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/hotspot/jtreg/runtime/lockStack/TestLockStackCapacity.java
+++ b/test/hotspot/jtreg/runtime/lockStack/TestLockStackCapacity.java
@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2024, 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 TestLockStackCapacity
+ * @summary Tests the interaction between recursive fast locking and
+ *          when the lock stack capacity is exceeded.
+ * @requires vm.flagless
+ * @library /testlibrary /test/lib
+ * @build jdk.test.whitebox.WhiteBox
+ * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xint TestLockStackCapacity
+ */
+
+import jdk.test.lib.Asserts;
+import jdk.test.whitebox.WhiteBox;
+import jtreg.SkippedException;
+
+public class TestLockStackCapacity {
+    static final WhiteBox WB = WhiteBox.getWhiteBox();
+
+    static class SynchronizedObject {
+        static final SynchronizedObject OUTER = new SynchronizedObject();
+        static final SynchronizedObject INNER = new SynchronizedObject();
+        static final int LockStackCapacity = WB.getLockStackCapacity();
+
+        synchronized void runInner(int depth) {
+            assertNotInflated();
+            if (depth == 1) {
+                return;
+            } else {
+                runInner(depth - 1);
+            }
+            assertNotInflated();
+        }
+
+        synchronized void runOuter(int depth, SynchronizedObject inner) {
+            assertNotInflated();
+            if (depth == 1) {
+                inner.runInner(LockStackCapacity);
+            } else {
+                runOuter(depth - 1, inner);
+            }
+            assertInflated();
+        }
+
+        public static void runTest() {
+            // Test Requires a capacity of at least 2.
+            Asserts.assertGTE(LockStackCapacity, 2);
+
+            // Just checking
+            OUTER.assertNotInflated();
+            INNER.assertNotInflated();
+
+            synchronized(OUTER) {
+                OUTER.assertNotInflated();
+                INNER.assertNotInflated();
+                OUTER.runOuter(LockStackCapacity - 1, INNER);
+
+                OUTER.assertInflated();
+                INNER.assertNotInflated();
+            }
+        }
+
+        void assertNotInflated() {
+            Asserts.assertFalse(WB.isMonitorInflated(this));
+        }
+
+        void assertInflated() {
+            Asserts.assertTrue(WB.isMonitorInflated(this));
+        }
+    }
+
+    public static void main(String... args) throws Exception {
+        if (!WB.supportsRecursiveFastLocking()) {
+            throw new SkippedException("Test only valid if fast locking supports recursion");
+        }
+
+        SynchronizedObject.runTest();
+    }
+}