916

Improve prctl(2) debug.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26899