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access.2: BUGS: note that faccessat() wrapper function emulation ignores ACLs 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2020-11-15 12:21:55 +01:00
parent 8faba2435b
commit 06ad6cdfac
1 changed files with 15 additions and 1 deletions
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man2/access.2
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@ -348,7 +348,8 @@ flags are actually implemented within the glibc wrapper function for
.BR faccessat ().
If either of these flags is specified, then the wrapper function employs
.BR fstatat (2)
to determine access permissions.
to determine access permissions, but see BUGS.
.\"
.SS Glibc notes
On older kernels where
.BR faccessat ()
@ -368,6 +369,19 @@ that corresponds to the
.IR dirfd
argument.
.SH BUGS
Because the Linux kernel's
.BR faccessat ()
system call does not support a
.I flags
argument, the glibc
.BR faccessat ()
wrapper function emulates the required functionality using
a combination of the
.BR faccessat ()
system call and
.BR fstatat (2).
However, this emulation does not take ACLs into account.
.PP
In kernel 2.4 (and earlier) there is some strangeness in the handling of
.B X_OK
tests for superuser.