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/channels/Channels/ShortWrite.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2008, 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 6448457
+ * @summary Test Channels.newOutputStream returns OutputStream that handles
+ *     short writes from the underlying channel
+ * @key randomness
+ */
+
+import java.io.OutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.*;
+import java.util.Random;
+
+public class ShortWrite {
+
+    static Random rand = new Random();
+    static int bytesWritten = 0;
+
+    public static void main(String[] args) throws IOException {
+
+        WritableByteChannel wbc = new WritableByteChannel() {
+            public int write(ByteBuffer src) {
+                int rem = src.remaining();
+                if (rem > 0) {
+                    // short write
+                    int n = rand.nextInt(rem) + 1;
+                    src.position(src.position() + n);
+                    bytesWritten += n;
+                    return n;
+                } else {
+                    return 0;
+                }
+            }
+            public void close() throws IOException {
+                throw new RuntimeException("not implemented");
+            }
+            public boolean isOpen() {
+                throw new RuntimeException("not implemented");
+            }
+        };
+
+        // wrap Channel with OutputStream
+        OutputStream out = Channels.newOutputStream(wbc);
+
+
+        // write 100, 99, 98, ... 1
+        // and check that the expected number of bytes is written
+        int expected = 0;
+        byte[] buf = new byte[100];
+        for (int i=0; i<buf.length; i++) {
+            int len = buf.length-i;
+            out.write(buf, i, len);
+            expected += len;
+        }
+        System.out.format("Bytes written: %d, expected: %d\n", bytesWritten,
+            expected);
+        if (bytesWritten != expected)
+            throw new RuntimeException("incorrect number of bytes written");
+
+    }
+}