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| author | Thomas Hellstrom | 2014-03-19 15:06:21 +0100 |
|---|---|---|
| committer | Thomas Hellstrom | 2014-03-28 14:19:04 +0100 |
| commit | f6dfe73abf3ae528b8c631d37739e6d61894c0b2 (patch) | |
| tree | 78fc193a864eb8fbfad6330db6d60f33fb4a8ea9 /drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | |
| parent | drm/ttm: Add a ttm_ref_object_exists function (diff) | |
| download | kernel-qcow2-linux-f6dfe73abf3ae528b8c631d37739e6d61894c0b2.tar.gz kernel-qcow2-linux-f6dfe73abf3ae528b8c631d37739e6d61894c0b2.tar.xz kernel-qcow2-linux-f6dfe73abf3ae528b8c631d37739e6d61894c0b2.zip | |
drm/vmwgfx: Tighten the security around buffer maps
Make sure only buffer objects that are referenced by the client can be mapped.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_resource.c')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c index 30439cbeac2b..01d68f0a69dc 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c @@ -538,8 +538,13 @@ int vmw_user_dmabuf_verify_access(struct ttm_buffer_object *bo, return -EPERM; vmw_user_bo = vmw_user_dma_buffer(bo); - return (vmw_user_bo->prime.base.tfile == tfile || - vmw_user_bo->prime.base.shareable) ? 0 : -EPERM; + + /* Check that the caller has opened the object. */ + if (likely(ttm_ref_object_exists(tfile, &vmw_user_bo->prime.base))) + return 0; + + DRM_ERROR("Could not grant buffer access.\n"); + return -EPERM; } /** |