undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/java/lang/reflect/AccessibleObject/ModuleSetAccessibleTest.java

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+/*
+ * Copyright (c) 2015, 2026, Oracle and/or its affiliates. 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
+ * @build ModuleSetAccessibleTest
+ * @modules java.base/java.lang:open
+ *          java.base/jdk.internal.misc:+open
+ * @run junit/othervm ModuleSetAccessibleTest
+ * @summary Test java.lang.reflect.AccessibleObject with modules
+ */
+
+import java.lang.reflect.AccessibleObject;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InaccessibleObjectException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.security.ProtectionDomain;
+
+import jdk.internal.misc.Unsafe;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+
+public class ModuleSetAccessibleTest {
+
+    /**
+     * Invoke a private constructor on a public class in an exported package
+     */
+    @Test
+    public void testPrivateConstructorInExportedPackage() throws Exception {
+        Constructor<?> ctor = Unsafe.class.getDeclaredConstructor();
+
+        assertThrows(IllegalAccessException.class, () -> ctor.newInstance());
+
+        ctor.setAccessible(true);
+        Unsafe unsafe = (Unsafe) ctor.newInstance();
+    }
+
+
+    /**
+     * Invoke a private method on a public class in an exported package
+     */
+    @Test
+    public void testPrivateMethodInExportedPackage() throws Exception {
+        Method m = Unsafe.class.getDeclaredMethod("throwIllegalAccessError");
+        assertThrows(IllegalAccessException.class, () -> m.invoke(null));
+
+        m.setAccessible(true);
+        InvocationTargetException e = assertThrows(InvocationTargetException.class, () ->
+                m.invoke(null));
+        // thrown by throwIllegalAccessError
+        assertInstanceOf(IllegalAccessError.class, e.getCause());
+    }
+
+
+    /**
+     * Access a private field in a public class that is an exported package
+     */
+    @Test
+    public void testPrivateFieldInExportedPackage() throws Exception {
+        Field f = Unsafe.class.getDeclaredField("theUnsafe");
+        assertThrows(IllegalAccessException.class, () -> f.get(null));
+
+        f.setAccessible(true);
+        Unsafe unsafe = (Unsafe) f.get(null);
+    }
+
+
+    /**
+     * Invoke a public constructor on a public class in a non-exported package
+     */
+    @Test
+    public void testPublicConstructorInNonExportedPackage() throws Exception {
+        Class<?> clazz = Class.forName("sun.security.x509.X500Name");
+        Constructor<?> ctor = clazz.getConstructor(String.class);
+
+        assertThrows(IllegalAccessException.class, () -> ctor.newInstance("cn=duke"));
+
+        assertThrows(InaccessibleObjectException.class, () -> ctor.setAccessible(true));
+
+        ctor.setAccessible(false); // should succeed
+    }
+
+
+    /**
+     * Access a public field in a public class that in a non-exported package
+     */
+    @Test
+    public void testPublicFieldInNonExportedPackage() throws Exception {
+        Class<?> clazz = Class.forName("sun.security.x509.X500Name");
+        Field f = clazz.getField("SERIALNUMBER_OID");
+
+        assertThrows(IllegalAccessException.class, () -> f.get(null));
+
+        assertThrows(InaccessibleObjectException.class, () -> f.setAccessible(true));
+
+        f.setAccessible(false); // should succeed
+    }
+
+
+    /**
+     * Test that the Class constructor cannot be make accessible.
+     */
+    @Test
+    public void testJavaLangClass() throws Exception {
+
+        // non-public constructor
+        Constructor<?> ctor
+            = Class.class.getDeclaredConstructor(ClassLoader.class, Class.class, char.class,
+                                                 ProtectionDomain.class, boolean.class, char.class);
+        AccessibleObject[] ctors = { ctor };
+
+        assertThrows(SecurityException.class, () -> ctor.setAccessible(true));
+        assertThrows(SecurityException.class, () -> AccessibleObject.setAccessible(ctors, true));
+
+        // should succeed
+        ctor.setAccessible(false);
+        AccessibleObject.setAccessible(ctors, false);
+
+    }
+
+}