oss-security - Re: CVE request? buffer overflow in CIFS in 2.6.*

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Date: Tue, 07 Apr 2009 13:41:44 +0800
From: Eugene Teo <eugene@...hat.com>
To: Marcus Meissner <meissner@...e.de>
CC: oss-security@...ts.openwall.com, security@...nel.org, sfrench@...ibm.com
Subject: Re: CVE request? buffer overflow in CIFS in 2.6.*

Hi Marcus,

Marcus Meissner wrote:
> Fixes a kmalloc area overflow in CIFS, number of overwritten bytes
> is depending on the codepage converted to.
> 
> The data seems to come from a remote generated reply blob even, correct
> me if I am wrong. :/

Looks like it's part of the session setup. The NativeFileSystem field is
part of the Tree Connect response (TCon for short).

> And I wonder if "len*2" is sufficient, can't a UCS -> UTF8 conversion
> generate more than 2 byte utf-8 characters for 1 ucs character?

I understand that someone from your side is working on a better patch
for this. Do keep us updated when it goes upstream.

Thanks, Eugene
-- 
Eugene Teo / Red Hat Security Response Team

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