oss-security - Re: CVE request: kernel: Multiple DoS issues in block layer

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Date: Fri, 12 Nov 2010 08:17:08 -0500 (EST)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: coley <coley@...re.org>
Subject: Re: CVE request: kernel: Multiple DoS issues in
 block layer


----- "Dan Rosenberg" <dan.j.rosenberg@...il.com> wrote:

> A series of fixes were committed to address several issues I reported in
> the block layer.  These issues require the ability to send device ioctls
> to a SCSI device, which is typically possible for users with group
> 'cdrom' or similar.
> 
> 1. Due to integer underflow and overflow issues when determining the
> number of pages required for maliciously crafted I/O requests, a local
> user could send a device ioctl that results in the sequential allocation
> of a very large number of pages, causing the OOM killer to be invoked and
> crashing the system:
> 
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commit;h=cb4644cac4a2797afc847e6c92736664d4b0ea34

Use CVE-2010-4162 for this one.


> 
> 2. By submitting certain I/O requests with 0 length, a local user could
> cause a kernel panic:
> 
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commit;h=9284bcf4e335e5f18a8bc7b26461c33ab60d0689
> 

Use CVE-2010-4163


> 
> 
> In addition to the fixes for these identified issues, there were also
> patches committed for improved sanity checking on I/O requests, and
> checks to prevent integer overflows in heap allocation sizes.  In my
> testing, I wasn't able to exploit these issues, so just FYI:
> 
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commit;h=9f864c80913467312c7b8690e41fb5ebd1b50e92
> http://git.kernel.org/?p=linux/kernel/git/axboe/linux-2.6-block.git;a=commit;h=f3f63c1c28bc861a931fac283b5bc3585efb8967
> 

I'm not assigning anythign to these, but if someone wants IDs, I'll gladly
do it.

Thanks.

-- 
    JB

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