Re: [patch 5/13] s390: show_task oops.

[Martin Schwidefsky]

On Thu, 2006-01-12 at 16:58 -0800, Andrew Morton wrote:
> Martin Schwidefsky <schwidefsky@xxxxxxxxxx> wrote:
> >
> > From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
> > 
> > [patch 5/13] s390: show_task oops.
> > 
> > The show_task function walks the kernel stack backchain of
> > processes assuming that the processes are not running. Since
> > this assumption is not correct walking the backchain can lead
> > to an addressing exception and therefore to a kernel hang.
> > So prevent the kernel hang (you still get incorrect results)
> > verity that all read accesses are within the bounds of the
> > kernel stack before performing them.
> > 
> 
> This one needs to be thought about and tested versus the just-merged
> s390-task_stack_page.patch.  I guess it'll still work, but some of the
> pretty new accessors could be used in there, at least.

Oh yes, didn't notice that Al Viro's task_thread_info() changes got
merged in the meantime. We'll test & send a follow-up patch.

-- 
blue skies,
   Martin

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH


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