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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/hotspot/jtreg/compiler/classUnloading/methodUnloading/TestMethodUnloading.java Normal file
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/*
* Copyright (c) 2014, 2022, 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 MethodUnloadingTest
* @bug 8029443
* @summary Tests the unloading of methods to to class unloading
* @modules java.base/jdk.internal.misc
* @library /test/lib /
*
* @build jdk.test.whitebox.WhiteBox
* compiler.classUnloading.methodUnloading.WorkerClass
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions
* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
* -XX:-BackgroundCompilation -XX:-UseCompressedOops
* -XX:CompileCommand=compileonly,compiler.classUnloading.methodUnloading.TestMethodUnloading::doWork
* compiler.classUnloading.methodUnloading.TestMethodUnloading
*/
package compiler.classUnloading.methodUnloading;
import jdk.test.whitebox.WhiteBox;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import compiler.whitebox.CompilerWhiteBoxTest;
public class TestMethodUnloading {
private static final String workerClassName = "compiler.classUnloading.methodUnloading.WorkerClass";
private static int work = -1;
private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
/**
* Does some work by either using the workerClass or locally producing values.
* @param workerClass Class performing some work (will be unloaded)
* @param useWorker If true the workerClass is used
*/
static private void doWork(Class<?> workerClass, boolean useWorker) throws InstantiationException, IllegalAccessException {
if (useWorker) {
// Create a new instance
Object worker = workerClass.newInstance();
// We would like to call a method of WorkerClass here but we cannot cast to WorkerClass
// because the class was loaded by a different class loader. One solution would be to use
// reflection but since we want C2 to implement the call as an optimized IC we call
// Object::hashCode() here which actually calls WorkerClass::hashCode().
// C2 will then implement this call as an optimized IC that points to a to-interpreter stub
// referencing the Method* for WorkerClass::hashCode().
work = worker.hashCode();
if (work != 42) {
new RuntimeException("Work not done");
}
} else {
// Do some important work here
work = 1;
}
}
/**
* Makes sure that method is compiled by forcing compilation if not yet compiled.
* @param m Method to be checked
*/
static private void makeSureIsCompiled(Method m) {
// Make sure background compilation is disabled
if (WHITE_BOX.getBooleanVMFlag("BackgroundCompilation")) {
throw new RuntimeException("Background compilation enabled");
}
// Check if already compiled
if (!WHITE_BOX.isMethodCompiled(m)) {
// If not, try to compile it with C2
if(!WHITE_BOX.enqueueMethodForCompilation(m, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION)) {
// C2 compiler not available, try to compile with C1
WHITE_BOX.enqueueMethodForCompilation(m, CompilerWhiteBoxTest.COMP_LEVEL_SIMPLE);
}
// Because background compilation is disabled, method should now be compiled
if(!WHITE_BOX.isMethodCompiled(m)) {
throw new RuntimeException(m + " not compiled");
}
}
}
/**
* This test creates stale Method* metadata in a to-interpreter stub of an optimized IC.
*
* The following steps are performed:
* (1) A workerClass is loaded by a custom class loader
* (2) The method doWork that calls a method of the workerClass is compiled. The call
* is implemented as an optimized IC calling a to-interpreted stub. The to-interpreter
* stub contains a Method* to a workerClass method.
* (3) Unloading of the workerClass is enforced. The to-interpreter stub now contains a dead Method*.
* (4) Depending on the implementation of the IC, the compiled version of doWork should still be
* valid. We call it again without using the workerClass.
*/
static public void main(String[] args) throws Exception {
// (1) Create a custom class loader with no parent class loader
URL url = TestMethodUnloading.class.getProtectionDomain().getCodeSource().getLocation();
URLClassLoader loader = new URLClassLoader(new URL[] {url}, null);
// Load worker class with custom class loader
Class<?> workerClass = Class.forName(workerClassName, true, loader);
// (2) Make sure all paths of doWork are profiled and compiled
for (int i = 0; i < 100000; ++i) {
doWork(workerClass, true);
doWork(workerClass, false);
}
// Make sure doWork is compiled now
Method doWork = TestMethodUnloading.class.getDeclaredMethod("doWork", Class.class, boolean.class);
makeSureIsCompiled(doWork);
// (3) Throw away class loader and reference to workerClass to allow unloading
loader.close();
loader = null;
workerClass = null;
// Force garbage collection to trigger unloading of workerClass
// Dead reference to WorkerClass::hashCode triggers JDK-8029443
WHITE_BOX.fullGC();
// (4) Depending on the implementation of the IC, the compiled version of doWork
// may still be valid here. Execute it without a workerClass.
doWork(null, false);
if (work != 1) {
throw new RuntimeException("Work not done");
}
doWork(Object.class, false);
}
}