pidns: use task_active_pid_ns in do_notify_parent

Using task_active_pid_ns is more robust because it works even after we
have called exit_namespaces.  This change allows us to have parent
processes that are zombies.  Normally a zombie parent processes is crazy
and the last thing you would want to have but in the case of not letting
the init process of a pid namespace be reaped until all of it's children
are dead and reaped a zombie parent process is exactly what we want.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Louis Rilling <louis.rilling@kerlabs.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 6 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index f7b418217633..08dfbd748cd2 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1656,19 +1656,18 @@ bool do_notify_parent(struct task_struct *tsk, int sig)
         info.si_signo = sig;
         info.si_errno = 0;
         /*
-         * we are under tasklist_lock here so our parent is tied to
-         * us and cannot exit and release its namespace.
+         * We are under tasklist_lock here so our parent is tied to
+         * us and cannot change.
          *
-         * the only it can is to switch its nsproxy with sys_unshare,
-         * bu uncharing pid namespaces is not allowed, so we'll always
-         * see relevant namespace
+         * task_active_pid_ns will always return the same pid namespace
+         * until a task passes through release_task.
          *
          * write_lock() currently calls preempt_disable() which is the
          * same as rcu_read_lock(), but according to Oleg, this is not
          * correct to rely on this
          */
         rcu_read_lock();
-        info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
+        info.si_pid = task_pid_nr_ns(tsk, task_active_pid_ns(tsk->parent));
         info.si_uid = from_kuid_munged(task_cred_xxx(tsk->parent, user_ns),
                                        task_uid(tsk));
         rcu_read_unlock();