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/Chars.java

@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2013, 2026, 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 8014854
+ * @summary Exercises CharBuffer#chars on each of the CharBuffer types
+ * @run junit Chars
+ * @key randomness
+ */
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.CharBuffer;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Chars {
+
+    static final Random RAND = new Random();
+
+    static final int SIZE = 128 + RAND.nextInt(1024);
+
+    /**
+     * Randomize the char buffer's position and limit.
+     */
+    static CharBuffer randomizeRange(CharBuffer cb) {
+        int mid = cb.capacity() >>> 1;
+        int start = RAND.nextInt(mid + 1); // from 0 to mid
+        int end = mid + RAND.nextInt(cb.capacity() - mid + 1); // from mid to capacity
+        cb.position(start);
+        cb.limit(end);
+        return cb;
+    }
+
+    /**
+     * Randomize the char buffer's contents, position and limit.
+     */
+    static CharBuffer randomize(CharBuffer cb) {
+        while (cb.hasRemaining()) {
+            cb.put((char)RAND.nextInt());
+        }
+        return randomizeRange(cb);
+    }
+
+    /**
+     * Sums the remaining chars in the char buffer.
+     */
+    static int intSum(CharBuffer cb) {
+        int sum = 0;
+        cb.mark();
+        while (cb.hasRemaining()) {
+            sum += cb.get();
+        }
+        cb.reset();
+        return sum;
+    }
+
+    /**
+     * Creates char buffers to test, adding them to the given list.
+     */
+    static void addCases(CharBuffer cb, List<CharBuffer> buffers) {
+        randomize(cb);
+        buffers.add(cb);
+
+        buffers.add(cb.slice());
+        buffers.add(cb.duplicate());
+        buffers.add(cb.asReadOnlyBuffer());
+
+        buffers.add(randomizeRange(cb.slice()));
+        buffers.add(randomizeRange(cb.duplicate()));
+        buffers.add(randomizeRange(cb.asReadOnlyBuffer()));
+    }
+
+    private static Stream<Arguments> createCharBuffers() {
+        List<CharBuffer> buffers = new ArrayList<>();
+
+        // heap
+        addCases(CharBuffer.allocate(SIZE), buffers);
+        addCases(CharBuffer.wrap(new char[SIZE]), buffers);
+        addCases(ByteBuffer.allocate(SIZE*2).order(ByteOrder.BIG_ENDIAN).asCharBuffer(),
+                 buffers);
+        addCases(ByteBuffer.allocate(SIZE*2).order(ByteOrder.LITTLE_ENDIAN).asCharBuffer(),
+                 buffers);
+
+        // direct
+        addCases(ByteBuffer.allocateDirect(SIZE*2).order(ByteOrder.BIG_ENDIAN).asCharBuffer(),
+                 buffers);
+        addCases(ByteBuffer.allocateDirect(SIZE*2).order(ByteOrder.LITTLE_ENDIAN).asCharBuffer(),
+                 buffers);
+
+        // read-only buffer backed by a CharSequence
+        buffers.add(CharBuffer.wrap(randomize(CharBuffer.allocate(SIZE))));
+
+        List<Arguments> params = new ArrayList<Arguments>();
+        for (int i = 0; i < buffers.size(); i++) {
+            CharBuffer cb = buffers.get(i);
+            params.add((Arguments.of(cb.getClass().getName(), cb)));
+        }
+
+        return params.stream();
+    }
+
+    @ParameterizedTest
+    @MethodSource("createCharBuffers")
+    public void testChars(String type, CharBuffer cb) {
+        System.err.format("%s position=%d, limit=%d%n", type, cb.position(), cb.limit());
+        int expected = intSum(cb);
+        assertEquals(expected, cb.chars().sum());
+        assertEquals(expected, cb.chars().parallel().sum());
+    }
+}