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Re: CVE request -- kernel: cifs: dentry refcount leak when opening a FIFO on lookup leads to panic on unmount
From: Kurt Seifried <kseifried () redhat com>
Date: Tue, 28 Feb 2012 09:09:26 -0700

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)


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