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| author | David Herrmann <dh.herrmann@gmail.com> | 2013-08-25 18:28:59 +0200 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2013-08-27 11:54:58 +1000 |
| commit | acb4652703f0a452405a3ab9319594eddc41391b (patch) | |
| tree | 588ca6991d01ce7e560f39cec65e4fc41b150dd6 /drivers/gpu/drm/ast/ast_ttm.c | |
| parent | ca481c9b2a3ae3598453535b8f0369f1f875d52f (diff) | |
| download | talos-obmc-linux-acb4652703f0a452405a3ab9319594eddc41391b.tar.gz talos-obmc-linux-acb4652703f0a452405a3ab9319594eddc41391b.zip | |
drm: verify vma access in TTM+GEM drivers
GEM does already a good job in tracking access to gem buffers via handles
and drm_vma access management. However, TTM drivers currently do not
verify this during mmap().
TTM provides the verify_access() callback to test this. So fix all drivers
to actually call into gem+vma to verify access instead of always returning
0.
All drivers assume that user-space can only get access to TTM buffers via
GEM handles. So whenever the verify_access() callback is called from
ttm_bo_mmap(), the buffer must have a valid embedded gem object. This is
true for all TTM+GEM drivers. But that's why this patch doesn't touch pure
TTM drivers (ie, vmwgfx).
v2: Switch to drm_vma_node_verify_access() to correctly return -EACCES if
access was denied.
Cc: Dave Airlie <airlied@redhat.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/ast/ast_ttm.c')
| -rw-r--r-- | drivers/gpu/drm/ast/ast_ttm.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c index cf1c833f73ca..20fcf4ee3af0 100644 --- a/drivers/gpu/drm/ast/ast_ttm.c +++ b/drivers/gpu/drm/ast/ast_ttm.c @@ -148,7 +148,9 @@ ast_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl) static int ast_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp) { - return 0; + struct ast_bo *astbo = ast_bo(bo); + + return drm_vma_node_verify_access(&astbo->gem.vma_node, filp); } static int ast_ttm_io_mem_reserve(struct ttm_bo_device *bdev, |
