8301118: Ignore allow and disallow options for java.security.manager System Property

src/java.base/share/classes/java/lang/System.java

@@ -2062,6 +2062,8 @@ private static void initPhase3() {
         if (cn != null) {
             if (cn.isEmpty() || "default".equals(cn)) {
                 System.setSecurityManager(new SecurityManager());
+            } else if ("allow".equals(cn) || "disallow".equals(cn)) {
+                // ignore allow/disallow options
             } else {
                 try {
                     Class<?> c = Class.forName(cn, false, ClassLoader.getBuiltinAppClassLoader());

test/jdk/java/lang/System/AllowSecurityManager.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2024, Azul Systems, Inc. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8301118
+ * @summary Ignore allow and disallow options for java.security.manager System Property
+ * @run main/othervm AllowSecurityManager
+ * @run main/othervm -Djava.security.manager=disallow AllowSecurityManager
+ * @run main/othervm -Djava.security.manager=allow AllowSecurityManager
+ */
+
+public class AllowSecurityManager {
+    public static void main(String[] args) {}
+}