oss-security - Re: CVE request: kernel: pipe

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Message-ID: <105072328.846661291132211032.JavaMail.root@zmail01.collab.prod.int.phx2.redhat.com>
Date: Tue, 30 Nov 2010 10:50:11 -0500 (EST)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request: kernel: pipe_fcntl local DoS

Please use CVE-2010-4256

Thanks.

-- 
    JB


----- "Eugene Teo" <eugene@...hat.com> wrote:

> "Export 'get_pipe_info()' to other users
> 
> And in particular, use it in 'pipe_fcntl()'.
> 
> The other pipe functions do not need to use the 'careful' version,
> since 
> they are only ever called for things that are already known to be
> pipes.
> 
> The normal read/write/ioctl functions are called through the file 
> operations structures, so if a file isn't a pipe, they'd never get 
> called.  But pipe_fcntl() is special, and called directly from the 
> generic fcntl code, and needs to use the same careful function that
> the 
> splice code is using."
> 
> In other words, this is a pipe_fcntl local DoS.
> 
> http://git.kernel.org/linus/71993e62a47dabddf10302807d6aa260455503f4
> http://git.kernel.org/linus/c66fb347946ebdd5b10908866ecc9fa05ee2cf3d
> 
> Introduced in v2.6.35-rc1
> 
> Thanks, Eugene

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