platform_system_sepolicy/private/property.te

# Properties used only in /system
system_internal_prop(adbd_prop)
system_internal_prop(device_config_storage_native_boot_prop)
system_internal_prop(device_config_sys_traced_prop)
system_internal_prop(device_config_window_manager_native_boot_prop)
system_internal_prop(device_config_configuration_prop)
system_internal_prop(gsid_prop)
system_internal_prop(init_perf_lsm_hooks_prop)
system_internal_prop(init_svc_debug_prop)
system_internal_prop(last_boot_reason_prop)
system_internal_prop(netd_stable_secret_prop)
system_internal_prop(pm_prop)
system_internal_prop(system_adbd_prop)
system_internal_prop(traced_perf_enabled_prop)
system_internal_prop(userspace_reboot_log_prop)
system_internal_prop(userspace_reboot_test_prop)

###
### Neverallow rules
###

treble_sysprop_neverallow(`

# TODO(b/131162102): uncomment these after assigning ownership attributes to all properties
# neverallow domain {
#   property_type
#   -system_property_type
#   -product_property_type
#   -vendor_property_type
# }:file no_rw_file_perms;

neverallow { domain -coredomain } {
  system_property_type
  system_internal_property_type
  -system_restricted_property_type
  -system_public_property_type
}:file no_rw_file_perms;

neverallow { domain -coredomain } {
  system_property_type
  -system_public_property_type
}:property_service set;

# init is in coredomain, but should be able to read/write all props.
# dumpstate is also in coredomain, but should be able to read all props.
neverallow { coredomain -init -dumpstate } {
  vendor_property_type
  vendor_internal_property_type
  -vendor_restricted_property_type
  -vendor_public_property_type
}:file no_rw_file_perms;

neverallow { coredomain -init } {
  vendor_property_type
  -vendor_public_property_type
}:property_service set;

')

# There is no need to perform ioctl or advisory locking operations on
# property files. If this neverallow is being triggered, it is
# likely that the policy is using r_file_perms directly instead of
# the get_prop() macro.
neverallow domain property_type:file { ioctl lock };

neverallow * {
  core_property_type
  -audio_prop
  -config_prop
  -cppreopt_prop
  -dalvik_prop
  -debuggerd_prop
  -debug_prop
  -default_prop
  -dhcp_prop
  -dumpstate_prop
  -ffs_prop
  -fingerprint_prop
  -logd_prop
  -net_radio_prop
  -nfc_prop
  -ota_prop
  -pan_result_prop
  -persist_debug_prop
  -powerctl_prop
  -radio_prop
  -restorecon_prop
  -shell_prop
  -system_prop
  -system_radio_prop
  -vold_prop
}:file no_rw_file_perms;

# sigstop property is only used for debugging; should only be set by su which is permissive
# for userdebug/eng
neverallow {
  domain
  -init
  -vendor_init
} ctl_sigstop_prop:property_service set;

# Don't audit legacy ctl. property handling.  We only want the newer permission check to appear
# in the audit log
dontaudit domain {
  ctl_bootanim_prop
  ctl_bugreport_prop
  ctl_console_prop
  ctl_default_prop
  ctl_dumpstate_prop
  ctl_fuse_prop
  ctl_mdnsd_prop
  ctl_rildaemon_prop
}:property_service set;

neverallow {
  domain
  -init
} init_svc_debug_prop:property_service set;

neverallow {
  domain
  -init
  -dumpstate
  userdebug_or_eng(`-su')
} init_svc_debug_prop:file no_rw_file_perms;

compatible_property_only(`
# Prevent properties from being set
  neverallow {
    domain
    -coredomain
    -appdomain
    -vendor_init
  } {
    core_property_type
    extended_core_property_type
    exported_config_prop
    exported_dalvik_prop
    exported_default_prop
    exported_dumpstate_prop
    exported_ffs_prop
    exported_fingerprint_prop
    exported_system_prop
    exported_system_radio_prop
    exported_vold_prop
    exported2_config_prop
    exported2_default_prop
    exported2_system_prop
    exported2_vold_prop
    exported3_default_prop
    exported3_system_prop
    -nfc_prop
    -powerctl_prop
    -radio_prop
  }:property_service set;

  neverallow {
    domain
    -coredomain
    -appdomain
    -hal_nfc_server
  } {
    nfc_prop
  }:property_service set;

  neverallow {
    domain
    -coredomain
    -appdomain
    -hal_telephony_server
    -vendor_init
  } {
    exported_radio_prop
    exported3_radio_prop
  }:property_service set;

  neverallow {
    domain
    -coredomain
    -appdomain
    -hal_telephony_server
  } {
    exported2_radio_prop
    radio_prop
  }:property_service set;

  neverallow {
    domain
    -coredomain
    -bluetooth
    -hal_bluetooth_server
  } {
    bluetooth_prop
  }:property_service set;

  neverallow {
    domain
    -coredomain
    -bluetooth
    -hal_bluetooth_server
    -vendor_init
  } {
    exported_bluetooth_prop
  }:property_service set;

  neverallow {
    domain
    -coredomain
    -hal_camera_server
    -cameraserver
    -vendor_init
  } {
    exported_camera_prop
  }:property_service set;

  neverallow {
    domain
    -coredomain
    -hal_wifi_server
    -wificond
  } {
    wifi_prop
  }:property_service set;

  neverallow {
    domain
    -coredomain
    -hal_wifi_server
    -wificond
    -vendor_init
  } {
    exported_wifi_prop
  }:property_service set;

# Prevent properties from being read
  neverallow {
    domain
    -coredomain
    -appdomain
    -vendor_init
  } {
    core_property_type
    extended_core_property_type
    exported_dalvik_prop
    exported_ffs_prop
    exported_system_radio_prop
    exported2_config_prop
    exported2_system_prop
    exported2_vold_prop
    exported3_default_prop
    exported3_system_prop
    -debug_prop
    -logd_prop
    -nfc_prop
    -powerctl_prop
    -radio_prop
  }:file no_rw_file_perms;

  neverallow {
    domain
    -coredomain
    -appdomain
    -hal_nfc_server
  } {
    nfc_prop
  }:file no_rw_file_perms;

  neverallow {
    domain
    -coredomain
    -appdomain
    -hal_telephony_server
  } {
    radio_prop
  }:file no_rw_file_perms;

  neverallow {
    domain
    -coredomain
    -bluetooth
    -hal_bluetooth_server
  } {
    bluetooth_prop
  }:file no_rw_file_perms;

  neverallow {
    domain
    -coredomain
    -hal_wifi_server
    -wificond
  } {
    wifi_prop
  }:file no_rw_file_perms;
')

compatible_property_only(`
  # Neverallow coredomain to set vendor properties
  neverallow {
    coredomain
    -init
    -system_writes_vendor_properties_violators
  } {
    property_type
    -system_property_type
    -extended_core_property_type
  }:property_service set;
')

neverallow {
  -init
  -system_server
} {
  userspace_reboot_log_prop
}:property_service set;

neverallow {
  # Only allow init and system_server to set system_adbd_prop
  -init
  -system_server
} {
  system_adbd_prop
}:property_service set;

neverallow {
  # Only allow init and adbd to set adbd_prop
  -init
  -adbd
} {
  adbd_prop
}:property_service set;

neverallow {
  # Only allow init and shell to set userspace_reboot_test_prop
  -init
  -shell
} {
  userspace_reboot_test_prop
}:property_service set;