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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-07-12 19:53:13 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2018-07-13 16:14:04 +0100 |
| commit | 3e977ac6179b39faa3c0eda5fce4f00663ae298d (patch) | |
| tree | b281e50e673251b362eaa99b8468ff83f98c4045 /include/drm | |
| parent | c9e666880de5a1fed04dc412b046916d542b72dd (diff) | |
| download | linux-3e977ac6179b39faa3c0eda5fce4f00663ae298d.tar.gz linux-3e977ac6179b39faa3c0eda5fce4f00663ae298d.tar.bz2 linux-3e977ac6179b39faa3c0eda5fce4f00663ae298d.zip | |
drm/i915: Prevent writing into a read-only object via a GGTT mmap
If the user has created a read-only object, they should not be allowed
to circumvent the write protection by using a GGTT mmapping. Deny it.
Also most machines do not support read-only GGTT PTEs, so again we have
to reject attempted writes. Fortunately, this is known a priori, so we
can at least reject in the call to create the mmap (with a sanity check
in the fault handler).
v2: Check the vma->vm_flags during mmap() to allow readonly access.
v3: Remove VM_MAYWRITE to curtail mprotect()
Testcase: igt/gem_userptr_blits/readonly_mmap*
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Cc: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com> #v1
Reviewed-by: Jon Bloomfield <jon.bloomfield@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180712185315.3288-4-chris@chris-wilson.co.uk
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/drm_vma_manager.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/drm/drm_vma_manager.h b/include/drm/drm_vma_manager.h index 8758df94e9a0..c7987daeaed0 100644 --- a/include/drm/drm_vma_manager.h +++ b/include/drm/drm_vma_manager.h @@ -41,6 +41,7 @@ struct drm_vma_offset_node { rwlock_t vm_lock; struct drm_mm_node vm_node; struct rb_root vm_files; + bool readonly:1; }; struct drm_vma_offset_manager { |