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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
commit 0a580b313d
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test/hotspot/jtreg/runtime/ClassUnload/UnloadInterfaceTest.java Normal file
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/*
* Copyright (c) 2018, 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 UnloadInterfaceTest
* @requires vm.opt.final.ClassUnloading
* @modules java.base/jdk.internal.misc
* @library /test/lib
* @compile test/Interface.java
* @compile test/ImplementorClass.java
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xlog:class+unload=trace UnloadInterfaceTest
*/
import jdk.test.whitebox.WhiteBox;
import test.Interface;
import java.lang.ClassLoader;
import jdk.test.lib.classloader.ClassUnloadCommon;
import java.util.List;
import java.util.Set;
/**
* Test that verifies that class unloaded removes the implementor from its the interface that it implements
* via logging.
* [1.364s][info][class,unload] unloading class test.ImplementorClass 0x00000008000a2840
* [1.366s][trace][class,unload] unlinking class (subclass): test.ImplementorClass
* [1.366s][trace][class,unload] unlinking class (implementor): test.ImplementorClass
*/
public class UnloadInterfaceTest {
private static String className = "test.ImplementorClass";
private static String interfaceName = "test.Interface";
static class LoaderToUnload extends ClassLoader {
ClassLoader myParent;
public Class loadClass(String name) throws ClassNotFoundException {
if (name.contains(className)) {
System.out.println("className found " + className);
byte[] data = ClassUnloadCommon.getClassData(name);
return defineClass(name, data, 0, data.length);
} else {
return myParent.loadClass(name);
}
}
public LoaderToUnload(ClassLoader parent) {
super();
myParent = parent;
}
}
public static void main(String... args) throws Exception {
run();
}
private static void run() throws Exception {
final WhiteBox wb = WhiteBox.getWhiteBox();
ClassUnloadCommon.failIf(wb.isClassAlive(className), "is not expected to be alive yet");
// Load interface Class with one class loader.
ClassLoader icl = ClassUnloadCommon.newClassLoader();
Class<?> ic = icl.loadClass(interfaceName);
ClassLoader cl = new LoaderToUnload(icl);
Class<?> c = cl.loadClass(className);
Object o = c.newInstance();
ClassUnloadCommon.failIf(!wb.isClassAlive(className), "should be live here");
ClassUnloadCommon.failIf(!wb.isClassAlive(interfaceName), "should be live here");
cl = null; c = null; o = null;
// Now unload className. This calls triggerUnloading but we only pass the class we expect to be unloaded
// otherwise the test will take too long.
Set<String> aliveClasses = ClassUnloadCommon.triggerUnloading(List.of(className));
ClassUnloadCommon.failIf(!aliveClasses.isEmpty(), "should be unloaded: " + aliveClasses);
ClassUnloadCommon.failIf(!wb.isClassAlive(interfaceName), "should be live here");
System.out.println("We still have Interface referenced" + ic);
}
}