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.

test/jdk/sun/tools/jhsdb/JStackStressTest.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2021, 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.
+ */
+
+/**
+ * @test
+ * @bug 8262271
+ * @requires vm.hasSA
+ * @requires vm.gc != "Z"
+ * @library /test/lib
+ * @run main/timeout=240 JStackStressTest
+ */
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+import jdk.test.lib.JDKToolLauncher;
+import jdk.test.lib.JDKToolFinder;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.SA.SATestUtils;
+import jdk.test.lib.Utils;
+
+public class JStackStressTest {
+
+    static Process jShellProcess;
+
+    public static void testjstack() throws IOException {
+        launchJshell();
+        long jShellPID = jShellProcess.pid();
+        OutputAnalyzer jshellOutput = new OutputAnalyzer(jShellProcess);
+
+        try {
+            // Do 4 jstacks on the jshell process as it starts up
+            for (int i = 1; i <= 4; i++) {
+                JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("jhsdb");
+                launcher.addVMArgs(Utils.getTestJavaOpts());
+                launcher.addToolArg("jstack");
+                launcher.addToolArg("--pid=" + Long.toString(jShellPID));
+
+                System.out.println("###### Starting jstack iteration " + i + " against " + jShellPID);
+                long startTime = System.currentTimeMillis();
+                ProcessBuilder processBuilder = SATestUtils.createProcessBuilder(launcher);
+                OutputAnalyzer output = ProcessTools.executeProcess(processBuilder);
+                System.out.println("jhsdb jstack stdout:");
+                System.out.println(output.getStdout());
+                System.out.println("jhsdb jstack stderr:");
+                System.out.println(output.getStderr());
+                long elapsedTime = System.currentTimeMillis() - startTime;
+                System.out.println("###### End of all output for iteration " + i +
+                                   " which took " + elapsedTime + "ms");
+                output.shouldHaveExitValue(0);
+                // This will detect most SA failures, including during the attach.
+                output.shouldNotMatch("^sun.jvm.hotspot.debugger.DebuggerException:.*$");
+                // This will detect unexpected exceptions, like NPEs and asserts, that are caught
+                // by sun.jvm.hotspot.tools.Tool.execute().
+                output.shouldNotMatch("^Error: .*$");
+            }
+        } catch (Exception ex) {
+            throw new RuntimeException("Test ERROR " + ex, ex);
+        } finally {
+            try (OutputStream out = jShellProcess.getOutputStream()) {
+                out.write("/exit\n".getBytes());
+                out.flush();
+            }
+            try {
+                jShellProcess.waitFor(); // jshell should exit quickly
+            } catch (InterruptedException e) {
+            }
+            System.out.println("jshell Output: " + jshellOutput.getOutput());
+        }
+    }
+
+    public static void launchJshell() throws IOException {
+        System.out.println("Starting Jshell");
+        long startTime = System.currentTimeMillis();
+        try {
+            JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("jshell");
+            launcher.addVMArgs(Utils.getTestJavaOpts());
+            ProcessBuilder pb = new ProcessBuilder(launcher.getCommand());
+            jShellProcess = ProcessTools.startProcess("JShell", pb);
+        } catch (Exception ex) {
+            throw new RuntimeException("Test ERROR " + ex, ex);
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        SATestUtils.skipIfCannotAttach(); // throws SkippedException if attach not expected to work.
+        testjstack();
+
+        // The test throws RuntimeException on error.
+        // IOException is thrown if Jshell can't start because of some bad
+        // environment condition
+        System.out.println("Test PASSED");
+    }
+}