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/foreign/TestDeadlock.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2023, 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 id=Arena_allocateFrom
+ * @run main/othervm/timeout=60 --enable-native-access=ALL-UNNAMED -Xlog:class+init TestDeadlock Arena
+ */
+
+/*
+ * @test id=FileChannel_map
+ * @run main/othervm/timeout=60 --enable-native-access=ALL-UNNAMED -Xlog:class+init TestDeadlock FileChannel
+ */
+
+import java.lang.foreign.*;
+import java.io.IOException;
+import java.nio.channels.FileChannel;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+import java.util.concurrent.CountDownLatch;
+
+public class TestDeadlock {
+    public static void main(String[] args) throws Throwable {
+        CountDownLatch latch = new CountDownLatch(2);
+
+        Runnable tester = switch (args[0]) {
+            case "Arena" -> () -> {
+                Arena arena = Arena.global();
+                arena.scope(); // init ArenaImpl
+                ValueLayout.JAVA_INT.byteSize(); // init ValueLayout (and impls)
+                latch.countDown();
+                try {
+                    latch.await();
+                } catch(InterruptedException e) {
+                    throw new RuntimeException(e);
+                }
+
+                // Access ArenaImpl -> NativeMemorySegmentImpl -> MemorySegment
+                arena.allocateFrom(ValueLayout.JAVA_INT, 42);
+            };
+            case "FileChannel" -> () -> {
+                try {
+                    Arena arena = Arena.global();
+                    Path p = Files.createFile(Path.of("test.out"));
+
+                    try (FileChannel channel = FileChannel.open(p, StandardOpenOption.READ, StandardOpenOption.WRITE)) {
+                        channel.map(FileChannel.MapMode.READ_WRITE, 0, 4); // create MappedByteBuffer to initialize other things
+                        latch.countDown();
+                        latch.await();
+
+                        // Access MappedMemorySegmentImpl -> MemorySegment
+                        channel.map(FileChannel.MapMode.READ_WRITE, 0, 4, arena);
+                    }
+                } catch(InterruptedException | IOException e) {
+                    throw new RuntimeException(e);
+                }
+            };
+            default -> throw new IllegalArgumentException("Unknown test selection: " + args[0]);
+        };
+
+        Thread t1 = Thread.ofPlatform().start(tester);
+        Thread t2 = Thread.ofPlatform().start(() -> {
+            latch.countDown();
+            try {
+                latch.await();
+            } catch(InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+
+            // Access MemorySegment -> NativeMemorySegmentImpl
+            MemorySegment.ofAddress(42);
+        });
+
+        // wait for potential deadlock
+
+        t1.join();
+        t2.join();
+
+        // all good
+    }
+}