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/invoke/accessClassAndFindClass/TestFindClass.java

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+/*
+ * Copyright (c) 2016, 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
+ * @bug 8150782 8207027 8266269
+ * @compile TestFindClass.java TestCls.java p/Foo.java q/Bar.java
+ * @run junit/othervm -ea -esa test.java.lang.invoke.TestFindClass
+ */
+package test.java.lang.invoke;
+
+import java.lang.invoke.*;
+import p.Foo;
+import q.Bar;
+
+import static java.lang.invoke.MethodHandles.*;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TestFindClass {
+
+    private static final String PACKAGE_PREFIX = "test.java.lang.invoke.";
+
+    private static boolean initializedClass1;
+
+    private static class Class1 {
+        static {
+            initializedClass1 = true;
+        }
+    }
+
+    @Test
+    public void initializerNotRun() throws IllegalAccessException, ClassNotFoundException {
+        lookup().findClass(PACKAGE_PREFIX + "TestFindClass$Class1");
+        assertFalse(initializedClass1);
+    }
+
+    @Test
+    public void returnsRequestedClassInSamePackage() throws IllegalAccessException, ClassNotFoundException {
+        Class<?> aClass = lookup().findClass(PACKAGE_PREFIX + "TestFindClass$Class1");
+        assertEquals(Class1.class, aClass);
+    }
+
+    @Test
+    public void returnsRequestedArrayClassInSamePackage() throws IllegalAccessException, ClassNotFoundException {
+        Class<?> aClass = lookup().findClass("[L" + PACKAGE_PREFIX + "TestFindClass$Class1;");
+        assertEquals(Class1[].class, aClass);
+    }
+
+    @Test
+    public void classNotFoundExceptionTest() throws IllegalAccessException, ClassNotFoundException {
+        assertThrows(ClassNotFoundException.class, () -> lookup().findClass(PACKAGE_PREFIX + "TestFindClass$NonExistent"));
+    }
+
+    static Object[][] illegalAccessFind() {
+        return new Object[][] {
+                {publicLookup(), PACKAGE_PREFIX + "TestFindClass$Class1"},
+                {publicLookup(), PACKAGE_PREFIX + "TestCls$PrivateSIC"}
+        };
+    }
+
+    /**
+     * Assertion: @throws IllegalAccessException if the class is not accessible, using the allowed access modes.
+     */
+    @ParameterizedTest
+    @MethodSource("illegalAccessFind")
+    public void illegalAccessExceptionTest(Lookup lookup, String className) throws IllegalAccessException, ClassNotFoundException {
+        assertThrows(ClassNotFoundException.class, () -> lookup.findClass(className));
+    }
+
+    @Test
+    public void okAccess() throws IllegalAccessException, ClassNotFoundException {
+        lookup().findClass(PACKAGE_PREFIX + "TestCls$PrivateSIC");
+    }
+
+    /**
+     * Verify that a protected Q is as accessible as a public Q during linkage
+     * (see JLS 15.12.4.3).
+     */
+    @Test
+    public void protectedInnerClass() throws IllegalAccessException, ClassNotFoundException {
+        lookup().findClass("p.Foo$T");
+        lookup().findClass("[Lp.Foo$T;");
+    }
+
+    @Test
+    public void illegalArgument() throws IllegalAccessException, ClassNotFoundException {
+        assertThrows(NullPointerException.class, () -> lookup().findClass(null));
+    }
+}