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SEND_SIG_NOINFO: masquerade si_pid when crossing pid-ns boundary

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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>
This commit is contained in:
Sukadev Bhattiprolu 2009-01-06 14:42:45 -08:00 committed by Linus Torvalds
parent ecb08d8131
commit 09bca05c90
1 changed files with 2 additions and 1 deletions
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3
kernel/signal.c
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@ -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: