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/java/lang/StackWalker/CallerFromMain.java

@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2015, 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 8140450
+ * @summary Test if the getCallerClass method returns empty optional
+ * @requires test.thread.factory == null
+ * @library /test/lib
+ * @run main CallerFromMain exec
+ */
+
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.process.OutputAnalyzer;
+
+public class CallerFromMain {
+
+    private static final StackWalker sw = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
+    public static void main(String[] args) throws Exception {
+        if (args.length > 0) {
+            ProcessBuilder pb = ProcessTools.createTestJavaProcessBuilder("CallerFromMain");
+            OutputAnalyzer output = ProcessTools.executeProcess(pb);
+            System.out.println(output.getOutput());
+            output.shouldHaveExitValue(0);
+            return;
+        }
+
+        // StackWalker::getCallerClass
+        // CallerFromMain::main
+        // no caller
+        try {
+            Class<?> c = sw.getCallerClass();
+            throw new RuntimeException("UOE not thrown. Caller: " + c);
+        } catch (IllegalCallerException e) {}
+
+        // StackWalker::getCallerClass
+        // Runnable::run
+        // Thread::run
+        Thread t1 = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                Class<?> c = sw.getCallerClass();
+                System.out.println("Call from Thread.run: " + c);
+                assertThreadClassAsCaller(c);
+            }
+        });
+        t1.setDaemon(true);
+        t1.start();
+
+        // StackWalker::getCallerClass
+        // CallerFromMain::doit
+        // Thread::run
+        Thread t2 = new Thread(CallerFromMain::doit);
+        t2.setDaemon(true);
+        t2.start();
+
+        // StackWalker::getCallerClass
+        // MyRunnable::run
+        // Thread::run
+        Thread t3 = new Thread(new MyRunnable());
+        t3.setDaemon(true);
+        t3.start();
+
+        // StackWalker::getCallerClass
+        // Runnable::run
+        // MyThread::run
+        Thread t4 = new MyThread(new Runnable() {
+            @Override
+            public void run() {
+                Class<?> c = sw.getCallerClass();
+                System.out.println("Call from MyThread.run: " + c);
+                if (c != MyThread.class) {
+                    throw new RuntimeException("Expected MyThread.class but got " + c);
+                }
+            }
+        });
+        t4.setDaemon(true);
+        t4.start();
+
+        t1.join();
+        t2.join();
+        t3.join();
+        t4.join();
+    }
+
+    static class MyThread extends Thread {
+        final Runnable runnable;
+        MyThread(Runnable runnable) {
+            super("MyThread");
+            this.runnable = runnable;
+        }
+        public void run() {
+            runnable.run();
+        }
+    }
+
+    static class MyRunnable implements Runnable {
+        @Override
+        public void run() {
+            Class<?> c = sw.getCallerClass();
+            System.out.println("Call from Thread::run: " + c);
+            assertThreadClassAsCaller(c);
+        }
+     }
+
+    static void doit() {
+        Class<?> c = sw.getCallerClass();
+        System.out.println("Call from CallerFromMain.doit: " + c);
+        assertThreadClassAsCaller(c);
+    }
+
+    static void assertThreadClassAsCaller(Class<?> caller) {
+        if (caller != Thread.class) {
+            throw new RuntimeException("Expected Thread.class but got " + caller);
+        }
+    }
+}