oss-security - Re: CVE-2009-4272 kernel: emergency route cache flushing leads to node deadlock

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Date: Wed, 20 Jan 2010 17:01:40 +0800
From: Eugene Teo <eugeneteo@...nel.sg>
To: oss-security@...ts.openwall.com
CC: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE-2009-4272 kernel: emergency route cache flushing
 leads to node deadlock

On 01/20/2010 10:37 AM, Eugene Teo wrote:
> Reported by the Parallels Virtuozzo Containers team.
>
> If an attacker was able to cause a large enough number of collisions in
> the routing hash table (via specially-crafted packets) for the emergency
> route flush to trigger, a deadlock could occur, or if the kernel routing
> cache was disabled, an uninitialized pointer would be left behind after
> a route lookup, leading to a NULL pointer dereference. Both caused by
> the same issue.
>
> Introduced via:
> c6153b5b77650879d78dec76414213c76dd8d574 v2.6.27-rc4~39^2~41
> 1080d709fb9d8cd4392f93476ee46a9d6ea05a5b v2.6.29-rc1~581^2~973
>
> Patches:
> https://bugzilla.redhat.com/show_bug.cgi?id=545411#c6

^^
http://git.kernel.org/linus/73e42897
http://git.kernel.org/linus/b6280b47

> https://bugzilla.redhat.com/show_bug.cgi?id=545411#c15

I have also fixed the permissions of the file attachments.

Thanks, Eugene

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