platform_system_sepolicy/private/logpersist.te

typeattribute logpersist coredomain;

# android debug log storage in logpersist domains (eng and userdebug only)
userdebug_or_eng(`

  r_dir_file(logpersist, cgroup)
  r_dir_file(logpersist, cgroup_v2)

  allow logpersist misc_logd_file:file create_file_perms;
  allow logpersist misc_logd_file:dir rw_dir_perms;

  allow logpersist self:global_capability_class_set sys_nice;
  allow logpersist pstorefs:dir search;
  allow logpersist pstorefs:file r_file_perms;

  control_logd(logpersist)
  unix_socket_connect(logpersist, logdr, logd)
  get_prop(logpersist, logd_prop)
  read_runtime_log_tags(logpersist)

')

# logcatd is a shell script that execs logcat with various parameters.
allow logpersist shell_exec:file rx_file_perms;
allow logpersist logcat_exec:file rx_file_perms;

allowxperm logpersist misc_logd_file:file ioctl {
  F2FS_IOC_RELEASE_COMPRESS_BLOCKS
  FS_IOC_SETFLAGS
};

###
### Neverallow rules
###
### logpersist should NEVER do any of this

# Block device access.
neverallow logpersist dev_type:blk_file { read write };

# ptrace any other app
neverallow logpersist domain:process ptrace;

# Write to files in /data/data or system files on /data except misc_logd_file
neverallow logpersist { app_data_file_type system_data_file }:dir_file_class_set write;

# Only init should be allowed to enter the logpersist domain via exec()
# Following is a list of debug domains we know that transition to logpersist
# neverallow_with_undefined_domains {
#   domain
#   -init       # goldfish, logcatd, raft
#   -mmi        # bat, mtp8996, msmcobalt
#   -system_app # Smith.apk
# } logpersist:process transition;
neverallow * logpersist:process dyntransition;

# logpersist is allowed to write to /data/misc/log for userdebug and eng builds
neverallow logpersist {
  file_type
  userdebug_or_eng(`-misc_logd_file -coredump_file')
  with_native_coverage(`-method_trace_data_file')
}:file { create write append };
neverallow { domain -init -dumpstate -incidentd userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_rw_file_perms;
neverallow { domain -init userdebug_or_eng(`-logpersist -logd') } misc_logd_file:file no_w_file_perms;
neverallow { domain -init userdebug_or_eng(`-logpersist -logd') } misc_logd_file:dir { add_name link relabelfrom remove_name rename reparent rmdir write };