6.18-stable review patch. If anyone has any objections, please let me know.
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From: Alessio Belle alessio.belle@imgtec.com
commit 6b991ad8dc3abfe5720fc2e9ee96be63ae43e362 upstream.
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 Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20251208-no-export-pm-fw-obj-v1-1-83ab12c61693@imgt... Signed-off-by: Matt Coster matt.coster@imgtec.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/imagination/pvr_gem.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
--- 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 d 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_o 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,