From: Zhenliang Wei weizhenliang@huawei.com
commit 98af37d624ed8c83f1953b1b6b2f6866011fc064 upstream.
In the fixes commit, removing SIGKILL from each thread signal mask and executing "goto fatal" directly will skip the call to "trace_signal_deliver". At this point, the delivery tracking of the SIGKILL signal will be inaccurate.
Therefore, we need to add trace_signal_deliver before "goto fatal" after executing sigdelset.
Note: SEND_SIG_NOINFO matches the fact that SIGKILL doesn't have any info.
Link: http://lkml.kernel.org/r/20190425025812.91424-1-weizhenliang@huawei.com Fixes: cf43a757fd4944 ("signal: Restore the stop PTRACE_EVENT_EXIT") Signed-off-by: Zhenliang Wei weizhenliang@huawei.com Reviewed-by: Christian Brauner christian@brauner.io Reviewed-by: Oleg Nesterov oleg@redhat.com Cc: Eric W. Biederman ebiederm@xmission.com Cc: Ivan Delalande colona@arista.com Cc: Arnd Bergmann arnd@arndb.de Cc: Thomas Gleixner tglx@linutronix.de Cc: Deepa Dinamani deepa.kernel@gmail.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- kernel/signal.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/kernel/signal.c +++ b/kernel/signal.c @@ -2441,6 +2441,8 @@ relock: if (signal_group_exit(signal)) { ksig->info.si_signo = signr = SIGKILL; sigdelset(¤t->pending.signal, SIGKILL); + trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO, + &sighand->action[SIGKILL - 1]); recalc_sigpending(); goto fatal; }