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/VarHandles/VarHandleTestReflection.java

@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2014, 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
+ * @run junit VarHandleTestReflection
+ */
+
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandleInfo;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.VarHandle;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+public class VarHandleTestReflection extends VarHandleBaseTest {
+    String string;
+
+    public static Object[][] accessModesProvider() {
+        return Stream.of(VarHandle.AccessMode.values()).
+                map(am -> new Object[]{am}).
+                toArray(Object[][]::new);
+    }
+
+    static VarHandle handle() throws Exception {
+        return MethodHandles.lookup().
+                findVarHandle(VarHandleTestReflection.class, "string", String.class);
+    }
+
+    @ParameterizedTest
+    @MethodSource("accessModesProvider")
+    public void methodInvocationArgumentMismatch(VarHandle.AccessMode accessMode) throws Exception {
+        VarHandle v = handle();
+
+        // Try a reflective invoke using a Method, with no arguments
+
+        Method vhm = VarHandle.class.getMethod(accessMode.methodName(), Object[].class);
+        assertThrows(IllegalArgumentException.class, () -> vhm.invoke(v, new Object[]{}));
+    }
+
+    @ParameterizedTest
+    @MethodSource("accessModesProvider")
+    public void methodInvocationMatchingArguments(VarHandle.AccessMode accessMode) throws Exception {
+        VarHandle v = handle();
+
+        // Try a reflective invoke using a Method, with the minimal required arguments
+
+        Method vhm = VarHandle.class.getMethod(accessMode.methodName(), Object[].class);
+        Object arg = new Object[0];
+        var e = assertThrows(InvocationTargetException.class, () -> vhm.invoke(v, arg));
+        if (!(e.getCause() instanceof UnsupportedOperationException)) {
+            throw new RuntimeException("expected UnsupportedOperationException but got: "
+                    + e.getCause().getClass().getName(), e);
+        }
+    }
+
+    @ParameterizedTest
+    @MethodSource("accessModesProvider")
+    public void methodHandleInvoke(VarHandle.AccessMode accessMode) throws Throwable {
+        VarHandle v = handle();
+
+        // Try a reflective invoke using a MethodHandle
+
+        MethodHandle mh = MethodHandles.lookup().unreflect(
+                VarHandle.class.getMethod(accessMode.methodName(), Object[].class));
+        // Use invoke to avoid WrongMethodTypeException for
+        // non-signature-polymorphic return types
+        assertThrows(UnsupportedOperationException.class, () -> {
+            Object o = (Object) mh.invoke(v, new Object[]{});
+        });
+    }
+
+    @ParameterizedTest
+    @MethodSource("accessModesProvider")
+    public void methodInvocationFromMethodInfo(VarHandle.AccessMode accessMode) throws Exception {
+        VarHandle v = handle();
+
+        // Try a reflective invoke using a Method obtained from cracking
+        // a MethodHandle
+
+        MethodHandle mh = MethodHandles.lookup().unreflect(
+                VarHandle.class.getMethod(accessMode.methodName(), Object[].class));
+        MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);
+        Method im = info.reflectAs(Method.class, MethodHandles.lookup());
+        assertThrows(IllegalArgumentException.class, () -> {
+            im.invoke(v, new Object[]{});
+        });
+    }
+
+    @ParameterizedTest
+    @MethodSource("accessModesProvider")
+    public void reflectAsFromVarHandleInvoker(VarHandle.AccessMode accessMode) throws Exception {
+        VarHandle v = handle();
+
+        MethodHandle mh = MethodHandles.varHandleInvoker(
+                accessMode, v.accessModeType(accessMode));
+
+        MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);
+
+        assertThrows(IllegalArgumentException.class, () -> info.reflectAs(Method.class, MethodHandles.lookup()));
+    }
+
+    @ParameterizedTest
+    @MethodSource("accessModesProvider")
+    public void reflectAsFromFindVirtual(VarHandle.AccessMode accessMode) throws Exception {
+        VarHandle v = handle();
+
+        MethodHandle mh = MethodHandles.publicLookup().findVirtual(
+                VarHandle.class, accessMode.methodName(), v.accessModeType(accessMode));
+
+        MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);
+
+        assertThrows(IllegalArgumentException.class, () -> info.reflectAs(Method.class, MethodHandles.lookup()));
+    }
+}