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

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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: ff5f643de0 ("drm/imagination: Add GEM and VM related code")
Signed-off-by: Alessio 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: Matt Coster <matt.coster@imgtec.com>
This commit is contained in:
Alessio Belle 2025-12-08 09:11:00 +00:00 committed by Matt Coster
parent 2bfca4fe1f
commit 6b991ad8dc
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GPG Key ID: 79BC19F3D9DE6AB0
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/imagination/pvr_gem.c
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@ -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,