TEMPORARY: Always allow managing current thread

Author: prdoyle

libs/entitlement/src/main/java/org/elasticsearch/entitlement/runtime/api/ElasticsearchEntitlementChecker.java

@@ -1009,7 +1009,7 @@ public void checkNewInputStream(Class<?> callerClass, FileSystemProvider that, P
 
     @Override
     public void check$java_lang_Thread$setDaemon(Class<?> callerClass, Thread thread, boolean on) {
-        policyManager.checkManageThreadsEntitlement(callerClass);
+        policyManager.checkManageThreadsEntitlement(callerClass, thread);
     }
 
     @Override
@@ -1024,12 +1024,12 @@ public void checkNewInputStream(Class<?> callerClass, FileSystemProvider that, P
 
     @Override
     public void check$java_lang_Thread$setName(Class<?> callerClass, Thread thread, String name) {
-        policyManager.checkManageThreadsEntitlement(callerClass);
+        policyManager.checkManageThreadsEntitlement(callerClass, thread);
     }
 
     @Override
     public void check$java_lang_Thread$setPriority(Class<?> callerClass, Thread thread, int newPriority) {
-        policyManager.checkManageThreadsEntitlement(callerClass);
+        policyManager.checkManageThreadsEntitlement(callerClass, thread);
     }
 
     @Override
@@ -1038,7 +1038,7 @@ public void checkNewInputStream(Class<?> callerClass, FileSystemProvider that, P
         Thread thread,
         Thread.UncaughtExceptionHandler ueh
     ) {
-        policyManager.checkManageThreadsEntitlement(callerClass);
+        policyManager.checkManageThreadsEntitlement(callerClass, thread);
     }
 
     @Override

libs/entitlement/src/main/java/org/elasticsearch/entitlement/runtime/policy/PolicyManager.java

@@ -380,6 +380,13 @@ public void checkManageThreadsEntitlement(Class<?> callerClass) {
         checkEntitlementPresent(callerClass, ManageThreadsEntitlement.class);
     }
 
+    public void checkManageThreadsEntitlement(Class<?> callerClass, Thread targetThread) {
+        if (targetThread == Thread.currentThread()) {
+            return;
+        }
+        checkEntitlementPresent(callerClass, ManageThreadsEntitlement.class);
+    }
+
     private void checkEntitlementPresent(Class<?> callerClass, Class<? extends Entitlement> entitlementClass) {
         var requestingClass = requestingClass(callerClass);
         if (isTriviallyAllowed(requestingClass)) {