1# mediaextractor - multimedia daemon
2type mediaextractor, domain;
3type mediaextractor_exec, exec_type, file_type;
4
5typeattribute mediaextractor mlstrustedsubject;
6
7binder_use(mediaextractor)
8binder_call(mediaextractor, binderservicedomain)
9binder_call(mediaextractor, appdomain)
10binder_service(mediaextractor)
11
12add_service(mediaextractor, mediaextractor_service)
13allow mediaextractor mediametrics_service:service_manager find;
14allow mediaextractor hidl_token_hwservice:hwservice_manager find;
15
16allow mediaextractor system_server:fd use;
17
18hal_client_domain(mediaextractor, hal_cas)
19
20r_dir_file(mediaextractor, cgroup)
21allow mediaextractor proc_meminfo:file r_file_perms;
22
23crash_dump_fallback(mediaextractor)
24
25# allow mediaextractor read permissions for file sources
26allow mediaextractor media_rw_data_file:file { getattr read };
27allow mediaextractor app_data_file:file { getattr read };
28
29# Read resources from open apk files passed over Binder
30allow mediaextractor apk_data_file:file { read getattr };
31allow mediaextractor asec_apk_file:file { read getattr };
32allow mediaextractor ringtone_file:file { read getattr };
33
34###
35### neverallow rules
36###
37
38# mediaextractor should never execute any executable without a
39# domain transition
40neverallow mediaextractor { file_type fs_type }:file execute_no_trans;
41
42# The goal of the mediaserver split is to place media processing code into
43# restrictive sandboxes with limited responsibilities and thus limited
44# permissions. Example: Audioserver is only responsible for controlling audio
45# hardware and processing audio content. Cameraserver does the same for camera
46# hardware/content. Etc.
47#
48# Media processing code is inherently risky and thus should have limited
49# permissions and be isolated from the rest of the system and network.
50# Lengthier explanation here:
51# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html
52neverallow mediaextractor domain:{ tcp_socket udp_socket rawip_socket } *;
53