drm: Forbid legacy MAP functions for DRIVER_MODESET

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commit 0e975980d435d58df2d430d688b8c18778b42218
Author: Peter Antoine <peter.antoine@intel.com>
Date:   Tue Jun 23 08:18:49 2015 +0100

    drm: Turn off Legacy Context Functions

we need to again make an exception for nouveau, but everyone else
really doesn't need this.

Dave Airlie dug out again why we need this: The problem is the legacy
dri1 open function the nouveau ddx called, and the problematic code is
actually in the X server itself. It was only fixed in

commit b1a630b48210d6a3c44994fce1b73273000ace5c
Author: Dave Airlie <airlied@redhat.com>
Date:   Wed Nov 7 14:45:14 2012 +1000

    nouveau: drop DRI1 device open interface.

Cc: Peter Antoine <peter.antoine@intel.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461691808-12414-5-git-send-email-daniel.vetter@ffwll.ch
Link: http://patchwork.freedesktop.org/patch/msgid/1461691808-12414-6-git-send-email-daniel.vetter@ffwll.ch

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index d92db7007f62..e8a12a4fd400 100644
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -396,6 +396,10 @@ int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
                 return -EPERM;
 
+        if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+            drm_core_check_feature(dev, DRIVER_MODESET))
+                return -EINVAL;
+
         err = drm_addmap_core(dev, map->offset, map->size, map->type,
                               map->flags, &maplist);
 
@@ -438,6 +442,10 @@ int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
         int idx;
         int i;
 
+        if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+            drm_core_check_feature(dev, DRIVER_MODESET))
+                return -EINVAL;
+
         idx = map->offset;
         if (idx < 0)
                 return -EINVAL;
@@ -569,6 +577,10 @@ int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
         struct drm_map_list *r_list;
         int ret;
 
+        if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
+            drm_core_check_feature(dev, DRIVER_MODESET))
+                return -EINVAL;
+
         mutex_lock(&dev->struct_mutex);
         list_for_each_entry(r_list, &dev->maplist, head) {
                 if (r_list->map &&