public/perfprofd.te

# perfprofd - perf profile collection daemon
type perfprofd, domain;
type perfprofd_exec, exec_type, file_type;

userdebug_or_eng(`

  typeattribute perfprofd coredomain;
  typeattribute perfprofd mlstrustedsubject;

  # perfprofd needs to control CPU hot-plug in order to avoid kernel
  # perfevents problems in cases where CPU goes on/off during measurement;
  # this means read access to /sys/devices/system/cpu/possible
  # and read/write access to /sys/devices/system/cpu/cpu*/online
  allow perfprofd sysfs_devices_system_cpu:file rw_file_perms;

  # perfprofd checks for the existence of and then invokes simpleperf;
  # simpleperf retains perfprofd domain after exec
  allow perfprofd system_file:file rx_file_perms;

  # perfprofd reads a config file from /data/data/com.google.android.gms/files
  allow perfprofd app_data_file:file r_file_perms;
  allow perfprofd app_data_file:dir search;
  allow perfprofd self:global_capability_class_set { dac_override };

  # perfprofd opens a file for writing in /data/misc/perfprofd
  allow perfprofd perfprofd_data_file:file create_file_perms;
  allow perfprofd perfprofd_data_file:dir rw_dir_perms;

  # perfprofd uses the system log
  read_logd(perfprofd);
  write_logd(perfprofd);

  # perfprofd inspects /sys/power/wake_unlock
  wakelock_use(perfprofd);

  # perfprofd looks at thermals.
  allow perfprofd sysfs_thermal:dir r_dir_perms;

  # perfprofd checks power_supply.
  r_dir_file(perfprofd, sysfs_batteryinfo)

  # simpleperf reads kernel notes.
  allow perfprofd sysfs_kernel_notes:file r_file_perms;

  # Simpleperf & perfprofd query a range of proc stats.
  allow perfprofd proc_loadavg:file r_file_perms;
  allow perfprofd proc_stat:file r_file_perms;
  allow perfprofd proc_modules:file r_file_perms;

  # simpleperf writes to perf_event_paranoid under /proc.
  allow perfprofd proc_perf:file write;

  # Simpleperf: kptr_restrict. This would be required to dump kernel symbols.
  dontaudit perfprofd proc_security:file *;

  # simpleperf uses ioctl() to turn on kernel perf events measurements
  allow perfprofd self:global_capability_class_set sys_admin;

  # simpleperf needs to examine /proc to collect task/thread info
  r_dir_file(perfprofd, domain)

  # simpleperf needs to access /proc/<pid>/exec
  allow perfprofd self:global_capability_class_set { sys_resource sys_ptrace };
  neverallow perfprofd domain:process ptrace;

  # simpleperf needs open/read any file that turns up in a profile
  # to see whether it has a build ID
  allow perfprofd exec_type:file r_file_perms;
  # App & ART artifacts.
  r_dir_file(perfprofd, apk_data_file)
  r_dir_file(perfprofd, dalvikcache_data_file)
  # Vendor libraries.
  r_dir_file(perfprofd, vendor_file)
  # Vendor apps.
  r_dir_file(perfprofd, vendor_app_file)

  # simpleperf will set security.perf_harden to enable access to perf_event_open()
  set_prop(perfprofd, shell_prop)

  # simpleperf examines debugfs on startup to collect tracepoint event types
  r_dir_file(perfprofd, debugfs_tracing)
  allow perfprofd debugfs_tracing_debug:file r_file_perms;

  # simpleperf is going to execute "sleep"
  allow perfprofd toolbox_exec:file rx_file_perms;

  # needed for simpleperf on some kernels
  allow perfprofd self:global_capability_class_set ipc_lock;

  # simpleperf attempts to put a temp file into /data/local/tmp. Do not allow,
  # use the fallback cwd code, do not spam the log. But ensure this is correctly
  # removed at some point. b/70232908.
  dontaudit perfprofd shell_data_file:dir *;
  dontaudit perfprofd shell_data_file:file *;

')