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authorKees Cook <keescook@chromium.org>2020-05-13 14:11:26 -0700
committerKees Cook <keescook@chromium.org>2020-07-10 16:01:51 -0700
commitc818c03b661cd769e035e41673d5543ba2ebda64 (patch)
treeceb9cf9666ce0e0e3964c1ff1a0a5949de471cf6 /kernel/seccomp.c
parente4d05028a07f505a08802a6d1b11674c149df2b3 (diff)
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.c3
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(&current->seccomp.filter_count);
/* Now that the new filter is in place, synchronize to all threads. */
if (flags & SECCOMP_FILTER_FLAG_TSYNC)