ffa0dd93f3
This patch adds the necessary rules to support the existing usage of
perf_event_open by the system partition, which almost exclusively
concerns the simpleperf profiler. A new domain is introduced for some
(but not all) executions of the system image simpleperf. The following
configurations are supported:
* shell -> shell process (no domain transition)
* shell -> debuggable app (through shell -> runas -> runas_app)
* shell -> profileable app (through shell -> simpleperf_app_runner ->
untrusted_app -> simpleperf)
* debuggable/profile app -> self (through untrusted_app -> simpleperf)
simpleperf_app_runner still enters the untrusted_app domain immediately
before exec to properly inherit the categories related to MLS. My
understanding is that a direct transition would require modifying
external/selinux and seapp_contexts as with "fromRunAs", which seems
unnecessarily complex for this case.
runas_app can still run side-loaded binaries and use perf_event_open,
but it checks that the target app is exactly "debuggable"
(profileability is insufficient).
system-wide profiling is effectively constrained to "su" on debug
builds.
See go/perf-event-open-security for a more detailed explanation of the
scenarios covered here.
Tested: "atest CtsSimpleperfTestCases" on crosshatch-user/userdebug
Tested: manual simpleperf invocations on crosshatch-userdebug
Bug: 137092007
Change-Id: I2100929bae6d81f336f72eff4235fd5a78b94066
107 lines
4.2 KiB
Text
107 lines
4.2 KiB
Text
# All types must be defined regardless of build variant to ensure
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# policy compilation succeeds with userdebug/user combination at boot
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type su, domain;
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# File types must be defined for file_contexts.
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type su_exec, system_file_type, exec_type, file_type;
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userdebug_or_eng(`
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# Domain used for su processes, as well as for adbd and adb shell
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# after performing an adb root command. The domain definition is
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# wrapped to ensure that it does not exist at all on -user builds.
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typeattribute su mlstrustedsubject;
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# Add su to various domains
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net_domain(su)
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# grant su access to vndbinder
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vndbinder_use(su)
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dontaudit su self:capability_class_set *;
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dontaudit su kernel:security *;
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dontaudit su { kernel file_type }:system *;
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dontaudit su self:memprotect *;
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dontaudit su domain:{ process process2 } *;
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dontaudit su domain:fd *;
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dontaudit su domain:dir *;
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dontaudit su domain:lnk_file *;
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dontaudit su domain:{ fifo_file file } *;
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dontaudit su domain:socket_class_set *;
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dontaudit su domain:ipc_class_set *;
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dontaudit su domain:key *;
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dontaudit su fs_type:filesystem *;
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dontaudit su {fs_type dev_type file_type}:dir_file_class_set *;
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dontaudit su node_type:node *;
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dontaudit su node_type:{ tcp_socket udp_socket rawip_socket } *;
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dontaudit su netif_type:netif *;
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dontaudit su port_type:socket_class_set *;
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dontaudit su port_type:{ tcp_socket dccp_socket } *;
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dontaudit su domain:peer *;
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dontaudit su domain:binder *;
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dontaudit su property_type:property_service *;
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dontaudit su property_type:file *;
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dontaudit su service_manager_type:service_manager *;
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dontaudit su hwservice_manager_type:hwservice_manager *;
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dontaudit su vndservice_manager_type:service_manager *;
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dontaudit su servicemanager:service_manager list;
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dontaudit su hwservicemanager:hwservice_manager list;
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dontaudit su vndservicemanager:service_manager list;
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dontaudit su keystore:keystore_key *;
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dontaudit su domain:drmservice *;
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dontaudit su unlabeled:filesystem *;
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dontaudit su postinstall_file:filesystem *;
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dontaudit su domain:bpf *;
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dontaudit su unlabeled:vsock_socket *;
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dontaudit su self:perf_event *;
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# VTS tests run in the permissive su domain on debug builds, but the HALs
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# being tested run in enforcing mode. Because hal_foo_server is enforcing
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# su needs to be declared as hal_foo_client to grant hal_foo_server
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# permission to interact with it.
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typeattribute su halclientdomain;
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typeattribute su hal_allocator_client;
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typeattribute su hal_atrace_client;
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typeattribute su hal_audio_client;
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typeattribute su hal_authsecret_client;
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typeattribute su hal_bluetooth_client;
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typeattribute su hal_bootctl_client;
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typeattribute su hal_camera_client;
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typeattribute su hal_configstore_client;
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typeattribute su hal_confirmationui_client;
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typeattribute su hal_contexthub_client;
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typeattribute su hal_drm_client;
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typeattribute su hal_cas_client;
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typeattribute su hal_dumpstate_client;
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typeattribute su hal_fingerprint_client;
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typeattribute su hal_gatekeeper_client;
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typeattribute su hal_gnss_client;
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typeattribute su hal_graphics_allocator_client;
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typeattribute su hal_graphics_composer_client;
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typeattribute su hal_health_client;
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typeattribute su hal_input_classifier_client;
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typeattribute su hal_ir_client;
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typeattribute su hal_keymaster_client;
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typeattribute su hal_light_client;
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typeattribute su hal_memtrack_client;
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typeattribute su hal_neuralnetworks_client;
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typeattribute su hal_nfc_client;
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typeattribute su hal_oemlock_client;
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typeattribute su hal_power_client;
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typeattribute su hal_rebootescrow_client;
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typeattribute su hal_secure_element_client;
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typeattribute su hal_sensors_client;
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typeattribute su hal_telephony_client;
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typeattribute su hal_tetheroffload_client;
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typeattribute su hal_thermal_client;
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typeattribute su hal_tv_cec_client;
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typeattribute su hal_tv_input_client;
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typeattribute su hal_tv_tuner_client;
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typeattribute su hal_usb_client;
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typeattribute su hal_vibrator_client;
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typeattribute su hal_vr_client;
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typeattribute su hal_weaver_client;
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typeattribute su hal_wifi_client;
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typeattribute su hal_wifi_hostapd_client;
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typeattribute su hal_wifi_offload_client;
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typeattribute su hal_wifi_supplicant_client;
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')
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