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 <[email protected]>
---
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,
--
Alessio Belle <[email protected]>
