linux(4): Remove sys/cdefs.h inclusion where it's not needed due to 685dc743

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

linux(4): Use M_LINUX for malloc type of proc emuldata

MFC after: 2 weeks

linux(4): Use pwd_altroot() to tell namei() about ABI root path

PR: 72920
Differential Revision: https://reviews.freebsd.org/D40090
MFC after: 2 month

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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 includes under compat/linux

Cleanup unneeded includes, sort the rest according to style(9).
No functional changes.

MFC after: 2 weeks

linux(4): Cleanup empty lines.

MFC after: 2 weeks

linux(4): Fix KASSERT message.

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: plug set-but-not-used vars

Sponsored by: Rubicon Communications, LLC ("Netgate")

linux: remove the always curthread argument from lconvpath

linux: plug set-but-not-unused vars

Sponsored by: Rubicon Communications, LLC ("Netgate")

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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Drop "All rights reserved" from my copyright statements.

Add email and fixup years while here.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D30912
MFC after: 2 weeks

epoll: Store epoll_event udata member in ext member of kevent.

Current epoll implementation stores udata fields of epoll_event
structure in special dynamically-sized table rather than in udata field

epoll: Store epoll_event udata member in ext member of kevent.

Current epoll implementation stores udata fields of epoll_event
structure in special dynamically-sized table rather than in udata field
of backing kevent structure because of 2 reasons:
1. Kevent's udata size is smaller than epoll's on 32-bit archs.
2. Kevent's udata can be clobbered on execution EPOLL_CTL_ADD as kqueue
modifies existing event while epoll returns error in this case.

After r320043 has introduced four new 64bit user data members (ext[]),
we can store epoll udata in one of them and drop aforementioned table.
According to kqueue_register() source code ext members are not updated
when existing kevent is modified that fixes p.2.

As a side effect the patch fixes PR/252582.

Reviewed by: trasz
MFC after: 1 month
Differential revision: https://reviews.freebsd.org/D28169

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Linuxolator: Replace use of eventhandlers by sysent hooks.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D27309

Set default stack size for Linux apps to 8MB. This matches Linux'
defaults, makes core files smaller, and fixes applications which use
pthread_join(3) in a wrong way, namely Steam.

This is based on

Set default stack size for Linux apps to 8MB. This matches Linux'
defaults, makes core files smaller, and fixes applications which use
pthread_join(3) in a wrong way, namely Steam.

This is based on a patch submitted by Jason Yang, which I've reworked
to set the limit instead of only changing the value reported (which
is enough to fix the bug for Linux pthreads, but could be confusing).

PR: 248225
Submitted by: Jason_YH_Yang at wistron.com (earlier version)
Analyzed by: Alex S <iwtcex@gmail.com>
Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26778

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Do not leak oldvmspace if image activation failed

and current address space is already destroyed, so kern_execve()
terminates the process.

While there, clean up some internals of post_execve() inli

Do not leak oldvmspace if image activation failed

and current address space is already destroyed, so kern_execve()
terminates the process.

While there, clean up some internals of post_execve() inlined in init_main.

Reported by: Peter <pmc@citylink.dinoex.sub.org>
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D26525

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Fix execution of linux binary from multithreaded non-Linux process.

If multithreaded non-Linux process execs Linux binary, then non-Linux
threads different from the one that execing are cleared by
s

Fix execution of linux binary from multithreaded non-Linux process.

If multithreaded non-Linux process execs Linux binary, then non-Linux
threads different from the one that execing are cleared by
single-threading at boundary, and then terminating them in
post_execve(). Since at that time the process is already switched to
linux ABI, linuxolator is involved in the thread clearing on boundary,
but cannot find the emul data.

Handle it by pre-creating emuldata for all threads in the execing process.

Also remove a code in linux_proc_exec() handler that cleared emul data
for other threads when execing from multithreaded Linux process. It is
excessive.

PR: 247020
Reported by: Martin FIlla <freebsd@sysctl.cz>
Reported by: Henrique L. Amorim, Independent Security Researcher
Reported by: Rodrigo Rubira Branco (BSDaemon), Amazon Web Services
Reviewed by: markj
Tested by: trasz
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D25293

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Make linux(4) set the openfiles soft resource limit to 1024 for Linux
applications, which often depend on this being the case. There's a new
sysctl, compat.linux.default_openfiles, to control this b

Make linux(4) set the openfiles soft resource limit to 1024 for Linux
applications, which often depend on this being the case. There's a new
sysctl, compat.linux.default_openfiles, to control this behaviour.

Reviewed by: kevans, emaste, bcr (manpages)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25177

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MFHead @347527

Sponsored by: The FreeBSD Foundation

Follow the FreeBSD and implement PDEATH_SIG prctl ops in the Linuxulator.
It was first introduced in r163734 and missied by me in r283383.

MFC after: 1 week

linux(4): Remove sys/cdefs.h inclusion where it's not needed due to 685dc743

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

linux(4): Use M_LINUX for malloc type of proc emuldata

MFC after: 2 weeks