Re: md raid null ptr dereference (when sysfs is writable)

[Eugene Teo <eugene () redhat com>]

Marcus Meissner wrote:
> Hi,
>
> http://xorl.wordpress.com/2009/07/21/linux-kernel-md-driver-null-pointer-dereference/
>
> 2.6.30 stable:
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=commit;h=3c92900d9a4afb176d3de335dc0da0198660a244
> mainline:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=b8d966efd9a46a9a35beac50cbff6e30565125ef
>
> While not directly exploitable, its just needs write access to the sysfs files
> to get exploited, so I guess this warrants a CVE number.

Note that the default permission for this sysfs file is 644. It can be
triggered if you are a local privileged user.

Thanks, Eugene