[PATCH 04/13] drm/exynos: drop DRM_AUTH from DRM_RENDER_ALLOW ioctls

[Emil Velikov]

From: Emil Velikov <emil.velikov at collabora.com>

The authentication can be circumvented, by design, by using the render
node.

>From the driver POV there is no distinction between primary and render
nodes, thus we can drop the token.

Cc: Inki Dae <inki.dae at samsung.com>
Cc: Joonyoung Shim <jy0922.shim at samsung.com>
Cc: Seung-Woo Kim <sw0312.kim at samsung.com>
Cc: Kyungmin Park <kyungmin.park at samsung.com>
Cc: Tobias Jakobi <tjakobi at math.uni-bielefeld.de>
Signed-off-by: Emil Velikov <emil.velikov at collabora.com>
---
Gents, I've looked around for userspace and found only libdrm - the
exynos library + simple apps and the X driver. All of which are safe
with this patch.

Please have a look through other some open-source userspace that you
have around.

Tobias, you mentioned userspace projects (mpv, libretro, other) where
you've added exynos backend. Can you please check they work fine with
this patch?

Thanks
Emil
---
 drivers/gpu/drm/exynos/exynos_drm_drv.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index e1ef9dc9ebf3..b461d89accff 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -81,29 +81,29 @@ static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 
 static const struct drm_ioctl_desc exynos_ioctls[] = {
 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
-			DRM_AUTH | DRM_RENDER_ALLOW),
+			DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl,
-			DRM_AUTH | DRM_RENDER_ALLOW),
+			DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
 			DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
 			DRM_AUTH),
 	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
-			DRM_AUTH | DRM_RENDER_ALLOW),
+			DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
-			DRM_AUTH | DRM_RENDER_ALLOW),
+			DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
-			DRM_AUTH | DRM_RENDER_ALLOW),
+			DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_RESOURCES,
 			exynos_drm_ipp_get_res_ioctl,
-			DRM_AUTH | DRM_RENDER_ALLOW),
+			DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_CAPS, exynos_drm_ipp_get_caps_ioctl,
-			DRM_AUTH | DRM_RENDER_ALLOW),
+			DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_LIMITS,
 			exynos_drm_ipp_get_limits_ioctl,
-			DRM_AUTH | DRM_RENDER_ALLOW),
+			DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_COMMIT, exynos_drm_ipp_commit_ioctl,
-			DRM_AUTH | DRM_RENDER_ALLOW),
+			DRM_RENDER_ALLOW),
 };
 
 static const struct file_operations exynos_drm_driver_fops = {
-- 
2.21.0