Re: [PATCH] kernfs: Move faulting copy_user operations outside of the mutex

Tejun Heo
2016-03-31T16:49:19Z

On Thu, Mar 31, 2016 at 11:45:06AM +0100, Chris Wilson wrote:
> A fault in a user provided buffer may lead anywhere, and lockdep warns
> that we have a potential deadlock between the mm->mmap_sem and the
> kernfs file mutex:
...
> Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94350
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: NeilBrown <neilb@suse.de>
> Cc: linux-kernel@vger.kernel.org

Acked-by: Tejun Heo <tj@kernel.org>

Thanks!

--
tejun