1# audioserver - audio services daemon
2
3typeattribute audioserver coredomain;
4
5type audioserver_exec, exec_type, file_type, system_file_type;
6init_daemon_domain(audioserver)
7tmpfs_domain(audioserver)
8
9r_dir_file(audioserver, sdcard_type)
10
11binder_use(audioserver)
12binder_call(audioserver, binderservicedomain)
13binder_call(audioserver, appdomain)
14binder_service(audioserver)
15
16hal_client_domain(audioserver, hal_allocator)
17# /system/lib64/hw for always-passthrough Allocator HAL ashmem / mapper .so
18r_dir_file(audioserver, system_file)
19
20hal_client_domain(audioserver, hal_audio)
21
22userdebug_or_eng(`
23  # used for TEE sink - pcm capture for debug.
24  allow audioserver media_data_file:dir create_dir_perms;
25  allow audioserver audioserver_data_file:dir create_dir_perms;
26  allow audioserver audioserver_data_file:file create_file_perms;
27
28  # ptrace to processes in the same domain for memory leak detection
29  allow audioserver self:process ptrace;
30')
31
32add_service(audioserver, audioserver_service)
33allow audioserver activity_service:service_manager find;
34allow audioserver appops_service:service_manager find;
35allow audioserver batterystats_service:service_manager find;
36allow audioserver external_vibrator_service:service_manager find;
37allow audioserver package_native_service:service_manager find;
38allow audioserver permission_service:service_manager find;
39allow audioserver permission_checker_service:service_manager find;
40allow audioserver power_service:service_manager find;
41allow audioserver scheduling_policy_service:service_manager find;
42allow audioserver mediametrics_service:service_manager find;
43allow audioserver sensor_privacy_service:service_manager find;
44allow audioserver soundtrigger_middleware_service:service_manager find;
45
46# Allow read/write access to bluetooth-specific properties
47set_prop(audioserver, bluetooth_a2dp_offload_prop)
48set_prop(audioserver, bluetooth_audio_hal_prop)
49set_prop(audioserver, bluetooth_prop)
50set_prop(audioserver, exported_bluetooth_prop)
51
52# Grant access to audio files to audioserver
53allow audioserver audio_data_file:dir ra_dir_perms;
54allow audioserver audio_data_file:file create_file_perms;
55
56# allow access to ALSA MMAP FDs for AAudio API
57allow audioserver audio_device:chr_file { read write };
58
59not_full_treble(`allow audioserver audio_device:dir r_dir_perms;')
60not_full_treble(`allow audioserver audio_device:chr_file rw_file_perms;')
61
62# For A2DP bridge which is loaded directly into audioserver
63unix_socket_connect(audioserver, bluetooth, bluetooth)
64
65# Allow shell commands from ADB and shell for CTS testing/dumping
66allow audioserver adbd:fd use;
67allow audioserver adbd:unix_stream_socket { read write };
68allow audioserver shell:fifo_file { read write };
69
70# Allow shell commands from ADB for CTS testing/dumping
71userdebug_or_eng(`
72  allow audioserver su:fd use;
73  allow audioserver su:fifo_file { read write };
74  allow audioserver su:unix_stream_socket { read write };
75')
76
77# Allow write access to log tag property
78set_prop(audioserver, log_tag_prop);
79
80###
81### neverallow rules
82###
83
84# audioserver should never execute any executable without a
85# domain transition
86neverallow audioserver { file_type fs_type }:file execute_no_trans;
87
88# The goal of the mediaserver split is to place media processing code into
89# restrictive sandboxes with limited responsibilities and thus limited
90# permissions. Example: Audioserver is only responsible for controlling audio
91# hardware and processing audio content. Cameraserver does the same for camera
92# hardware/content. Etc.
93#
94# Media processing code is inherently risky and thus should have limited
95# permissions and be isolated from the rest of the system and network.
96# Lengthier explanation here:
97# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html
98neverallow audioserver domain:{ tcp_socket udp_socket rawip_socket } *;
99
100# Allow using wake locks
101wakelock_use(audioserver)
102
103# Allow reading audio config props, e.g. af.fast_track_multiplier
104get_prop(audioserver, audio_config_prop)
105