linux-kernel - Re: current->mm == NULL in security_vm_enough

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Message-ID: <20090414190504.6f416323@lxorguk.ukuu.org.uk>
Date:	Tue, 14 Apr 2009 19:05:04 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	arjan@...ux.intel.com, gregkh@...e.de, jmorris@...ei.org,
	hooanon05@...oo.co.jp, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: current->mm == NULL in security_vm_enough_memory().

> Thanks for doing the bisection: perhaps that commit just changed timings.

As a PS: I'd still like to understand why this is timing sensitive and
what has happened. We have other cases where khelper and the like
mysteriously acquiring an mm might be had so it would be good to
understand if this is a race between init/khelper setup as to whether it
gets an mm and cloned.
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