Re: CVE request - kernel: pktcdvd ioctl dev_minor missing range check

[Josh Bressers <bressers () redhat com>]

Please use CVE-2010-3437

Thanks.

-- 
    JB


----- "Eugene Teo" <eugeneteo () kernel 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);
> }