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

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Message-ID: <CANN689HM=h2k33sJcoDYys9LHVadv+NaGz00kG7O-OEH=qadvA@mail.gmail.com>
Date:	Mon, 5 Nov 2012 05:41:27 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	Bob Liu <lliubbo@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>, hughd@...gle.com,
	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 8:44 PM, Michel Lespinasse <walken@...gle.com> wrote:
> On Sun, Nov 4, 2012 at 8:14 PM, Bob Liu <lliubbo@...il.com> wrote:
>> Hmm, I attached a simple fix patch.
>
> Reviewed-by: Michel Lespinasse <walken@...gle.com>
> (also ran some tests with it, but I could never reproduce the original
> issue anyway).

Wait a minute, this is actually wrong. You need to call
vma_lock_anon_vma() / vma_unlock_anon_vma() to avoid the issue with
vma->anon_vma == NULL.

I'll fix it and integrate it into my next patch series, which I intend
to send later today. (I am adding new code into validate_mm(), so that
it's easier to have it in the same patch series to avoid merge
conflicts)

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