linux-kernel - Re: [RFC][PATCH] ps command race fix take2 [4/4] proc_pid

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Date:	Tue, 22 Aug 2006 18:38:20 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, ebiederm@...ssion.com,
	pj@....com, saito.tadashi@...t.fujitsu.com
Subject: Re: [RFC][PATCH] ps command race fix take2 [4/4] proc_pid_readdir

sorry, this rcu_read_lock() should be inserted.

-Kame

 fs/proc/base.c |    2 ++
 1 files changed, 2 insertions(+)

Index: linux-2.6.18-rc4/fs/proc/base.c
===================================================================
--- linux-2.6.18-rc4.orig/fs/proc/base.c
+++ linux-2.6.18-rc4/fs/proc/base.c
@@ -2240,12 +2240,14 @@ retry:
 	 * insertion of token should be done just before not-stale task.
 	 */
 	if (task) {
+		rcu_read_lock();
 		pos = first_alive_task(task);
 		if (pos != task) { /* task is not alive */
 			if (pos)
 				get_task_struct(pos);
 			put_task_struct(task);
 		}
+		rcu_read_unlock();
 		if (pos) { /* remember here for next access */
 			/* token->token turns to be 1 */
 			insert_list_token_rcu(token, &pos->tasks);

-
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