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

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Message-ID: <4E047F39.6060704@windriver.com>
Date:	Fri, 24 Jun 2011 08:12:41 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Ben Hutchings <ben@...adent.org.uk>
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 11-06-23 07:14 PM, Ben Hutchings wrote:
> 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.

Thanks Ben, I will queue that up this morning.

Paul.

> 
> Ben.
> 
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