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seccomp: add fchmodat2 syscall (kernel v6.6, libseccomp v2.5.5)

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Add this syscall to match the profile in containerd

containerd: a6e52c74fa
libseccomp: 53267af3fb
kernel: 09da082b07

    fs: Add fchmodat2()

    On the userspace side fchmodat(3) is implemented as a wrapper
    function which implements the POSIX-specified interface. This
    interface differs from the underlying kernel system call, which does not
    have a flags argument. Most implementations require procfs [1][2].

    There doesn't appear to be a good userspace workaround for this issue
    but the implementation in the kernel is pretty straight-forward.

    The new fchmodat2() syscall allows to pass the AT_SYMLINK_NOFOLLOW flag,
    unlike existing fchmodat.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 6f242f1a28)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2024-02-06 13:59:04 +01:00
parent 67e9aa6d4d
commit 5fb4eb941d
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2 changed files with 2 additions and 0 deletions
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1
profiles/seccomp/default.json
View file

@ -110,6 +110,7 @@
"fchdir",
"fchmod",
"fchmodat",
"fchmodat2",
"fchown",
"fchown32",
"fchownat",

1
profiles/seccomp/default_linux.go
View file

@ -102,6 +102,7 @@ func DefaultProfile() *Seccomp {
"fchdir",
"fchmod",
"fchmodat",
"fchmodat2", // kernel v6.6, libseccomp v2.5.5
"fchown",
"fchown32",
"fchownat",