Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date: Wed, 20 Apr 2011 08:58:23 +0800
From: Eugene Teo <eugene@...hat.com>
To: oss-security@...ts.openwall.com
CC: Petr Matousek <pmatouse@...hat.com>, coley@...us.mitre.org,
        robert@...ecki.net
Subject: Re: CVE request -- kernel: proc: signedness issue
 in next_pidmap()

On 04/19/2011 07:54 PM, Petr Matousek wrote:
> "A signedness issue has been found in next_pidmap() function when the "last"
> parameter is negative as next_pidmap() just quietly accepted whatever
> "last" pid that was passed in, which is not all that safe when one of the
> users is /proc.
>
> Setting f_pos to negative value when accessing /proc via readdir()/getdents()
> resulted in sign extension of this value when map pointer was being
> constructed.
>
> This later lead to #GP because the final pointer was not canonical (x86_64)."
>
> References:
> https://bugzilla.redhat.com/show_bug.cgi?id=697822
> http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/93c1088451fd3522/4a28ecb7f755a88d?#4a28ecb7f755a88d
>
> Upstream commit:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=c78193e9
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d8bdc59f

Use CVE-2011-1593.

Eugene
-- 
main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); }

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.