undefect. CWE-407 — 63 sites patched across 27 ecosystems

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.
2026-03-26 17:11:57 -04:00 · 2026-03-26 17:11:57 -04:00 · 0a580b313d
commit 0a580b313d
70422 changed files with 17213626 additions and 0 deletions
--- a/test/hotspot/jtreg/serviceability/threads/ThreadInfoTest.java
+++ b/test/hotspot/jtreg/serviceability/threads/ThreadInfoTest.java
@ -0,0 +1,187 @@
+/*
+ * Copyright (c) 2026, 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.
+ */
+
+import jdk.test.lib.Utils;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.ThreadInfo;
+import java.lang.management.ThreadMXBean;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/*
+ * @test
+ * @bug 8323792
+ * @summary Make sure that jmm_GetThreadInfo() call does not crash JVM
+ * @library /test/lib
+ * @modules java.management
+ * @run main/othervm ThreadInfoTest
+ *
+ * @comment Exercise getThreadInfo(ids, 0).  Depth parameter of zero means
+ * no VM operation, which could crash with Threads starting and ending.
+ */
+
+public class ThreadInfoTest {
+    private static com.sun.management.ThreadMXBean mbean =
+        (com.sun.management.ThreadMXBean)ManagementFactory.getThreadMXBean();
+
+    private static final int NUM_THREADS = 2;
+    static long[] ids = new long[NUM_THREADS];
+    static ThreadInfo[] infos = new ThreadInfo[NUM_THREADS];
+    static volatile int count = 0;
+    static int ITERATIONS = 4;
+
+    public static void main(String[] argv) throws Exception {
+        boolean replacing = false;
+
+        startThreads(ids, NUM_THREADS);
+        new MyGetThreadInfoThread(ids).start();
+        new MyReplacerThread(ids).start();
+        for (int i = 0; i < ITERATIONS; i++) {
+            do {
+                count = countInfo(infos);
+                System.out.println("Iteration " + i + ": ThreadInfos found (Threads alive): " + count);
+                goSleep(100);
+            } while (count > 0);
+        }
+    }
+
+    private static Thread newThread(int i) {
+        Thread thread = new MyThread(i);
+        thread.setDaemon(true);
+        return thread;
+    }
+
+   private static void startThreads(long[] ids, int count) {
+        System.out.println("Starting " + count + " Threads...");
+        Thread[] threads = new Thread[count];
+        for (int i = 0; i < count; i++) {
+            threads[i] = newThread(i);
+            threads[i].start();
+            ids[i] = threads[i].getId();
+        }
+        System.out.println(ids);
+    }
+
+    // Count ThreadInfo from array, return how many are non-null.
+    private static int countInfo(ThreadInfo[] info) {
+        int count = 0;
+        if (info != null) {
+            int i = 0;
+            for (ThreadInfo ti: info) {
+                if (ti != null) {
+                    count++;
+                }
+                i++;
+            }
+        }
+        return count;
+    }
+
+    private static int replaceThreads(long[] ids, ThreadInfo[] info) {
+        int replaced = 0;
+        if (info != null) {
+            for (int i = 0; i < info.length; i++) {
+                ThreadInfo ti = info[i];
+                if (ti == null) {
+                    Thread thread = newThread(i);
+                    thread.start();
+                    ids[i] = thread.getId();
+                    replaced++;
+                }
+            }
+        }
+        return replaced;
+    }
+
+    private static void goSleep(long ms) {
+        try {
+            Thread.sleep(ms);
+        } catch (InterruptedException e) {
+            System.out.println("Unexpected exception is thrown: " + e);
+        }
+    }
+
+    // A Thread which replaces Threads in the shared array of threads.
+    static class MyReplacerThread extends Thread {
+        long[] ids;
+
+        public MyReplacerThread(long[] ids) {
+            this.ids = ids;
+            this.setDaemon(true);
+        }
+
+        public void run() {
+            boolean replacing = false;
+            while (true) {
+                if (replacing) {
+                    replaceThreads(ids, infos);
+                }
+                if (count < 10) {
+                    replacing = true;
+                }
+                if (count > 20) {
+                    replacing = false;
+                }
+                goSleep(1);
+            }
+        }
+    }
+
+    // A Thread which lives for a short while.
+    static class MyThread extends Thread {
+        long endTimeMs;
+
+        public MyThread(long n) {
+            super("MyThread-" + n);
+            endTimeMs = (n * n * 10) + System.currentTimeMillis();
+        }
+
+        public void run() {
+            try {
+                long sleep = Math.max(1, endTimeMs - System.currentTimeMillis());
+                goSleep(sleep);
+            } catch (Exception e) {
+                System.out.println(Thread.currentThread().getName() + ": " + e);
+            }
+        }
+    }
+
+    // A Thread to continually call getThreadInfo on a shared array of thread ids.
+    static class MyGetThreadInfoThread extends Thread {
+        long[] ids;
+
+        public MyGetThreadInfoThread(long[] ids) {
+            this.ids = ids;
+            this.setDaemon(true);
+        }
+
+        public void run() {
+            while (true) {
+                infos = mbean.getThreadInfo(ids, 0);
+                goSleep(10);
+            }
+        }
+    }
+}