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Date: Fri, 12 Nov 2010 08:17:08 -0500 (EST)
From: Josh Bressers <>
Cc: coley <>
Subject: Re: CVE request: kernel: Multiple DoS issues in
 block layer

----- "Dan Rosenberg" <> 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:

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:

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:

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



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