Commit 6588c1e3 authored by Sukadev Bhattiprolu's avatar Sukadev Bhattiprolu Committed by Linus Torvalds

signals: SI_USER: Masquerade si_pid when crossing pid ns boundary

When sending a signal to a descendant namespace, set ->si_pid to 0 since
the sender does not have a pid in the receiver's namespace.

	- If rt_sigqueueinfo() sets si_code to SI_USER when sending a
	  signal across a pid namespace boundary, the value in ->si_pid
	  will be cleared to 0.
Signed-off-by: default avatarSukadev Bhattiprolu <>
Cc: Oleg Nesterov <>
Cc: Roland McGrath <>
Cc: "Eric W. Biederman" <>
Cc: Daniel Lezcano <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent b3bfa0cb
...@@ -883,6 +883,8 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t, ...@@ -883,6 +883,8 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
break; break;
default: default:
copy_siginfo(&q->info, info); copy_siginfo(&q->info, info);
if (from_ancestor_ns)
q->info.si_pid = 0;
break; break;
} }
} else if (!is_si_special(info)) { } else if (!is_si_special(info)) {
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment