Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 22 Jun 2011 15:23:15 +0800
From: Eugene Teo <eugene@...hat.com>
To: oss-security@...ts.openwall.com
CC: Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: CVE request: kernel: taskstats local DoS

On 06/22/2011 03:17 PM, Vasiliy Kulikov wrote:
> "Currently a single process may register exit handlers unlimited times.
> It may lead to a bloated listeners chain and very slow process terminations.
> E.g. after 10KK sent TASKSTATS_CMD_ATTR_REGISTER_CPUMASKs ~300 Mb of
> kernel memory is stolen for the handlers chain and "time id" shows 2-7
> seconds instead of normal 0.003.  It makes it possible to exhaust all
> kernel memory and to eat much of CPU time by triggerring numerous exits
> on a single CPU.
> 
> The patch limits the number of times a single process may register
> itself on a single CPU to one."
> 
> It makes it possible for unprivileged user eat kernel memory and CPU
> without triggering OOM killer.
> 
> Was introduced in f9fd8914c1acca0d98b69d831b128d5b52f03c51.
> 
> http://lists.openwall.net/linux-kernel/2011/06/16/605

Please use CVE-2011-2484.

Thanks, Eugene

Powered by blists - more mailing lists

Your e-mail address:

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.