[PATCH 5/5] drm: drop DRM_AUTH from PRIME_TO/FROM_HANDLE ioctls

[Daniel Vetter]

On Wed, Nov 27, 2019 at 04:27:29PM +0000, Emil Velikov wrote:
> On Wed, 27 Nov 2019 at 07:41, Boris Brezillon
> <boris.brezillon at collabora.com> wrote:
> >
> > Hi Emil,
> >
> > On Fri,  1 Nov 2019 13:03:13 +0000
> > Emil Velikov <emil.l.velikov at gmail.com> wrote:
> >
> > > From: Emil Velikov <emil.velikov at collabora.com>
> > >
> > > As mentioned by Christian, for drivers which support only primary nodes
> > > this changes the returned error from -EACCES into -EOPNOTSUPP/-ENOSYS.
> >
> > Are you sure this is true for MODESET-only nodes (those that do not
> > have the RENDER cap set) implementing ->{fd_to_handle,handle_to_fd}()?
> > Shouldn't the is_authenticated() check still be done in that case?
> >
> Thanks for catching this. Just sent out v2, which I should address the concern.

Why do we need this additional check in v2? What can go wrong on modeset
drivers if non-authenticated legacy things can use this? modeset-only
drivers have all their resources segregated by the drm core (drm_fb,
mmaps, buffer lists), so there's really no access limitations that can go
wrong here.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch