On 08/12/2025 09:11, Alessio Belle wrote:

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

Reviewed-by: Matt Coster matt.coster@imgtec.com

And I believe we want this to be:

Cc: stable@vger.kernel.org

Cheers, Matt

---

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 alessio.belle@imgtec.com