Bug#538332: linux-2.6: [x86] Null pointer dereference in hrtick_start_fair.

[dann frazier <dannf@debian.org>]

On Fri, Jul 24, 2009 at 02:33:38PM -0700, Alok Kataria wrote:
> Package: linux-2.6
> Version: Debian 5.0r2
> 
> Hi,
> 
> There was a regression on mainline kernel due to my patches for tsc
> unification. 
> It seems lenny has picked-up those unification patches but didn't pick
> the fix for that regression. 

Thanks for the report.
Are you referring to the tsc_32/tsc_64 merge? We haven't included that
for lenny and there aren't currently any plans to. The fixes for
#524542 that I have in the abi branch use the pre-merge version from
Ubuntu.

If you're referring to something else, please let me know..

> I checked sources for Debian5 5.0r2 and its missing the fix.
> 
> The commit details for the fix are
> 
> commit 3d0decc4f49e8645cd6369b02ed076bebd3d61ad
> Author: Ingo Molnar <mingo@elte.hu>
> Date:   Fri Jul 11 15:09:15 2008 +0200
> 
>     x86: fix tsc unification buglet with ftrace and stackprotector
> 
> 
> Please include it in the next security update. 

If you believe this has security implifications, I'd suggest bringing
it up on the oss-security list so that it gets tracked as such.

> We have seen null pointer de-reference in hrtick_start_fair during
> bootup, similar to one mentioned in the commit details.
> 
> Thanks.
> 
> 
> 
> 

-- 
dann frazier