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seccomp.2: Document SECCOMP_RET_USER_NOTIF 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Tycho Andersen 2020-09-26 15:29:47 +02:00 committed by Michael Kerrisk
parent 6fc8b8a0a1
commit c734bbd265
1 changed files with 11 additions and 0 deletions
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man2/seccomp.2
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@ -600,6 +600,17 @@ portion of the filter's return value being passed to user space as the
.IR errno
value without executing the system call.
.TP
.BR SECCOMP_RET_USER_NOTIF " (since Linux 4.21)"
Forwards the syscall to an attached listener in userspace to allow userspace to
decide what to do with the syscall. If there is no attached listener (either
because the filter was not installed with the
.BR SECCOMP_FILTER_FLAG_NEW_LISTENER
or because the fd was closed), the filter returns
.BR ENOSYS
similar to what happens when a filter returns
.BR SECCOMP_RET_TRACE
and there is no tracer. See "Userspace Notification" below for more details.
.TP
.BR SECCOMP_RET_TRACE
When returned, this value will cause the kernel to attempt to notify a
.BR ptrace (2)-based