Commit 6588c1e3 authored Apr 02, 2009 by Sukadev Bhattiprolu Committed by Linus Torvalds Apr 02, 2009

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.

Note:
	- 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: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent b3bfa0cb

kernel/signal.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -883,6 +883,8 @@ static int __send_signal(int sig, struct siginfo info, struct task_struct t,
		break;
		default:
		copy_siginfo(&q->info, info);
		if (from_ancestor_ns)
		q->info.si_pid = 0;
		break;
		}
		} else if (!is_si_special(info)) {

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