linux: improve FUSE support

This fixes a number of AppImages; tested with
scribus-1.5.6.1-linux-x86_64.AppImage.

Reported By: @probonopd
Reviewed By: asomers, emaste
Sponsored By: EPSRC
Differentia

linux: improve FUSE support

This fixes a number of AppImages; tested with
scribus-1.5.6.1-linux-x86_64.AppImage.

Reported By: @probonopd
Reviewed By: asomers, emaste
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D30606

(cherry picked from commit 128a1db806daac088a79314cee060b8a204e8481)

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linux: support AT_EMPTY_PATH flag in fchownat(2)

This fixes rsyslog package installation scripts in Bionic.

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

linux: support AT_EMPTY_PATH flag in fchownat(2)

This fixes rsyslog package installation scripts in Bionic.

Reviewed By: kib
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D29108

(cherry picked from commit e47823b8312b7cb61c5c8cb8e1eb981994e3a0b4)

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linux: implement O_PATH

Reviewed By: kib
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D29773

(cherry picked from commit 1663120ae452fe3783c74ce40522caf0e2327608)

linux: remove spurious newline.

Sponsored by: The FreeBSD Foundation

linux(4): Implement name_to_handle_at(), open_by_handle_at()

They are similar to our getfhat(2) and fhopen(2) syscalls.

Differential Revision: https://reviews.freebsd.org/D27111

Make it possible to mount a fuse filesystem, such as squashfuse,
from a Linux binary. Should come handy for AppImages.

Reviewed by: asomers
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
D

Make it possible to mount a fuse filesystem, such as squashfuse,
from a Linux binary. Should come handy for AppImages.

Reviewed by: asomers
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26959

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linux: silence renameat2 flags warning

Hogs the console while building the Linux kernel in a Ubuntu Focal jail.

linux: add missing conversions for compat.linux.use_emul_path handling

compat: clean up empty lines in .c and .h files

linux: add sysctl compat.linux.use_emul_path

This is a step towards facilitating jails with only Linux binaries.
Supporting emul_path adds path lookups which are completely spurious
if the binary at

linux: add sysctl compat.linux.use_emul_path

This is a step towards facilitating jails with only Linux binaries.
Supporting emul_path adds path lookups which are completely spurious
if the binary at hand runs in a Linux-based root directory.

It defaults to on (== current behavior).

make -C /root/linux-5.3-rc8 -s -j 1 bzImage:

use_emul_path=1: 101.65s user 68.68s system 100% cpu 2:49.62 total
use_emul_path=0: 101.41s user 64.32s system 100% cpu 2:45.02 total

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Make linux fallocate(2) return EOPNOTSUPP, not ENOSYS, on unsupported mode,
as documented in the man page.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Add a trivial linux(4) splice(2) implementation, which simply
returns EINVAL. Fixes grep (grep-3.1-2build1).

PR: kern/218699
Reported by: avos
Reviewed by: emaste
MFC after: 2 weeks
Sponsored by:

Add a trivial linux(4) splice(2) implementation, which simply
returns EINVAL. Fixes grep (grep-3.1-2build1).

PR: kern/218699
Reported by: avos
Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25636

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memfd_create: turn on SHM_GROW_ON_WRITE

memfd_create fds will no longer require an ftruncate(2) to set the size;
they'll grow (to the extent that it's possible) upon write(2)-like syscalls.

Reviewe

memfd_create: turn on SHM_GROW_ON_WRITE

memfd_create fds will no longer require an ftruncate(2) to set the size;
they'll grow (to the extent that it's possible) upon write(2)-like syscalls.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D25502

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linuxolator: implement memfd_create syscall

This effectively mirrors our libc implementation, but with minor fudging --
name needs to be copied in from userspace, so we just copy it straight into
st

linuxolator: implement memfd_create syscall

This effectively mirrors our libc implementation, but with minor fudging --
name needs to be copied in from userspace, so we just copy it straight into
stack-allocated memfd_name into the correct position rather than allocating
memory that needs to be cleaned up.

The sealing-related fcntl(2) commands, F_GET_SEALS and F_ADD_SEALS, have
also been implemented now that we support them.

Note that this implementation is still not quite at feature parity w.r.t.
the actual Linux version; some caveats, from my foggy memory:

- Need to implement SHM_GROW_ON_WRITE, default for memfd (in progress)
- LTP wants the memfd name exposed to fdescfs
- Linux allows open() of an fdescfs fd with O_TRUNC to truncate after dup.
(?)

Interested parties can install and run LTP from ports (devel/linux-ltp) to
confirm any fixes.

PR: 240874
Reviewed by: kib, trasz
Differential Revision: https://reviews.freebsd.org/D21845

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Make linux(4) warn about unsupported fcntls.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25231

Replace LINUX_FASYNC with LINUX_O_ASYNC; no functional changes.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25218

Add kern_unmount() and use in Linuxulator. No functional changes.

Reviewed by: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22646

Fix 64-bit syscall argument fetching in 32-bit Linux syscall handlers.

The Linux32 system call argument fetcher places each argument (passed in
registers in the Linux x86 system call convention) int

Fix 64-bit syscall argument fetching in 32-bit Linux syscall handlers.

The Linux32 system call argument fetcher places each argument (passed in
registers in the Linux x86 system call convention) into an entry in the
generic system call args array. Each member of this array is 8 bytes
wide, so this approach is broken for system calls that take off_t
arguments.

Fix the problem by splitting l_loff_t arguments in the 32-bit system
call descriptions, the same as we do for FreeBSD32. Change entry points
to handle this using the PAIR32TO64 macro.

Move linux_ftruncate64() into compat/linux.

PR: 243155
Reported by: Alex S <[email protected]>
Reviewed by: kib (previous version)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23210

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Properly translate MNT_FORCE flag to Linux umount2(2). Previously
it worked by accident.

MFC after: 2 weeks
Sponsored by: DARPA

linux(4): implement copy_file_range(2)

copy_file_range(2) is implemented natively since r350315, make it available
for Linux binaries too.

Reviewed by: kib (mentor), trasz (previous version)
Approv

linux(4): implement copy_file_range(2)

copy_file_range(2) is implemented natively since r350315, make it available
for Linux binaries too.

Reviewed by: kib (mentor), trasz (previous version)
Approved by: kib (mentor)
Differential Revision: https://reviews.freebsd.org/D22959

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Make linux mount(2) tolerate NULL 'from' argument, and fix flag
handling.

This should unbreak access04, acct01, chmod06, creat06,
and fchmod06 LTP tests.

MFC after: 2 weeks
Sponsored by: The FreeBS

Make linux mount(2) tolerate NULL 'from' argument, and fix flag
handling.

This should unbreak access04, acct01, chmod06, creat06,
and fchmod06 LTP tests.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

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Don't use K&R definitions. No functional changes.

Reported by: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Add sync_file_range(2) implementation to linux(4); it's a thin wrapper
over the usual fsync(2).

This silences some warnings when running "apt-get upgrade".

Reviewed by: brooks, emaste
MFC after: 2

Add sync_file_range(2) implementation to linux(4); it's a thin wrapper
over the usual fsync(2).

This silences some warnings when running "apt-get upgrade".

Reviewed by: brooks, emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22371

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linux: avoid overhead of P_CONTROLT checks if possible

Sponsored by: The FreeBSD Foundation

Make linux(4) open(2)/openat(2) return ELOOP instead of EMLINK,
when being passed O_NOFOLLOW. This fixes LTP testcase openat02:5.

Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Fo

Make linux(4) open(2)/openat(2) return ELOOP instead of EMLINK,
when being passed O_NOFOLLOW. This fixes LTP testcase openat02:5.

Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D22384

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