health: add sepolicy for health hal service

Test: tested with default health HAL on angler running as service.
Bug: b/32754732

Change-Id: Ie0b70d43cb23cd0878e1b7b99b9bebdbd70d17c7
Signed-off-by: Sandeep Patil <sspatil@google.com>

private/file_contexts

@@ -223,6 +223,7 @@
 /system/lib(64)?/libart.*        u:object_r:libart_file:s0
 /system/bin/hw/android\.hardware\.audio@2\.0-service          u:object_r:hal_audio_exec:s0
 /system/bin/hw/android\.hardware\.boot@1\.0-service           u:object_r:hal_boot_exec:s0
+/system/bin/hw/android\.hardware\.health@1\.0-service         u:object_r:hal_health_exec:s0
 /system/bin/hw/android\.hardware\.light@2\.0-service          u:object_r:hal_light_exec:s0
 /system/bin/hw/android\.hardware\.memtrack@1\.0-service       u:object_r:hal_memtrack_exec:s0
 /system/bin/hw/android\.hardware\.nfc@1\.0-service            u:object_r:hal_nfc_exec:s0

private/hal_health.te

+# may be started by init
+init_daemon_domain(hal_health)

public/hal_health.te

+# health info abstraction
+type hal_health, domain;
+type hal_health_exec, exec_type, file_type;
+
+# hwbinder access
+hwbinder_use(hal_health)
+
+# call into healthd for callbacks
+binder_call(hal_health, healthd)
+
+# Read access to system files for HALs in
+# /{system,vendor,odm}/lib[64]/hw/ in order
+# to be able to open the hal implementation .so files
+r_dir_file(hal_health, system_file)

public/healthd.te

@@ -24,6 +24,7 @@ binder_use(healthd)
 binder_service(healthd)
 binder_call(healthd, system_server)
 binder_call(healthd, hwservicemanager)
+binder_call(healthd, hal_health)
 
 allow healthd sysfs_batteryinfo:file r_file_perms;
 allow healthd batteryproperties_service:service_manager { add find };