From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Mon, 2 Oct 2006 09:18:59 +0000 (-0700)
Subject: [PATCH] introduce get_task_pid() to fix unsafe get_pid()
X-Git-Tag: v2.6.19-rc1~379
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a657f78dcc8ea7c53eaa1f2a45ea2315738c15f;p=pandora-kernel.git

[PATCH] introduce get_task_pid() to fix unsafe get_pid()

proc_pid_make_inode:

	ei->pid = get_pid(task_pid(task));

I think this is not safe.  get_pid() can be preempted after checking "pid
!= NULL".  Then the task exits, does detach_pid(), and RCU frees the pid.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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