linux-kernel - Re: [resend][PATCH 3/4] move cred_guard_mutex from task_struct to signal

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Message-ID: <20101025174220.GA21375@redhat.com>
Date:	Mon, 25 Oct 2010 19:42:20 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [resend][PATCH 3/4] move cred_guard_mutex from task_struct to
	signal_struct

On 10/25, Roland McGrath wrote:
>
> This has my ACK if Oleg doesn't see any problems.

I believe the patch is fine (it already has my reviewed-by).

Except: I am not sure about -stable. At least, this patch should
not go into the <2.6.35 kernels, it relies on misc changes which
changed the scope of task->signal. Before 2.6.35 almost any user
of ->cred_guard_mutex can race with exit and hit ->signal == NULL.

Oleg.

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