logpersist: do not permit dynamic transition to domain

We allow domains to manually transition to logpersist for userdebug
or eng debug logging permissions that would be counter to monitoring
limits on a released user build.

Test: compile
Bug: 30566487
Change-Id: I03a81c75cbd2b44617e4b27c4c083a26a0e0fa87

public/logpersist.te

@@ -15,6 +15,12 @@ neverallow logpersist domain:process ptrace;
 # Write to files in /data/data or system files on /data except misc_logd_file
 neverallow logpersist { app_data_file system_data_file }:dir_file_class_set write;
 
-# Only init is allowed to enter the logpersist domain via exec()
-#neverallow { domain -init } logpersist:process transition;
-#neverallow * logpersist:process dyntransition;
+# Only init should be allowed to enter the logpersist domain via exec()
+# Following is a list of debug domains we know that transition to logpersist
+# neverallow_with_undefined_domains {
+#   domain
+#   -init       # goldfish, logcatd, raft
+#   -mmi        # bat, mtp8996, msmcobalt
+#   -system_app # Smith.apk
+# } logpersist:process transition;
+neverallow * logpersist:process dyntransition;