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UPSTREAM: seccomp: Report number of loaded filters in /proc/$pid/status

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A common question asked when debugging seccomp filters is "how many
filters are attached to your process?" Provide a way to easily answer
this question through /proc/$pid/status with a "Seccomp_filters" line.

Signed-off-by: Kees Cook <keescook@chromium.org>
(cherry picked from commit c818c03b661cd769e035e41673d5543ba2ebda64)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Bug: 176068146
Change-Id: Ib189ea77511a6088d5d328706c77c88709d8d63e
This commit is contained in:
Kees Cook 2020-05-13 14:11:26 -07:00 • committed by Nolen Johnson
commit 9db11ce119
4 changed files with 10 additions and 0 deletions
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3
kernel/seccomp.c
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@ -410,6 +410,8 @@ static inline void seccomp_sync_threads(unsigned long flags)
put_seccomp_filter(thread);
smp_store_release(&thread->seccomp.filter,
caller->seccomp.filter);
atomic_set(&thread->seccomp.filter_count,
atomic_read(&thread->seccomp.filter_count));
/*
* Don't let an unprivileged task work around
@ -551,6 +553,7 @@ static long seccomp_attach_filter(unsigned int flags,
*/
filter->prev = current->seccomp.filter;
current->seccomp.filter = filter;
atomic_inc(&current->seccomp.filter_count);
/* Now that the new filter is in place, synchronize to all threads. */
if (flags & SECCOMP_FILTER_FLAG_TSYNC)