1# android user-space log manager
2type logd, domain, mlstrustedsubject;
3type logd_exec, exec_type, file_type;
4
5# Read access to pseudo filesystems.
6r_dir_file(logd, cgroup)
7r_dir_file(logd, proc)
8r_dir_file(logd, proc_meminfo)
9r_dir_file(logd, proc_net)
10
11allow logd self:capability { setuid setgid setpcap sys_nice audit_control };
12allow logd self:capability2 syslog;
13allow logd self:netlink_audit_socket { create_socket_perms_no_ioctl nlmsg_write };
14allow logd kernel:system syslog_read;
15allow logd kmsg_device:chr_file w_file_perms;
16allow logd system_data_file:{ file lnk_file } r_file_perms;
17allow logd pstorefs:dir search;
18allow logd pstorefs:file r_file_perms;
19userdebug_or_eng(`
20  # Access to /data/misc/logd/event-log-tags
21  allow logd misc_logd_file:dir r_dir_perms;
22  allow logd misc_logd_file:file rw_file_perms;
23')
24allow logd runtime_event_log_tags_file:file rw_file_perms;
25
26# Access device logging gating property
27get_prop(logd, device_logging_prop)
28
29r_dir_file(logd, domain)
30
31allow logd kernel:system syslog_mod;
32
33control_logd(logd)
34read_runtime_log_tags(logd)
35
36allow runtime_event_log_tags_file tmpfs:filesystem associate;
37# Typically harmlessly blindly trying to access via liblog
38# event tag mapping while in the untrusted_app domain.
39# Access for that domain is controlled and gated via the
40# event log tag service (albeit at a performance penalty,
41# expected to be locally cached).
42dontaudit domain runtime_event_log_tags_file:file { open read };
43
44###
45### Neverallow rules
46###
47### logd should NEVER do any of this
48
49# Block device access.
50neverallow logd dev_type:blk_file { read write };
51
52# ptrace any other app
53neverallow logd domain:process ptrace;
54
55# ... and nobody may ptrace me (except on userdebug or eng builds)
56neverallow { domain userdebug_or_eng(`-crash_dump') } logd:process ptrace;
57
58# Write to /system.
59neverallow logd system_file:dir_file_class_set write;
60
61# Write to files in /data/data or system files on /data
62neverallow logd { app_data_file system_data_file }:dir_file_class_set write;
63
64# Only init is allowed to enter the logd domain via exec()
65neverallow { domain -init } logd:process transition;
66neverallow * logd:process dyntransition;
67
68# protect the event-log-tags file
69neverallow {
70  domain
71  -init
72  -logd
73} runtime_event_log_tags_file:file no_w_file_perms;
74