Commit 09bca05c authored Jan 06, 2009 by Sukadev Bhattiprolu Committed by Linus Torvalds Jan 06, 2009

SEND_SIG_NOINFO: masquerade si_pid when crossing pid-ns boundary



For SEND_SIG_NOINFO, si_pid is currently set to the pid of sender
in sender's active pid namespace. But if the receiver is in a
Eg: when parent sends the 'pdeath_signal' to a child that is in
a descendant pid namespace, we should set si_pid 0.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Acked-By: Roland McGrath <roland@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent ecb08d81

kernel/signal.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -858,7 +858,8 @@ static int send_signal(int sig, struct siginfo info, struct task_struct t,
		q->info.si_signo = sig;
		q->info.si_errno = 0;
		q->info.si_code = SI_USER;
		q->info.si_pid = task_pid_vnr(current);
		q->info.si_pid = task_pid_nr_ns(current,
		task_active_pid_ns(t));
		q->info.si_uid = current_uid();
		break;
		case (unsigned long) SEND_SIG_PRIV: