On Tue, 11 Jul 2023 18:16:02 +0200, Alexey Gladkov wrote:

In glibc, the fchmodat(3) function has a flags argument according to the
POSIX specification [1], but kernel syscalls has no such argument.
Therefore, libc implementations do workarounds using /proc. However,
this requires procfs to be mounted and accessible.

This patch set adds fchmodat2(), a new syscall. The syscall allows to
pass the AT_SYMLINK_NOFOLLOW flag to disable LOOKUP_FOLLOW. In all other
respects, this syscall is no different from fchmodat().

[...]

Tools updates usually go separately.
Flags argument ported to unsigned int; otherwise unchanged.

---

Applied to the master branch of the vfs/vfs.git tree.
Patches in the master branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: master

[1/5] Non-functional cleanup of a "__user * filename"
      https://git.kernel.org/vfs/vfs/c/0f05a6af6b7e
[2/5] fs: Add fchmodat2()
      https://git.kernel.org/vfs/vfs/c/8d593559ec09
[3/5] arch: Register fchmodat2, usually as syscall 452
      https://git.kernel.org/vfs/vfs/c/2ee63b04f206
[5/5] selftests: Add fchmodat2 selftest
      https://git.kernel.org/vfs/vfs/c/f175b92081ec