hal_health: express the sepolicy as attribute

Bug: http://b/32905206



Test: Boot sailfish and no new selinux failures observed in logs

Change-Id: Id9a46180074a61f8cf8d176a7b2ebc995a13b9f9
Signed-off-by: Sandeep Patil <sspatil@google.com>

private/file_contexts

@@ -234,7 +234,7 @@
 /system/bin/hw/android\.hardware\.dumpstate@1\.0-service      u:object_r:hal_dumpstate_default_exec:s0
 /system/bin/hw/android\.hardware\.graphics\.allocator@2\.0-service   u:object_r:hal_graphics_allocator_default_exec:s0
 /system/bin/hw/android\.hardware\.graphics\.composer@2\.1-service    u:object_r:hal_graphics_composer_default_exec:s0
-/system/bin/hw/android\.hardware\.health@1\.0-service         u:object_r:hal_health_exec:s0
+/system/bin/hw/android\.hardware\.health@1\.0-service         u:object_r:hal_health_default_exec:s0
 /system/bin/hw/android\.hardware\.ir@1\.0-service             u:object_r:hal_ir_default_exec:s0
 /system/bin/hw/android\.hardware\.light@2\.0-service          u:object_r:hal_light_default_exec:s0
 /system/bin/hw/android\.hardware\.memtrack@1\.0-service       u:object_r:hal_memtrack_default_exec:s0

private/hal_health.te

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

private/hal_health_default.te

+# health info abstraction
+type hal_health_default, hal_health, domain;
+type hal_health_default_exec, exec_type, file_type;
+
+init_daemon_domain(hal_health_default)
+
+# 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/attributes

@@ -119,6 +119,7 @@ attribute hal_audio;
 attribute hal_dumpstate;
 attribute hal_graphics_allocator;
 attribute hal_graphics_composer;
+attribute hal_health;
 attribute hal_ir;
 attribute hal_light;
 attribute hal_memtrack;

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)