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/nio/Buffer/AllocateDirectInit.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2001, 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
+ * @bug 4490253 6535542 8357959
+ * @key randomness
+ * @library /test/lib
+ * @build jdk.test.lib.RandomFactory
+ * @summary Verify that newly allocated direct buffers are initialized.
+ * @run main/othervm AllocateDirectInit
+ */
+
+import java.nio.ByteBuffer;
+import java.util.Random;
+
+import jdk.test.lib.RandomFactory;
+
+public class AllocateDirectInit {
+    private static final int MAX_BIN_LIMIT = 16 * 1024 * 1024;
+    private static final int MAX_DEC_LIMIT = 10 * 1000 * 1000;
+    private static final int TRIES_PER_LIMIT = 1024;
+
+    private static final Random RND = RandomFactory.getRandom();
+
+    public static void main(String [] args){
+        // Try power of two limits
+        for (int limit = 1; limit < MAX_BIN_LIMIT; limit *= 2) {
+            check(ByteBuffer.allocateDirect(limit - 1));
+            check(ByteBuffer.allocateDirect(limit));
+            check(ByteBuffer.allocateDirect(limit + 1));
+        }
+
+        // Try power of ten limits
+        for (int limit = 1; limit < MAX_DEC_LIMIT; limit *= 10) {
+            check(ByteBuffer.allocateDirect(limit - 1));
+            check(ByteBuffer.allocateDirect(limit));
+            check(ByteBuffer.allocateDirect(limit + 1));
+        }
+
+        // Try random sizes within power of two limits
+        for (int limit = 1; limit < MAX_BIN_LIMIT; limit *= 2) {
+            for (int t = 0; t < TRIES_PER_LIMIT; t++) {
+                check(ByteBuffer.allocateDirect(RND.nextInt(limit)));
+            }
+        }
+    }
+
+    private static void check(ByteBuffer bb) {
+        while (bb.hasRemaining()) {
+            if (bb.get() != 0) {
+                int mismatchPos = bb.position();
+                System.out.print("byte [");
+                for (bb.position(0); bb.position() < bb.limit(); ) {
+                    System.out.print(" " + Integer.toHexString(bb.get() & 0xff));
+                }
+                System.out.println(" ]");
+                throw new RuntimeException("uninitialized buffer, position = " + mismatchPos);
+            }
+        }
+    }
+}