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/MappedByteBuffer/Truncate.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2010, 2012, 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 6934977
+ * @summary Test MappedByteBuffer operations after mapped bye buffer becomes
+ *   inaccessible
+ * @run main/othervm Truncate
+ */
+
+import java.io.*;
+import java.nio.*;
+import java.nio.channels.*;
+import java.util.concurrent.Callable;
+
+public class Truncate {
+
+    static final long INITIAL_FILE_SIZE   = 32000L;
+    static final long TRUNCATED_FILE_SIZE =   512L;
+
+    public static void main(String[] args) throws Exception {
+        File blah = File.createTempFile("blah", null);
+        blah.deleteOnExit();
+
+        final FileChannel fc = new RandomAccessFile(blah, "rw").getChannel();
+        fc.position(INITIAL_FILE_SIZE).write(ByteBuffer.wrap("THE END".getBytes()));
+        final MappedByteBuffer mbb =
+            fc.map(FileChannel.MapMode.READ_WRITE, 0, fc.size());
+        boolean truncated;
+        try {
+            fc.truncate(TRUNCATED_FILE_SIZE);
+            truncated = true;
+        } catch (IOException ioe) {
+            // probably on Windows where a file cannot be truncated when
+            // there is a file mapping.
+            truncated = false;
+        }
+        if (truncated) {
+            // Test 1: access region that is no longer accessible
+            execute(new Callable<Void>() {
+                public Void call() {
+                    mbb.get((int)TRUNCATED_FILE_SIZE + 1);
+                    mbb.put((int)TRUNCATED_FILE_SIZE + 2, (byte)123);
+                    return null;
+                }
+            });
+            // Test 2: load buffer into memory
+            execute(new Callable<Void>() {
+                public Void call() throws IOException {
+                    mbb.load();
+                    return null;
+                }
+            });
+        }
+        fc.close();
+    }
+
+    // Runs the given task in its own thread. If operating correcting the
+    // the thread will terminate with an InternalError as the mapped buffer
+    // is inaccessible.
+    static void execute(final Callable<?> c) {
+        Runnable r = new Runnable() {
+            public void run() {
+                try {
+                    Object ignore = c.call();
+                } catch (Exception ignore) {
+                }
+            }
+        };
+        Thread t = new Thread(r);
+        t.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
+            public void uncaughtException(Thread t, Throwable e) {
+                e.printStackTrace();
+            }
+        });
+        t.start();
+        try { t.join(); } catch (InterruptedException ignore) { }
+    }
+}