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Date: Tue, 28 Sep 2010 15:42:35 -0400 (EDT)
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: pktcdvd ioctl dev_minor
 missing range check

Please use CVE-2010-3437

Thanks.

-- 
    JB


----- "Eugene Teo" <eugeneteo@...nel.sg> wrote:

> As Dan Rosenberg explained in the patch commit: The
> PKT_CTRL_CMD_STATUS 
> device ioctl retrieves a pointer to a pktcdvd_device from the global 
> pkt_devs array.  The index into this array is provided directly by the
> 
> user and is a signed integer, so the comparison to ensure that it
> falls 
> within the bounds of this array will fail when provided with a
> negative 
> index.
> 
> This can be used to read arbitrary kernel memory or cause a crash due
> to 
> an invalid pointer dereference.  This can be exploited by users with 
> permission to open /dev/pktcdvd/control (on many distributions, this
> is 
> readable by group "cdrom").
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=638085
> http://git.kernel.org/linus/252a52aa4fa22a668f019e55b3aac3ff71ec1c29
> 
> This was introduced in 2f8e2dc8 (v2.6.10-rc1).
> 
> Thanks, Eugene
> -- 
> main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i);
> }

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