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

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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.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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test/jdk/java/lang/invoke/defineHiddenClass/PreviewHiddenClass.java Normal file
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/*
* Copyright (c) 2021, 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 8245432
* @modules jdk.compiler
* @library /test/lib
* @requires !java.enablePreview
* @build jdk.test.lib.Utils
* jdk.test.lib.compiler.CompilerUtils
* @run junit PreviewHiddenClass
* @summary verify UnsupportedClassVersionError thrown when defining a hidden class
* with preview minor version but --enable-preview is not set
* @comment This test itself cannot enablePreview, or hidden class definition
* will pass
*/
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.lang.invoke.MethodHandles;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import jdk.test.lib.compiler.CompilerUtils;
import jdk.test.lib.Utils;
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
public class PreviewHiddenClass {
private static final Path SRC_DIR = Paths.get(Utils.TEST_SRC, "src");
private static final Path CLASSES_DIR = Paths.get("classes");
@Test
public void previewNotEnabled() throws Exception {
// compile a class with --enable-preview
Path sourceFile = SRC_DIR.resolve("HiddenInterface.java");
String[] options = new String[] {
"--enable-preview", "-source", String.valueOf(Runtime.version().feature()), "-XDforcePreview" };
if (!CompilerUtils.compile(sourceFile, CLASSES_DIR, options)) {
throw new RuntimeException("Compilation of the test failed: " + sourceFile);
}
byte[] bytes = Files.readAllBytes(CLASSES_DIR.resolve("HiddenInterface.class"));
var dis = new DataInputStream(new ByteArrayInputStream(bytes));
dis.skipBytes(4); // 0xCAFEBABE
assertEquals(65535, dis.readUnsignedShort()); // Minor version
assertThrows(UnsupportedClassVersionError.class, () -> MethodHandles.lookup().defineHiddenClass(bytes, false));
}
}