[Intel-gfx] [PATCH] kernfs: Move faulting copy_user operations outside of the mutex

Tejun Heo tj at kernel.org
Thu Mar 31 16:49:15 UTC 2016

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 at linux.intel.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94350
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Tejun Heo <tj at kernel.org>
> Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> Cc: NeilBrown <neilb at suse.de>
> Cc: linux-kernel at vger.kernel.org

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



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