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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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104
test/hotspot/jtreg/runtime/ClassFile/ClassFileVersionTest.java Normal file
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/*
* Copyright (c) 2022, 2025, 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 8291360
* @summary Test getting the class file version for java.lang.Class API
* @library /test/lib
* @modules java.base/java.lang:open
* @compile classFileVersions.jcod
* @run main/othervm --enable-preview ClassFileVersionTest
*/
import java.lang.classfile.ClassFile;
import java.lang.constant.ClassDesc;
import java.lang.reflect.*;
import jdk.test.lib.ByteCodeLoader;
public class ClassFileVersionTest {
public static final int LOWER_16 = 0x0000_FFFF;
static Method m;
public static void testIt(String className, int expectedResult) throws Exception {
testIt(Class.forName(className), expectedResult);
}
public static void testIt(Class<?> testClass, int expectedResult) throws Exception {
int ver = (int)m.invoke(testClass);
if (ver != expectedResult) {
int exp_minor = (expectedResult >> 16) & LOWER_16;
int exp_major = expectedResult & LOWER_16;
int got_minor = (ver >> 16) & LOWER_16;
int got_major = ver & LOWER_16;
throw new RuntimeException(
"Expected " + exp_minor + ":" + exp_major + " but got " + got_minor + ":" + got_major);
}
}
public static void main(String argv[]) throws Throwable {
Class<?> cl = java.lang.Class.class;
m = cl.getDeclaredMethod("getClassFileVersion", new Class[0]);
m.setAccessible(true);
int latestMajor = ClassFileFormatVersion.latest().major();
testIt(Object.class, latestMajor);
Class<?> previewClass = ByteCodeLoader.load("PreviewClass", ClassFile.of().build(ClassDesc.of("PreviewClass"),
clb -> clb.withVersion(ClassFile.latestMajorVersion(), ClassFile.PREVIEW_MINOR_VERSION)));
testIt(previewClass, (~LOWER_16) | latestMajor);
testIt("Version64", 64);
testIt("Version59", 59);
testIt("Version45_3", 0x0003_002D); // 3:45
// test primitive array. should return latest version.
int ver = (int)m.invoke((new int[3]).getClass());
if (ver != latestMajor) {
int got_minor = (ver >> 16) & LOWER_16;
int got_major = ver & LOWER_16;
throw new RuntimeException(
"Expected 0:" + latestMajor + ", but got " + got_minor + ":" + got_major + " for primitive array");
}
// test object array. should return class file version of component.
ver = (int)m.invoke((new Version59[2]).getClass());
if (ver != 59) {
int got_minor = (ver >> 16) & LOWER_16;
int got_major = ver & LOWER_16;
throw new RuntimeException(
"Expected 0:59, but got " + got_minor + ":" + got_major + " for object array");
}
// test multi-dimensional object array. should return class file version of component.
ver = (int)m.invoke((new Version59[3][2]).getClass());
if (ver != 59) {
int got_minor = (ver >> 16) & LOWER_16;
int got_major = ver & LOWER_16;
throw new RuntimeException(
"Expected 0:59, but got " + got_minor + ":" + got_major + " for object array");
}
}
}