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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.
This commit is contained in:
russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
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test/jdk/com/sun/jdi/ClassUnloadEventTest.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 8256811
* @modules java.base/jdk.internal.misc
* @library /test/lib
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/othervm/native ClassUnloadEventTest run
*/
import jdk.test.lib.classloader.ClassUnloadCommon;
import com.sun.jdi.*;
import com.sun.jdi.connect.*;
import com.sun.jdi.event.*;
import com.sun.jdi.request.*;
import java.util.*;
import java.io.*;
import java.lang.classfile.ClassFile;
import java.lang.constant.ClassDesc;
import java.lang.constant.ConstantDescs;
public class ClassUnloadEventTest {
static final String CLASS_NAME_PREFIX = "SampleClass__";
static final String CLASS_NAME_ALT_PREFIX = CLASS_NAME_PREFIX + "Alt__";
static final int NUM_CLASSES = 10;
static final int NUM_ALT_CLASSES = NUM_CLASSES / 2;
public static void main(String[] args) throws Exception {
if (args.length == 0) {
try {
runDebuggee();
} catch (Exception e) {
e.printStackTrace();
throw e;
}
} else {
runDebugger();
}
}
private static class TestClassLoader extends ClassLoader {
private static byte[] generateSampleClass(String name) {
return ClassFile.of().build(ClassDesc.of(name), clb ->
clb.withVersion(52, 0)
.withFlags(ClassFile.ACC_SUPER | ClassFile.ACC_PUBLIC)
.withMethodBody("m", ConstantDescs.MTD_void, ClassFile.ACC_PUBLIC | ClassFile.ACC_STATIC, cob ->
cob.return_()));
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
if (name.startsWith(CLASS_NAME_PREFIX)) {
byte[] bytecode = generateSampleClass(name);
return defineClass(name, bytecode, 0, bytecode.length);
} else {
return super.findClass(name);
}
}
}
private static void runDebuggee() {
System.out.println("Running debuggee");
ClassLoader loader = new TestClassLoader();
for (int index = 0; index < NUM_CLASSES; index++) {
try {
if (index < NUM_ALT_CLASSES) {
Class.forName(CLASS_NAME_ALT_PREFIX + index, true, loader);
} else {
Class.forName(CLASS_NAME_PREFIX + index, true, loader);
}
} catch (Exception e) {
throw new RuntimeException("Failed to create Sample class", e);
}
}
loader = null;
// Do a short delay to make sure that the debug agent is done processing all
// ClassPrepare events. Otherwise the debug agent might still be holding on to
// a reference to a class, which will prevent it from unloading during the GC.
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
}
// Trigger class unloading
ClassUnloadCommon.triggerUnloading();
// We rely on JVMTI to post all pending ObjectFree events at VM shutdown.
// It will trigger the JDWP agent to synthesize expected ClassUnloadEvents events.
System.out.println("Exiting debuggee");
}
private static void runDebugger() throws Exception {
System.out.println("Running debugger");
HashSet<String> unloadedSampleClasses = new HashSet<>();
HashSet<String> unloadedSampleClasses_alt = new HashSet<>();
VirtualMachine vm = null;
vm = connectAndLaunchVM();
ClassUnloadRequest classUnloadRequest = vm.eventRequestManager().createClassUnloadRequest();
classUnloadRequest.addClassFilter(CLASS_NAME_PREFIX + "*");
classUnloadRequest.enable();
ClassUnloadRequest classUnloadRequest_alt = vm.eventRequestManager().createClassUnloadRequest();
classUnloadRequest_alt.addClassFilter(CLASS_NAME_ALT_PREFIX + "*");
classUnloadRequest_alt.enable();
EventSet eventSet = null;
boolean exited = false;
while (!exited && (eventSet = vm.eventQueue().remove()) != null) {
System.out.println("EventSet: " + eventSet);
for (Event event : eventSet) {
if (event instanceof ClassUnloadEvent) {
String className = ((ClassUnloadEvent)event).className();
// The unloaded class should always match CLASS_NAME_PREFIX.
if (className.indexOf(CLASS_NAME_PREFIX) == -1) {
throw new RuntimeException("FAILED: Unexpected unloaded class: " + className);
}
// Unloaded classes with ALT names should only occur on the classUnloadRequest_alt.
if (event.request() == classUnloadRequest_alt) {
unloadedSampleClasses_alt.add(className);
if (className.indexOf(CLASS_NAME_ALT_PREFIX) == -1) {
throw new RuntimeException("FAILED: non-alt class unload event for classUnloadRequest_alt.");
}
} else {
unloadedSampleClasses.add(className);
}
// If the unloaded class matches the ALT prefix, then we should have
// unload events in this EventSet for each of the two ClassUnloadRequesta.
int expectedEventSetSize;
if (className.indexOf(CLASS_NAME_ALT_PREFIX) != -1) {
expectedEventSetSize = 2;
} else {
expectedEventSetSize = 1;
}
if (eventSet.size() != expectedEventSetSize) {
throw new RuntimeException("FAILED: Unexpected eventSet size: " + eventSet.size());
}
}
if (event instanceof VMDeathEvent) {
exited = true;
break;
}
}
eventSet.resume();
}
/* Dump debuggee output. */
Process p = vm.process();
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
BufferedReader err = new BufferedReader(new InputStreamReader(p.getErrorStream()));
String line = in.readLine();
while (line != null) {
System.out.println("stdout: " + line);
line = in.readLine();
}
line = err.readLine();
while (line != null) {
System.out.println("stderr: " + line);
line = err.readLine();
}
if (unloadedSampleClasses.size() != NUM_CLASSES) {
throw new RuntimeException("Wrong number of class unload events: expected " + NUM_CLASSES + " got " + unloadedSampleClasses.size());
}
if (unloadedSampleClasses_alt.size() != NUM_ALT_CLASSES) {
throw new RuntimeException("Wrong number of alt class unload events: expected " + NUM_ALT_CLASSES + " got " + unloadedSampleClasses_alt.size());
}
}
private static VirtualMachine connectAndLaunchVM() throws IOException,
IllegalConnectorArgumentsException,
VMStartException {
LaunchingConnector launchingConnector = Bootstrap.virtualMachineManager().defaultConnector();
Map<String, Connector.Argument> arguments = launchingConnector.defaultArguments();
arguments.get("main").setValue(ClassUnloadEventTest.class.getName());
arguments.get("options").setValue("-Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xlog:class+unload=info -Xlog:gc");
return launchingConnector.launch(arguments);
}
}