| Dan Cashman | 8058248 | 2017-12-06 09:20:27 -0800 | [diff] [blame^] | 1 | # mediacodec - audio and video codecs live here |
| 2 | type mediacodec, domain; |
| 3 | type mediacodec_exec, exec_type, vendor_file_type, file_type; |
| 4 | |
| 5 | typeattribute mediacodec mlstrustedsubject; |
| 6 | |
| 7 | # TODO(b/36375899) attributize this domain appropriately as hal_omx |
| 8 | # and use macro hal_server_domain |
| 9 | get_prop(mediacodec, hwservicemanager_prop) |
| 10 | |
| 11 | # can route /dev/binder traffic to /dev/vndbinder |
| 12 | vndbinder_use(mediacodec) |
| 13 | |
| 14 | not_full_treble(` |
| 15 | # on legacy devices, continue to allow /dev/binder traffic |
| 16 | binder_use(mediacodec) |
| 17 | binder_service(mediacodec) |
| 18 | add_service(mediacodec, mediacodec_service) |
| 19 | allow mediacodec mediametrics_service:service_manager find; |
| 20 | allow mediacodec surfaceflinger_service:service_manager find; |
| 21 | ') |
| 22 | binder_call(mediacodec, binderservicedomain) |
| 23 | binder_call(mediacodec, appdomain) |
| 24 | |
| 25 | # Allow mediacodec access to composer sync fences |
| 26 | allow mediacodec hal_graphics_composer:fd use; |
| 27 | |
| 28 | allow mediacodec gpu_device:chr_file rw_file_perms; |
| 29 | allow mediacodec video_device:chr_file rw_file_perms; |
| 30 | allow mediacodec video_device:dir search; |
| 31 | allow mediacodec ion_device:chr_file rw_file_perms; |
| 32 | allow mediacodec hal_camera:fd use; |
| 33 | |
| 34 | crash_dump_fallback(mediacodec) |
| 35 | |
| 36 | add_hwservice(mediacodec, hal_omx_hwservice) |
| 37 | |
| 38 | hal_client_domain(mediacodec, hal_allocator) |
| 39 | |
| 40 | hal_client_domain(mediacodec, hal_cas) |
| 41 | |
| 42 | # allocate and use graphic buffers |
| 43 | hal_client_domain(mediacodec, hal_graphics_allocator) |
| 44 | |
| 45 | # Recieve gralloc buffer FDs from bufferhubd. Note that mediacodec never |
| 46 | # directly connects to bufferhubd via PDX. Instead, a VR app acts as a bridge |
| 47 | # between those two: it talks to mediacodec via Binder and talks to bufferhubd |
| 48 | # via PDX. Thus, there is no need to use pdx_client macro. |
| 49 | allow mediacodec bufferhubd:fd use; |
| 50 | |
| 51 | ### |
| 52 | ### neverallow rules |
| 53 | ### |
| 54 | |
| 55 | # mediacodec should never execute any executable without a |
| 56 | # domain transition |
| 57 | neverallow mediacodec { file_type fs_type }:file execute_no_trans; |
| 58 | |
| 59 | # The goal of the mediaserver split is to place media processing code into |
| 60 | # restrictive sandboxes with limited responsibilities and thus limited |
| 61 | # permissions. Example: Audioserver is only responsible for controlling audio |
| 62 | # hardware and processing audio content. Cameraserver does the same for camera |
| 63 | # hardware/content. Etc. |
| 64 | # |
| 65 | # Media processing code is inherently risky and thus should have limited |
| 66 | # permissions and be isolated from the rest of the system and network. |
| 67 | # Lengthier explanation here: |
| 68 | # https://android-developers.googleblog.com/2016/05/hardening-media-stack.html |
| 69 | neverallow mediacodec domain:{ tcp_socket udp_socket rawip_socket } *; |