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