[PATCH RESEND linux next] signal: Update the comment on __send_signal_locked() in do_notify_parent()

[jiang.kun2]

From: Qiu Yutan <qiu.yutan@xxxxxxxxxx>

Update the comments for the call to __send_signal_locked()
in do_notify_parent() based on community discussions.

Suggested-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Qiu Yutan <qiu.yutan@xxxxxxxxxx>
Signed-off-by: Fan Yu <fan.yu9@xxxxxxxxxx>
Signed-off-by: Jiang Kun <jiang.kun2@xxxxxxxxxx>
---
 kernel/signal.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 148082db9a55..45dc60f8b833 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2252,8 +2252,8 @@ bool do_notify_parent(struct task_struct *tsk, int sig)
 			sig = 0;
 	}
 	/*
-	 * Send with __send_signal as si_pid and si_uid are in the
-	 * parent's namespaces.
+	 * Use __send_signal_locked() instead of send_signal_locked()
+	 * because the latter can wrongly change si_pid/si_uid
 	 */
 	if (valid_signal(sig) && sig)
 		__send_signal_locked(sig, &info, tsk->parent, PIDTYPE_TGID, false);
-- 
2.25.1