pid_ns: zap_pid_ns_processes: fix the ->child_reaper changing

add0d4df · Oleg Nesterov <[email protected]> · 2008-09-02 14:35:48 -07:00

zap_pid_ns_processes() sets pid_ns->child_reaper = NULL, this is wrong.

Yes, we have already killed all tasks in this namespace, and sys_wait4()
doesn't see any child.  But this doesn't mean ->children list is empty, we
may have EXIT_DEAD tasks which are not visible to do_wait().  In that case
the subsequent forget_original_parent() will crash the kernel because it
will try to re-parent these tasks to the NULL reaper.

Even if there are no childs, it is not good that forget_original_parent()
uses reaper == NULL.

Change the code to set ->child_reaper = init_pid_ns.child_reaper instead.
We could use pid_ns->parent->child_reaper as well, I think this does not
really matter.  These EXIT_DEAD tasks are not visible to the new ->parent
after re-parenting, they will silently do release_task() eventually.

Note that we must change ->child_reaper, otherwise
forget_original_parent() will use reaper == father, and in that case we
will hit the (correct) BUG_ON(!list_empty(&father->children)).

Signed-off-by: Oleg Nesterov <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Acked-by: Sukadev Bhattiprolu <[email protected]>
Acked-by: Pavel Emelyanov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: add0d4dfd660e9e4fd0af3eac3cad23583c9558f
Parents: e385ea63

Changes

1 files changed · +6 −3

File	Status	Add	Del	Content
kernel/pid_namespace.c	modified	+6	−3	View file

kernel/pid_namespace.c

View file

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index ea567b7..598f1ee 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -179,9 +179,12 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 		rc = sys_wait4(-1, NULL, __WALL, NULL);
 	} while (rc != -ECHILD);
 
-
-	/* Child reaper for the pid namespace is going away */
-	pid_ns->child_reaper = NULL;
+	/*
+	 * We can not clear ->child_reaper or leave it alone.
+	 * There may by stealth EXIT_DEAD tasks on ->children,
+	 * forget_original_parent() must move them somewhere.
+	 */
+	pid_ns->child_reaper = init_pid_ns.child_reaper;
 	acct_exit_ns(pid_ns);
 	return;
 }