drm/vmwgfx: Tighten the security around buffer maps
Make sure that other DRM clients can't map the contents of
non-shareable buffer objects.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
index ef1109c..96dc84d 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
@@ -248,13 +248,12 @@
*placement = vmw_sys_placement;
}
-/**
- * FIXME: Proper access checks on buffers.
- */
-
static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
{
- return 0;
+ struct ttm_object_file *tfile =
+ vmw_fpriv((struct drm_file *)filp->private_data)->tfile;
+
+ return vmw_user_dmabuf_verify_access(bo, tfile);
}
static int vmw_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)