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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/jdk/java/lang/management/MemoryMXBean/Pending.java Normal file
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/*
* Copyright (c) 2003, 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
* @bug 4530538
* @summary Basic unit test of
* RuntimeMXBean.getObjectPendingFinalizationCount()
* 1. GC and runFinalization() to get the current pending number
* 2. Create some number of objects with reference and without ref.
* 3. Clear all the references
* 4. GC and runFinalization() and the finalizable objects should
* be garbage collected.
* @author Alexei Guibadoulline and Mandy Chung
*
* @modules java.base/jdk.internal.misc
* java.management
*
* @run main Pending
*/
import java.lang.management.*;
public class Pending {
static final int NO_REF_COUNT = 600;
static final int REF_COUNT = 500;
static final int TOTAL_FINALIZABLE = (NO_REF_COUNT + REF_COUNT);
private static int finalized = 0;
private static MemoryMXBean mbean
= ManagementFactory.getMemoryMXBean();
private static final String INDENT = " ";
private static void printFinalizerInstanceCount() {
if (!trace) return;
int count = jdk.internal.misc.VM.getFinalRefCount();
System.out.println(INDENT + "Finalizable object Count = " + count);
count = jdk.internal.misc.VM.getPeakFinalRefCount();
System.out.println(INDENT + "Peak Finalizable object Count = " + count);
}
private static boolean trace = false;
public static void main(String argv[]) throws Exception {
if (argv.length > 0 && argv[0].equals("trace")) {
trace = true;
}
try {
if (trace) {
// Turn on verbose:gc to track GC
mbean.setVerbose(true);
}
test();
} finally {
if (trace) {
mbean.setVerbose(false);
}
}
System.out.println("Test passed.");
}
// Keep objs public so the optimizer will not remove them too early.
public static Object[] objs = null;
private static void test() throws Exception {
// Clean the memory and remove all objects that are pending
// finalization
System.gc();
Snapshot snapshot = getSnapshotAfterFinalization();
System.out.println("Number of objects pending for finalization:");
System.out.println(" Before creating object: " + snapshot);
printFinalizerInstanceCount();
// Create objects without saving reference. Should be removed at next GC.
for (int i = 0; i < NO_REF_COUNT; i++) {
new MyObject();
}
snapshot = getSnapshot();
System.out.println(" Afer creating objects with no ref: " + snapshot);
printFinalizerInstanceCount();
// Create objects and save references.
objs = new Object[REF_COUNT];
for (int i = 0; i < REF_COUNT; i++) {
objs[i] = new MyObject();
}
snapshot = getSnapshot();
System.out.println(" Afer creating objects with ref: " + snapshot);
printFinalizerInstanceCount();
// Now check the expected count - GC and runFinalization will be
// invoked.
checkFinalizerCount(NO_REF_COUNT, 0);
// Clean the memory and remove all objects that are pending
// finalization again
objs = null;
snapshot = getSnapshot();
System.out.println("Clear all references finalized = " + snapshot);
printFinalizerInstanceCount();
checkFinalizerCount(TOTAL_FINALIZABLE, NO_REF_COUNT);
snapshot = getSnapshot();
printFinalizerInstanceCount();
// Check the mbean now
if (snapshot.curFinalized != TOTAL_FINALIZABLE) {
throw new RuntimeException("Wrong number of finalized objects "
+ snapshot + ". Expected "
+ TOTAL_FINALIZABLE);
}
if (snapshot.curPending != 0) {
throw new RuntimeException("Wrong number of objects pending "
+ " end = " + snapshot);
}
}
private static void checkFinalizerCount(int expectedTotal, int curFinalized)
throws Exception {
int prevCount = -1;
Snapshot snapshot = getSnapshot();
if (snapshot.curFinalized != curFinalized) {
throw new RuntimeException(
"Unexpected finalized objects: " + snapshot +
" but expected = " + curFinalized);
}
int MAX_GC_LOOP = 6;
for (int i = 1;
snapshot.curFinalized != expectedTotal && i <= MAX_GC_LOOP;
i++) {
System.gc();
snapshot = getSnapshotAfterFinalization();
if (snapshot.curFinalized == expectedTotal &&
snapshot.curPending != 0) {
throw new RuntimeException(
"Unexpected current number of objects pending for " +
"finalization: " + snapshot + " but expected = 0");
}
System.out.println(" After runFinalization " + i + ": " + snapshot);
printFinalizerInstanceCount();
try {
Thread.sleep(1000);
} catch (Exception e) {
throw e;
}
}
if (snapshot.curFinalized != expectedTotal) {
throw new RuntimeException(
"Unexpected current number of objects pending for " +
"finalization: " + snapshot + " but expected > 0");
}
}
private static Object lock = new Object();
private static class MyObject {
Object[] dummy = new Object[10];
public void finalize () {
synchronized (lock) {
finalized++;
}
}
}
static class Snapshot {
public int curFinalized;
public int curPending;
Snapshot(int f, int p) {
curFinalized = f;
curPending = p;
}
public String toString() {
return "Current finalized = " + curFinalized +
" Current pending = " + curPending;
}
}
private static Snapshot getSnapshot() {
synchronized (lock) {
int curCount = mbean.getObjectPendingFinalizationCount();
return new Snapshot(finalized, curCount);
}
}
// Repeat getSnapshot until no pending finalization.
private static Snapshot getSnapshotAfterFinalization() throws Exception {
int loopCount = 0;
Snapshot snapshot = null;
while (loopCount < 100) {
Runtime.getRuntime().runFinalization();
Thread.sleep(50);
snapshot = getSnapshot();
if (snapshot.curPending == 0) {
return snapshot;
}
++loopCount;
System.out.println("Waiting for curPending to be 0. snapshot=" + snapshot);
}
String msg = "Objects pending finalization is not 0. snapshot=%s";
throw new RuntimeException(String.format(msg, snapshot));
}
}