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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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115
test/hotspot/jtreg/runtime/Thread/ThreadPriorities.java Normal file
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/*
* Copyright (c) 2012, 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 7194254
* @summary Creates several threads with different java priorities and checks
* whether jstack reports correct priorities for them.
*
* @library /test/lib
* @modules java.base/jdk.internal.misc
* java.management
* @comment Use othervm mode so that we don't capture unrelated threads created by other tests
* @run main/othervm ThreadPriorities
*/
import java.util.ArrayList;
import java.util.concurrent.CyclicBarrier;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.JDKToolFinder;
import static jdk.test.lib.Asserts.*;
public class ThreadPriorities {
public static void main(String[] args) throws Throwable {
final int NUMBER_OF_JAVA_PRIORITIES =
Thread.MAX_PRIORITY - Thread.MIN_PRIORITY + 1;
final CyclicBarrier barrier =
new CyclicBarrier(NUMBER_OF_JAVA_PRIORITIES + 1);
for (int p = Thread.MIN_PRIORITY; p <= Thread.MAX_PRIORITY; ++p) {
final int priority = p;
new Thread("Priority=" + p) {
{
setPriority(priority);
}
public void run() {
try {
barrier.await(); // 1st
barrier.await(); // 2nd
} catch (Exception exc) {
// ignore
}
}
}.start();
}
barrier.await(); // 1st
int matches = 0;
ArrayList<String> failed = new ArrayList<>();
ProcessBuilder pb = new ProcessBuilder(
JDKToolFinder.getJDKTool("jstack"),
// jstack output may be lengthy, disable streaming output to avoid deadlocks
"-J-Djdk.attach.allowStreamingOutput=false",
String.valueOf(ProcessTools.getProcessId()));
String[] output = new OutputAnalyzer(pb.start()).getOutput().split("\\R");
Pattern pattern = Pattern.compile(
"\\\"Priority=(\\d+)\\\".* prio=(\\d+).*");
for (String line : output) {
Matcher matcher = pattern.matcher(line);
if (matcher.matches()) {
matches += 1;
String expected = matcher.group(1);
String actual = matcher.group(2);
if (!expected.equals(actual)) {
failed.add(line);
}
}
}
barrier.await(); // 2nd
barrier.reset();
boolean success = false;
try {
assertEquals(matches, NUMBER_OF_JAVA_PRIORITIES);
assertTrue(failed.isEmpty(), failed.size() + ":" + failed);
success = true;
}
finally {
if (!success) {
System.out.println("Failure detected - dumping jstack output:");
for (String line : output) {
System.out.println(line);
}
}
}
}
}