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/jdk/java/foreign/TestBufferStackStress.java
+++ b/test/jdk/java/foreign/TestBufferStackStress.java
@ -0,0 +1,72 @@
+/*
+ * 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.
+ */
+
+/*
+ * @test
+ * @modules java.base/jdk.internal.foreign
+ * @build NativeTestHelper TestBufferStackStress
+ * @run junit TestBufferStackStress
+ */
+
+import jdk.internal.foreign.BufferStack;
+import org.junit.jupiter.api.Test;
+
+import java.lang.foreign.Arena;
+import java.lang.foreign.MemorySegment;
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.stream.IntStream;
+
+import static java.lang.foreign.ValueLayout.*;
+import static java.time.temporal.ChronoUnit.SECONDS;
+import static org.junit.jupiter.api.Assertions.*;
+
+public class TestBufferStackStress {
+
+    @Test
+    public void stress() throws InterruptedException {
+        BufferStack stack = BufferStack.of(256, 1);
+        Thread[] vThreads = IntStream.range(0, 1024).mapToObj(_ ->
+                Thread.ofVirtual().start(() -> {
+                    long threadId = Thread.currentThread().threadId();
+                    while (!Thread.interrupted()) {
+                        for (int i = 0; i < 1_000_000; i++) {
+                            try (Arena arena = stack.pushFrame(JAVA_LONG.byteSize(), JAVA_LONG.byteAlignment())) {
+                                // Try to assert no two vThreads get allocated the same stack space.
+                                MemorySegment segment = arena.allocate(JAVA_LONG);
+                                JAVA_LONG.varHandle().setVolatile(segment, 0L, threadId);
+                                assertEquals(threadId, (long) JAVA_LONG.varHandle().getVolatile(segment, 0L));
+                            }
+                        }
+                        Thread.yield(); // make sure the driver thread gets a chance.
+                    }
+                })).toArray(Thread[]::new);
+        Thread.sleep(Duration.of(10, SECONDS));
+        Arrays.stream(vThreads).forEach(
+                thread -> {
+                    assertTrue(thread.isAlive());
+                    thread.interrupt();
+                });
+    }
+
+}