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

From: Ben Hutchings
Date: Thu Jun 23 2011 - 19:15:08 EST

On Thu, 2011-06-23 at 13:34 -0400, Paul Gortmaker wrote:
> From: Timo Warns <Warns@xxxxxxxxxxxx>
> -------------------
> 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 Hutchings
The two most common things in the universe are hydrogen and stupidity.

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