Re: [BUG?]Set XIP mount option on ext2 bypass check.

["Satyam Sharma" <satyam.sharma@gmail.com>]

Hi,

On 6/22/07, Arnd Bergmann <arnd@arndb.de> wrote:
> On Thursday 21 June 2007, Carsten Otte wrote:
> >
> > This is an updated version of my bugfix patch. Yan Zheng pointed out,
> > that ext2_remount lacks checking if -o xip should be enabled or not.
> > This patch checks for presence of direct_access on the backing block
> > device and if the blocksize meets the requirements.
> > Andrew, please consider adding this patch to -mm.
> >
> > Signed-off-by: Carsten Otte <cotte@de.ibm.com>
>
> It looks to me like a local denial of service attack in case of
> user-mountable ext2 file systems in /etc/fstab.
>
> Shouldn't that make it go into 2.6.22?

I agree. I would go on to suggest that all trivially-triggered oopsen /
panics from userspace (even if they require privileges, such as the
cat /dev/snapshot == oops issue posted last week) in fact ought to
be CVE's, and the corresponding fixes for such issues be considered
as candidates for -stable, if applicable to the current stable kernel.

Satyam