linux-kernel - Re: [Stable-review] [34-longterm 224/247] fs/partitions/ldm.c: fix oops caused by corrupted partition table

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Date:	Fri, 24 Jun 2011 00:14:54 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	stable@...nel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	stable-review@...nel.org, Timo Warns <warns@...-sense.de>
Subject: Re: [Stable-review] [34-longterm 224/247] fs/partitions/ldm.c: fix
 oops caused by corrupted partition table

On Thu, 2011-06-23 at 13:34 -0400, Paul Gortmaker wrote:
> From: Timo Warns <Warns@...-sense.de>
> 
>                    -------------------
>     This is a commit scheduled for the next v2.6.34 longterm release.
>     If you see a problem with using this for longterm, please comment.
>                    -------------------
> 
> commit c340b1d640001c8c9ecff74f68fd90422ae2448a upstream.
> 
> The kernel automatically evaluates partition tables of storage devices.
> The code for evaluating LDM partitions (in fs/partitions/ldm.c) contains
> a bug that causes a kernel oops on certain corrupted LDM partitions.
> A kernel subsystem seems to crash, because, after the oops, the kernel no
> longer recognizes newly connected storage devices.
> 
> The patch validates the value of vblk_size.
[...]

This doesn't completely fix the possibility of a buffer overflow.  You
also need commit cae13fe4cc3f24820ffb990c09110626837e85d4.

Ben.

-- 
Ben Hutchings
The two most common things in the universe are hydrogen and stupidity.

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