From: Eric W. Biederman <ebiederm@xmission.com>
Date: Thu, 29 Nov 2007 00:21:26 +0000 (-0800)
Subject: proc: remove races from proc_id_readdir()
X-Git-Tag: v2.6.24-rc4~65
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=19fd4bb2a0cfede054e4904e0b167e0ca4f36cc7;p=pandora-kernel.git

proc: remove races from proc_id_readdir()

Oleg noticed that the call of task_pid_nr_ns() in proc_pid_readdir
is racy with respect to tasks exiting.

After a bit of examination it also appears that the call itself
is completely unnecessary.

So to fix the problem this patch modifies next_tgid() to return
both a tgid and the task struct in question.

A structure is introduced to return these values because it is
slightly cleaner and easier to optimize, and the resulting code
is a little shorter.

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