From: Emil Velikov <emil.velikov@xxxxxxxxxxxxx>
With later commit we'll rework DRM authentication handling. Namely
DRM_AUTH will not be a requirement for DRM_RENDER_ALLOW ioctls.
Since vmwgfx does isolation for primary clients in different master
realms, the DRM_AUTH can be dropped.
The only place where authentication matters, is surface_reference ioctls
whenever a legacy (non-prime) handle is used. For those ioctls we call
vmw_surface_handle_reference(), where we explicitly check if the client
is both a) master and b) unauthenticated - bailing out as result.
Otherwise the usual isolation path kicks in and we're all good.
v2: Reword commit message, since the isolation work has landed.
Cc: VMware Graphics <linux-graphics-maintainer@xxxxxxxxxx>
Cc: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Signed-off-by: Emil Velikov <emil.velikov@xxxxxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 1f989f3605c8..596e5c1bc2c1 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -936,6 +936,13 @@ vmw_surface_handle_reference(struct vmw_private *dev_priv,
user_srf = container_of(base, struct vmw_user_surface,
prime.base);
+ /* Error out if we are unauthenticated master */
+ if (drm_is_primary_client(file_priv) &&
+ !file_priv->authenticated) {
+ ret = -EACCES;
+ goto out_bad_resource;
+ }
+
/*
* Make sure the surface creator has the same
* authenticating master, or is already registered with us.
--
2.23.0
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