linux-kernel - [PATCH] ptrace: mm_need_new_owner: use ->real

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Message-ID: <20090423211920.GA22377@redhat.com>
Date:	Thu, 23 Apr 2009 23:19:20 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ptrace: mm_need_new_owner: use ->real_parent to search in
	the siblings

"Search in the siblings" should use ->real_parent, not ->parent. If the
task is traced then ->parent == tracer, while the task's parent is always
->real_parent.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>

--- PTRACE/kernel/exit.c~	2009-04-09 00:39:10.000000000 +0200
+++ PTRACE/kernel/exit.c	2009-04-23 23:08:37.000000000 +0200
@@ -590,7 +590,7 @@ retry:
 	/*
 	 * Search in the siblings
 	 */
-	list_for_each_entry(c, &p->parent->children, sibling) {
+	list_for_each_entry(c, &p->real_parent->children, sibling) {
 		if (c->mm == mm)
 			goto assign_new_owner;
 	}

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