linux-kernel - Re: [PATCH v2] mm: rmap: fix use-after-free in __put_anon

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Message-ID: <alpine.DEB.2.02.1406071450190.24927@chino.kir.corp.google.com>
Date:	Sat, 7 Jun 2014 14:50:30 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, koct9i@...il.com,
	stable@...r.kernel.org
Subject: Re: [PATCH v2] mm: rmap: fix use-after-free in __put_anon_vma

On Fri, 6 Jun 2014, Andrey Ryabinin wrote:

> While working address sanitizer for kernel I've discovered use-after-free
> bug in __put_anon_vma.
> For the last anon_vma, anon_vma->root freed before child anon_vma.
> Later in anon_vma_free(anon_vma) we are referencing to already freed anon_vma->root
> to check rwsem.
> This patch puts freeing of child anon_vma before freeing of anon_vma->root.
> 
> Cc: <stable@...r.kernel.org> # v3.0+
> Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com>

Acked-by: David Rientjes <rientjes@...gle.com>
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