diff options
Diffstat (limited to 'drivers/gpu/drm/drm_bufs.c')
| -rw-r--r-- | drivers/gpu/drm/drm_bufs.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c index 6d80d17f1e9..80a257554b3 100644 --- a/drivers/gpu/drm/drm_bufs.c +++ b/drivers/gpu/drm/drm_bufs.c @@ -170,6 +170,14 @@ static int drm_addmap_core(struct drm_device * dev, resource_size_t offset, } DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n", (unsigned long long)map->offset, map->size, map->type); + + /* page-align _DRM_SHM maps. They are allocated here so there is no security + * hole created by that and it works around various broken drivers that use + * a non-aligned quantity to map the SAREA. --BenH + */ + if (map->type == _DRM_SHM) + map->size = PAGE_ALIGN(map->size); + if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) { drm_free(map, sizeof(*map), DRM_MEM_MAPS); return -EINVAL; @@ -363,7 +371,8 @@ static int drm_addmap_core(struct drm_device * dev, resource_size_t offset, list->user_token = list->hash.key << PAGE_SHIFT; mutex_unlock(&dev->struct_mutex); - list->master = dev->primary->master; + if (!(map->flags & _DRM_DRIVER)) + list->master = dev->primary->master; *maplist = list; return 0; } |