If the user created a read-only object, they should not be allowed to
circumvent the write protection using the pwrite ioctl.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Jon Bloomfield <jon.bloomfield@xxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.william.auld@xxxxxxxxx>
Reviewed-by: Jon Bloomfield <jon.bloomfield@xxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Reviewed-by: Matthew Auld <matthew.william.auld@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index bdf5f90ce5c0..def8d7a78530 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1623,6 +1623,12 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
goto err;
}
+ /* Writes not allowed into this read-only object */
+ if (i915_gem_object_is_readonly(obj)) {
+ ret = -EINVAL;
+ goto err;
+ }
+
trace_i915_gem_object_pwrite(obj, args->offset, args->size);
ret = -ENODEV;
--
2.18.0
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