From: Hsuan-Chi Kuo hsuanchikuo@gmail.com
commit b4d8a58f8dcfcc890f296696cadb76e77be44b5f upstream.
The desired behavior is to set the caller's filter count to thread's. This value is reported via /proc, so this fixes the inaccurate count exposed to userspace; it is not used for reference counting, etc.
Signed-off-by: Hsuan-Chi Kuo hsuanchikuo@gmail.com Link: https://lore.kernel.org/r/20210304233708.420597-1-hsuanchikuo@gmail.com Co-developed-by: Wiktor Garbacz wiktorg@google.com Signed-off-by: Wiktor Garbacz wiktorg@google.com Link: https://lore.kernel.org/lkml/20210810125158.329849-1-wiktorg@google.com Signed-off-by: Kees Cook keescook@chromium.org Cc: stable@vger.kernel.org Fixes: c818c03b661c ("seccomp: Report number of loaded filters in /proc/$pid/status") Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/seccomp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -602,7 +602,7 @@ static inline void seccomp_sync_threads( smp_store_release(&thread->seccomp.filter, caller->seccomp.filter); atomic_set(&thread->seccomp.filter_count, - atomic_read(&thread->seccomp.filter_count)); + atomic_read(&caller->seccomp.filter_count));
/* * Don't let an unprivileged task work around