[Libva] [PATCH] drm: remove va_drm_is_authenticated check

[Emil Velikov]

On 17 November 2016 at 15:38, Xiang, Haihao <haihao.xiang at intel.com> wrote:
>>From: Libva [mailto:libva-bounces at lists.freedesktop.org] On Behalf Of Emil
>>Velikov
>>Sent: Tuesday, November 15, 2016 11:24 PM
>>To: libva at lists.freedesktop.org
>>Cc: Daniel Vetter <daniel.vetter at ffwll.ch>; David Herrmann
>><dh.herrmann at gmail.com>
>>Subject: [Libva] [PATCH] drm: remove va_drm_is_authenticated check
>>
>>If we do not use a render node we must authenticate.
>
> It is not true.  A root or master user can access /dev/dri/card0 without authentication in drm.
> va_drm_is_authenticated() is used to check for this cases.
>
Surely you're not suggesting that running your video player as root is
a wise idea ;-)

Regardless, there's something _really_ fishy with libva if it needs
va_drm_is_authenticated.
Any other software out there does not need to (or do so) - some
examples include Xorg, Wayland and other Weston compositors, Mesa, IGT
(a ton of GPU tests) ... be that as root, user or otherwise.

Emil