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/Proxy/ProxyClassAccessTest.java

@@ -0,0 +1,114 @@
+/*
+ * 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.
+ */
+
+import java.lang.module.Configuration;
+import java.lang.module.ModuleFinder;
+import java.lang.reflect.Proxy;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
+
+import jdk.test.lib.compiler.CompilerUtils;
+import static jdk.test.lib.process.ProcessTools.executeTestJava;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+/*
+ * @test
+ * @library /test/lib
+ * @modules jdk.compiler
+ * @build ProxyClassAccessTest q.NP
+ *        jdk.test.lib.compiler.CompilerUtils
+ * @run junit ProxyClassAccessTest
+ * @summary Driver for testing proxy class doesn't have access to
+ *          types referenced by proxy interfaces
+ */
+
+public class ProxyClassAccessTest {
+
+    private static final String TEST_SRC = System.getProperty("test.src");
+    private static final String TEST_CLASSES = System.getProperty("test.classes");
+
+    private static final Path SRC_DIR = Paths.get(TEST_SRC, "src");
+    private static final Path MODS_DIR = Paths.get("mods");
+
+    // the names of the modules in this test
+    private static List<String> modules = Arrays.asList("m1", "m2", "m3", "test");
+
+    /**
+     * Compiles all modules used by the test
+     */
+    @BeforeAll
+    public static void compileAll() throws Exception {
+        for (String mn : modules) {
+            Path msrc = SRC_DIR.resolve(mn);
+            assertTrue(CompilerUtils.compile(msrc, MODS_DIR, "--module-source-path", SRC_DIR.toString()));
+        }
+    }
+
+    /**
+     * Run the modular test
+     */
+    @Test
+    public void runTest() throws Exception {
+        int exitValue = executeTestJava("--module-path", MODS_DIR.toString(),
+                                        "-m", "test/jdk.test.ProxyClassAccess")
+                            .outputTo(System.out)
+                            .errorTo(System.out)
+                            .getExitValue();
+
+        assertEquals(0, exitValue);
+    }
+
+    /**
+     * Test unnamed module has no access to other proxy interface
+     */
+    @Test
+    public void testNoReadAccess() throws Throwable {
+        ModuleFinder finder = ModuleFinder.of(MODS_DIR);
+        ModuleLayer bootLayer = ModuleLayer.boot();
+        Configuration cf = bootLayer
+                .configuration()
+                .resolveAndBind(ModuleFinder.of(), finder, modules);
+        ClassLoader parentLoader = this.getClass().getClassLoader();
+        ModuleLayer layer = bootLayer.defineModulesWithOneLoader(cf, parentLoader);
+
+        ClassLoader loader = layer.findLoader("m1");
+        Class<?>[] interfaces = new Class<?>[] {
+                Class.forName("p.one.I", false, loader),
+                Class.forName("q.NP", false, loader)     // non-public interface in unnamed module
+        };
+        checkIAE(loader, interfaces);
+    }
+
+    private void checkIAE(ClassLoader loader, Class<?>[] interfaces)  throws Throwable {
+        assertThrows(IllegalArgumentException.class, () -> Proxy.getProxyClass(loader, interfaces));
+
+        assertThrows(IllegalArgumentException.class, () -> Proxy.newProxyInstance(loader, interfaces,
+                (proxy, m, params) -> { throw new RuntimeException(m.toString()); }));
+    }
+
+}