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Date: Wed, 24 Nov 2010 08:06:00 -0500 (EST)
From: Josh Bressers <>
Cc: "Steven M. Christey" <>
Subject: Re: CVE request: xen: request-processing loop is
 unbounded in blkback

Please use CVE-2010-4247.



----- "Eugene Teo" <> wrote:

> If the frontend pass a bad index of production request, the backend
> will 
> enter an endless loop and then cause a excessive CPU consumption. A
> Xen 
> guest can cause the Xen host to be unresponsive.
> This issue has been fixed in upstream by:
> changeset:   391:77f831cbb91d
> user:        Keir Fraser <>
> date:        Fri Jan 18 16:52:25 2008 +0000
> summary:     blkback: Request-processing loop is unbounded and hence 
> requires a
> changeset:   392:7070d34f251c
> user:        Keir Fraser <>
> date:        Mon Jan 21 11:43:31 2008 +0000
> summary:     blkback/blktap: Check for kthread_should_stop() in inner
> loop,
> Thanks, Eugene

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