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author | 2013-08-25 18:28:58 +0200 | |
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committer | 2013-08-27 11:54:56 +1000 | |
commit | ca481c9b2a3ae3598453535b8f0369f1f875d52f (patch) | |
tree | 31b84f86251db898aa8fc8a1dfa14c3bd9a0ae97 /tools/perf/scripts/python/export-to-postgresql.py | |
parent | drm/vma: add access management helpers (diff) | |
download | linux-dev-ca481c9b2a3ae3598453535b8f0369f1f875d52f.tar.xz linux-dev-ca481c9b2a3ae3598453535b8f0369f1f875d52f.zip |
drm/gem: implement vma access management
We implement automatic vma mmap() access management for all drivers using
gem_mmap. We use the vma manager to add each open-file that creates a
gem-handle to the vma-node of the underlying gem object. Once the handle
is destroyed, we drop the open-file again.
This allows us to use drm_vma_node_is_allowed() on _any_ gem object to see
whether an open-file is granted access. In drm_gem_mmap() we use this to
verify that unprivileged users cannot guess gem offsets and map arbitrary
buffers.
Note that this manages access for _all_ gem users (also TTM+GEM), but the
actual access checks are only done for drm_gem_mmap(). TTM drivers use the
TTM mmap helpers, which need to do that separately.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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