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/io/InputStreamReader/GrowAfterEOF.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 1998, 2010, 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 4101707
+   @summary Test if fill() will behave correctly at EOF to
+            allow file to grow.
+*/
+
+import java.io.*;
+
+public class GrowAfterEOF {
+    public static void main(String[] args) throws Exception {
+        File input = new File(".", "TestEOFInput.txt");
+        RandomAccessFile rf = new RandomAccessFile(input, "rw");
+        try {
+            BufferedReader r = new BufferedReader
+                (new InputStreamReader(new FileInputStream(input)));
+            try {
+                // write something
+                rf.writeBytes("a line");
+
+                // read till the end of file
+                while (r.readLine() != null);
+
+                // append to the end of the file
+                rf.seek(rf.length());
+                rf.writeBytes("new line");
+
+                // now try to read again
+                boolean readMore = false;
+                while (r.readLine() != null) {
+                    readMore = true;
+                }
+                if (!readMore) {
+                    input.delete();
+                    throw new Exception("Failed test: unable to read!");
+                } else {
+                    input.delete();
+                }
+            } finally {
+                r.close();
+            }
+        } finally {
+            rf.close();
+        }
+    }
+}