drm/radeon: forbid mapping of userptr bo through radeon device file
authorJérôme Glisse <jglisse@redhat.com>
Tue, 19 Apr 2016 13:07:50 +0000 (09:07 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Fri, 22 Apr 2016 00:03:46 +0000 (20:03 -0400)
Allowing userptr bo which are basicly a list of page from some vma
(so either anonymous page or file backed page) would lead to serious
corruption of kernel structures and counters (because we overwrite
the page->mapping field when mapping buffer).

This will already block if the buffer was populated before anyone does
try to mmap it because then TTM_PAGE_FLAG_SG would be set in in the
ttm_tt flags. But that flag is check before ttm_tt_populate in the ttm
vm fault handler.

So to be safe just add a check to verify_access() callback.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/radeon/radeon_ttm.c

index 7dddfdce85e6be56f5d6bab8787fad82aa120809..90f739478a1b5257b488d120245d77d4cf561a70 100644 (file)
@@ -235,6 +235,8 @@ static int radeon_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
        struct radeon_bo *rbo = container_of(bo, struct radeon_bo, tbo);
 
+       if (radeon_ttm_tt_has_userptr(bo->ttm))
+               return -EPERM;
        return drm_vma_node_verify_access(&rbo->gem_base.vma_node, filp);
 }