Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date: Tue, 28 Feb 2012 09:09:26 -0700
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request -- kernel: cifs: dentry refcount leak
 when opening a FIFO on lookup leads to panic on unmount

On 02/28/2012 08:15 AM, Petr Matousek wrote:
> The cifs code will attempt to open files on lookup under certain
> circumstances. What happens though if we find that the file we opened
> was actually a FIFO or other special file? Currently, the open
> filehandle just ends up being leaked leading to a dentry refcount
> mismatch and oops on umount.
> 
> An unprivileged local user could use this flaw to crash the system.
> 
> Introduced by:
> a6ce4932fbdbcd8f8e8c6df76812014351c32892 (Linux kernel 2.6.31)
> 
> Proposed upstream patch:
> http://thread.gmane.org/gmane.linux.kernel.cifs/5526
> 
> References:
> https://bugzilla.redhat.com/show_bug.cgi?id=798293
> http://thread.gmane.org/gmane.linux.kernel.cifs/5526
> 
> Thanks,

Please use CVE-2012-1090 for this issue.

-- 
Kurt Seifried Red Hat Security Response Team (SRT)

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.