linux-kernel - Re: mm: NULL ptr deref in anon_vma_interval_tree

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Message-ID: <CANN689HXoCMTP4ZRMUNOGAdOBmizKyo6jMqbqAFx8wwPXp+AzQ@mail.gmail.com>
Date:	Sun, 4 Nov 2012 19:31:52 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	Bob Liu <lliubbo@...il.com>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>, hughd@...gle.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: mm: NULL ptr deref in anon_vma_interval_tree_verify

On Sun, Nov 4, 2012 at 6:20 PM, Bob Liu <lliubbo@...il.com> wrote:
> The loop for each entry of vma->anon_vma_chain in validate_mm() is not
> protected by anon_vma lock.
> I think that may be the cause.
>
> Michel, What's your opinion？

Good catch, I think that's it. Somehow it had not occured to me to
verify the checker code - as in, who's checking the checker ? :)

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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