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| author | Kees Cook <keescook@chromium.org> | 2020-05-13 23:11:26 +0200 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2020-07-11 01:01:51 +0200 |
| commit | c818c03b661cd769e035e41673d5543ba2ebda64 (patch) | |
| tree | ceb9cf9666ce0e0e3964c1ff1a0a5949de471cf6 /kernel/seccomp.c | |
| parent | selftests/seccomp: Set NNP for TSYNC ESRCH flag test (diff) | |
| download | linux-c818c03b661cd769e035e41673d5543ba2ebda64.tar.xz linux-c818c03b661cd769e035e41673d5543ba2ebda64.zip | |
seccomp: Report number of loaded filters in /proc/$pid/status
A common question asked when debugging seccomp filters is "how many
filters are attached to your process?" Provide a way to easily answer
this question through /proc/$pid/status with a "Seccomp_filters" line.
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'kernel/seccomp.c')
| -rw-r--r-- | kernel/seccomp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/seccomp.c b/kernel/seccomp.c index d653d8426de9..f387e5004c29 100644 --- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -398,6 +398,8 @@ 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 @@ -544,6 +546,7 @@ static long seccomp_attach_filter(unsigned int flags, */ filter->prev = current->seccomp.filter; current->seccomp.filter = filter; + atomic_inc(¤t->seccomp.filter_count); /* Now that the new filter is in place, synchronize to all threads. */ if (flags & SECCOMP_FILTER_FLAG_TSYNC) |