1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 9f0eafb6d474..cfa9d10e731a 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1121,6 +1121,21 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
 out_set:
 	signalfd_notify(t, sig);
 	sigaddset(&pending->signal, sig);
+
+	/* Let multiprocess signals appear after on-going forks */
+	if (type > PIDTYPE_TGID) {
+		struct multiprocess_signals *delayed;
+		hlist_for_each_entry(delayed, &t->signal->multiprocess, node) {
+			sigset_t *signal = &delayed->signal;
+			/* Can't queue both a stop and a continue signal */
+			if (sig == SIGCONT)
+				sigdelsetmask(signal, SIG_KERNEL_STOP_MASK);
+			else if (sig_kernel_stop(sig))
+				sigdelset(signal, SIGCONT);
+			sigaddset(signal, sig);
+		}
+	}
+
 	complete_signal(sig, t, type);
 ret:
 	trace_signal_generate(sig, info, t, type != PIDTYPE_PID, result);