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seccomp.2: Note that vDSO implementations sometimes fall back to real syscalls 

Reported-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2017-11-09 14:32:56 +01:00
parent 5069617c90
commit 42cfb3552b
1 changed files with 4 additions and 0 deletions
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man2/seccomp.2
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@ -709,6 +709,10 @@ and
.BR time (2).
On such architectures,
seccomp filtering for these system calls will have no effect.
(However, there are cases where the
.BR vdso (7)
implementations may fall back to invoking the true system call,
in which case seccomp filters would see the system call.)
.IP *
Seccomp filtering is based on system call numbers.
However, applications typically do not directly invoke system calls,