Unverified Commit 6b991ad8 authored by Alessio Belle's avatar Alessio Belle Committed by Matt Coster
Browse files

drm/imagination: Disallow exporting of PM/FW protected objects 



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: ff5f643d ("drm/imagination: Add GEM and VM related code")
Signed-off-by: default avatarAlessio Belle <alessio.belle@imgtec.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20251208-no-export-pm-fw-obj-v1-1-83ab12c61693@imgtec.com


Signed-off-by: default avatarMatt Coster <matt.coster@imgtec.com>
parent 2bfca4fe

drivers/gpu/drm/imagination/pvr_gem.c

+11 −0
Original line number Diff line number Diff line
@@ -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,