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/CompressedOops/ObjectAlignment.java
+++ b/test/hotspot/jtreg/runtime/CompressedOops/ObjectAlignment.java
@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2014, 2023, 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 8022865
+ * @summary Tests for the -XX:ObjectAlignmentInBytes command line option
+ * @requires vm.flagless
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ *          java.management
+ * @run driver ObjectAlignment
+ */
+
+import jdk.test.lib.Platform;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.process.OutputAnalyzer;
+
+public class ObjectAlignment {
+
+    public static void main(String[] args) throws Exception {
+
+        if (Platform.is64bit()) {
+            // Minimum alignment should be 8
+            testObjectAlignment(4)
+                .shouldContain("outside the allowed range")
+                .shouldHaveExitValue(1);
+
+            // Alignment has to be a power of 2
+            testObjectAlignment(9)
+                .shouldContain("must be power of 2")
+                .shouldHaveExitValue(1);
+
+            testObjectAlignment(-1)
+                .shouldContain("outside the allowed range")
+                .shouldHaveExitValue(1);
+
+            // Maximum alignment allowed is 256
+            testObjectAlignment(512)
+                .shouldContain("outside the allowed range")
+                .shouldHaveExitValue(1);
+
+            // Valid alignments should work
+            testObjectAlignment(8).shouldHaveExitValue(0);
+            testObjectAlignment(16).shouldHaveExitValue(0);
+            testObjectAlignment(256).shouldHaveExitValue(0);
+
+        } else {
+            // For a 32bit JVM the option isn't there, make sure it's not silently ignored
+            testObjectAlignment(8)
+                .shouldContain("Unrecognized VM option 'ObjectAlignmentInBytes=8'")
+                .shouldHaveExitValue(1);
+        }
+    }
+
+    private static OutputAnalyzer testObjectAlignment(int alignment) throws Exception {
+        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder("-XX:ObjectAlignmentInBytes=" + alignment,
+                                                                             "-version");
+        return new OutputAnalyzer(pb.start());
+    }
+}