diff options
| author | Thomas Hellstrom <thellstrom@vmware.com> | 2012-11-21 16:04:18 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-11-28 20:09:08 +1000 |
| commit | d08a9b9cd82f668a5437c23e59063387ca3ecec5 (patch) | |
| tree | ba4f33c31d5cf530c244b2ec0fa8bf5865677563 /drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | |
| parent | 219e81536c8776b30ccf3262c1ceaeaddf7a231a (diff) | |
| download | lwn-d08a9b9cd82f668a5437c23e59063387ca3ecec5.tar.gz lwn-d08a9b9cd82f668a5437c23e59063387ca3ecec5.zip | |
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>
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_resource.c')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c index 88b6f921ee94..0def4ff5b621 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c @@ -458,6 +458,26 @@ out_no_base_object: return ret; } +/** + * vmw_user_dmabuf_verify_access - verify access permissions on this + * buffer object. + * + * @bo: Pointer to the buffer object being accessed + * @tfile: Identifying the caller. + */ +int vmw_user_dmabuf_verify_access(struct ttm_buffer_object *bo, + struct ttm_object_file *tfile) +{ + struct vmw_user_dma_buffer *vmw_user_bo; + + if (unlikely(bo->destroy != vmw_user_dmabuf_destroy)) + return -EPERM; + + vmw_user_bo = vmw_user_dma_buffer(bo); + return (vmw_user_bo->base.tfile == tfile || + vmw_user_bo->base.shareable) ? 0 : -EPERM; +} + int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { |