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drm/i915: Reject attempted pwrites into a read-only object

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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@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>
Reviewed-by: Jon Bloomfield <jon.bloomfield@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180712185315.3288-5-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-07-12 19:53:14 +01:00
parent 3e977ac617
commit f8c1cce36c
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/i915_gem.c
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@ -1627,6 +1627,12 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
goto err; 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); trace_i915_gem_object_pwrite(obj, args->offset, args->size);
ret = -ENODEV; ret = -ENODEV;