These objects are meant to be used by the GPU firmware or by the PM unit within the GPU, in which case they may contain physical addresses.
This adds a layer of protection against exposing potentially exploitable information outside of the driver.
Fixes: ff5f643de0bf ("drm/imagination: Add GEM and VM related code") Signed-off-by: Alessio Belle alessio.belle@imgtec.com --- drivers/gpu/drm/imagination/pvr_gem.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/imagination/pvr_gem.c b/drivers/gpu/drm/imagination/pvr_gem.c index a66cf082af24..c07c9a915190 100644 --- a/drivers/gpu/drm/imagination/pvr_gem.c +++ b/drivers/gpu/drm/imagination/pvr_gem.c @@ -28,6 +28,16 @@ static void pvr_gem_object_free(struct drm_gem_object *obj) drm_gem_shmem_object_free(obj); }
+static struct dma_buf *pvr_gem_export(struct drm_gem_object *obj, int flags) +{ + struct pvr_gem_object *pvr_obj = gem_to_pvr_gem(obj); + + if (pvr_obj->flags & DRM_PVR_BO_PM_FW_PROTECT) + return ERR_PTR(-EPERM); + + return drm_gem_prime_export(obj, flags); +} + static int pvr_gem_mmap(struct drm_gem_object *gem_obj, struct vm_area_struct *vma) { struct pvr_gem_object *pvr_obj = gem_to_pvr_gem(gem_obj); @@ -42,6 +52,7 @@ static int pvr_gem_mmap(struct drm_gem_object *gem_obj, struct vm_area_struct *v static const struct drm_gem_object_funcs pvr_gem_object_funcs = { .free = pvr_gem_object_free, .print_info = drm_gem_shmem_object_print_info, + .export = pvr_gem_export, .pin = drm_gem_shmem_object_pin, .unpin = drm_gem_shmem_object_unpin, .get_sg_table = drm_gem_shmem_object_get_sg_table,
--- base-commit: ca2583412306ceda9304a7c4302fd9efbf43e963 change-id: 20251128-no-export-pm-fw-obj-aeca634ddd0a
Best regards,