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/hotspot/jtreg/serviceability/attach/EarlyDynamicLoad/EarlyDynamicLoad.java

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+/*
+ * Copyright (c) 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.
+ */
+
+import com.sun.tools.attach.VirtualMachine;
+import com.sun.tools.attach.AgentLoadException;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.AfterAll;
+
+import java.io.File;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.concurrent.TimeUnit;
+import jdk.test.lib.dcmd.PidJcmdExecutor;
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.Utils;
+
+/*
+ * @test EarlyDynamicLoad
+ * @summary Test that dynamic attach fails gracefully when the JVM is not in live phase.
+ * @requires vm.jvmti
+ * @library /test/lib
+ * @run junit EarlyDynamicLoad
+ */
+public class EarlyDynamicLoad {
+    private static final String EXPECTED_MESSAGE = "Dynamic agent loading is only permitted in the live phase";
+
+    private static Process child;
+
+    @BeforeAll
+    static void startAndWaitChild() throws Exception {
+        child = ProcessTools.createTestJavaProcessBuilder(
+                        "-XX:+StartAttachListener",
+                        "-agentpath:" + Utils.TEST_NATIVE_PATH + File.separator + System.mapLibraryName("EarlyDynamicLoad"),
+                        "--version").start();
+
+        // Wait until the process enters VMStartCallback
+        try (InputStream is = child.getInputStream()) {
+            is.read();
+        }
+    }
+
+    @AfterAll
+    static void stopChild() throws Exception {
+        try (OutputStream os = child.getOutputStream()) {
+            os.write(0);
+        }
+
+        if (!child.waitFor(5, TimeUnit.SECONDS)) {
+            child.destroyForcibly();
+            throw new AssertionError("Timed out while waiting child process to complete");
+        }
+
+        OutputAnalyzer analyzer = new OutputAnalyzer(child);
+        analyzer.shouldHaveExitValue(0);
+    }
+
+    @Test
+    public void virtualMachine() throws Exception {
+        try {
+            VirtualMachine vm = VirtualMachine.attach(String.valueOf(child.pid()));
+            vm.loadAgent("some.jar");
+            vm.detach();
+            throw new AssertionError("Should have failed with AgentLoadException");
+        } catch(AgentLoadException exception) {
+            if (!exception.getMessage().contains(EXPECTED_MESSAGE)) {
+                throw new AssertionError("Unexpected error message", exception);
+            }
+        }
+    }
+
+    @Test
+    public void jcmd() throws Exception {
+        PidJcmdExecutor executor = new PidJcmdExecutor(String.valueOf(child.pid()));
+        OutputAnalyzer out = executor.execute("JVMTI.agent_load some.jar");
+
+        out.shouldHaveExitValue(0);
+        out.stdoutShouldContain(EXPECTED_MESSAGE);
+    }
+}