Merge \"add a property for controlling perf_event_paranoid\" into mnc-dev

am: 050243df

Change-Id: Ifc1f319c5d81ed9f5735468d14d7a795b836f373

rootdir/init.rc

@@ -544,6 +544,11 @@ on property:sys.sysctl.extra_free_kbytes=*
 on property:sys.sysctl.tcp_def_init_rwnd=*
     write /proc/sys/net/ipv4/tcp_default_init_rwnd ${sys.sysctl.tcp_def_init_rwnd}
 
+on property:security.perf_harden=0
+    write /proc/sys/kernel/perf_event_paranoid 1
+
+on property:security.perf_harden=1
+    write /proc/sys/kernel/perf_event_paranoid 3
 
 ## Daemon processes to be run by init.
 ##