drm: Do not drop root privileges for a fancier younger process
When a second process opens the device and master transferrence is
complete, we walk the list of open devices and remove their
authentication. This also revokes our root privilege. Instead of simply
dropping the authentication, this patch reverts the authenticated state
back to its original value.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index ee2d330..3a7176c 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -239,7 +239,8 @@
priv->ioctl_count = 0;
/* for compatibility root is always authenticated */
- priv->authenticated = capable(CAP_SYS_ADMIN);
+ priv->always_authenticated = capable(CAP_SYS_ADMIN);
+ priv->authenticated = priv->always_authenticated;
priv->lock_count = 0;
INIT_LIST_HEAD(&priv->lhead);
@@ -533,7 +534,7 @@
list_for_each_entry(temp, &dev->filelist, lhead) {
if ((temp->master == file_priv->master) &&
(temp != file_priv))
- temp->authenticated = 0;
+ temp->authenticated = temp->always_authenticated;
}
/**