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/net/Socket/ReadAfterReset.java

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+/*
+ * Copyright (c) 2018, 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
+ * @requires (os.family == "linux" | os.family == "mac")
+ * @bug 8203937
+ * @summary Test reading bytes from a socket after the connection has been
+ *          reset by the peer
+ */
+
+import java.io.IOException;
+import java.io.PrintStream;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * This test exercises platform specific and unspecified behavior. It exists
+ * only to ensure that the behavior doesn't change between JDK releases.
+ */
+
+public class ReadAfterReset {
+    private static final PrintStream out = System.out;
+
+    // number of bytes to write before the connection reset
+    private static final int NUM_BYTES_TO_WRITE = 1000;
+
+    public static void main(String[] args) throws IOException {
+        try (ServerSocket ss = new ServerSocket()) {
+            ss.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
+
+            /**
+             * Connect to the server which will write some bytes and reset the
+             * connection. The client then attempts to read the bytes sent by
+             * the server before it closed the connection.
+             */
+            out.println("Test connection ...");
+            try (Socket s = new Socket()) {
+                s.connect(ss.getLocalSocketAddress());
+                int nwrote = acceptAndResetConnection(ss);
+                int nread = readUntilIOException(s);
+                if (nread != nwrote) {
+                    throw new RuntimeException("Client read " + nread + ", expected " + nwrote);
+                }
+            }
+
+            /**
+             * Connect to the server which will write some bytes and reset the
+             * connection. The client then writes to its end of the connection,
+             * failing as the connection is reset. It then attempts to read the
+             * bytes sent by the server before it closed the connection.
+             */
+            out.println();
+            out.println("Test connection ...");
+            try (Socket s = new Socket()) {
+                s.connect(ss.getLocalSocketAddress());
+                int nwrote = acceptAndResetConnection(ss);
+                writeUntilIOException(s);
+                int nread = readUntilIOException(s);
+                if (nread != nwrote) {
+                    throw new RuntimeException("Client read " + nread + ", expected " + nwrote);
+                }
+            }
+        }
+    }
+
+    /**
+     * Accept a connection, write bytes, and then reset the connection
+     */
+    static int acceptAndResetConnection(ServerSocket ss) throws IOException {
+        int count = NUM_BYTES_TO_WRITE;
+        try (Socket peer = ss.accept()) {
+            peer.getOutputStream().write(new byte[count]);
+            peer.setSoLinger(true, 0);
+            out.format("Server wrote %d bytes and reset connection%n", count);
+        }
+        return count;
+    }
+
+    /**
+     * Write bytes to a socket until I/O exception is thrown
+     */
+    static void writeUntilIOException(Socket s) {
+        try {
+            byte[] bytes = new byte[100];
+            while (true) {
+                s.getOutputStream().write(bytes);
+                out.format("Client wrote %d bytes%n", bytes.length);
+            }
+        } catch (IOException ioe) {
+            out.format("Client write failed: %s (expected)%n", ioe);
+        }
+    }
+
+    /**
+     * Read bytes from a socket until I/O exception is thrown.
+     *
+     * @return the number of bytes read before the I/O exception was thrown
+     */
+    static int readUntilIOException(Socket s) {
+        int nread = 0;
+        try {
+            byte[] bytes = new byte[100];
+            while (true) {
+                int n = s.getInputStream().read(bytes);
+                if (n < 0) {
+                    out.println("Client read EOF");
+                    break;
+                } else {
+                    out.format("Client read %s bytes%n", n);
+                    nread += n;
+                }
+            }
+        } catch (IOException ioe) {
+            out.format("Client read failed: %s (expected)%n", ioe);
+        }
+        return nread;
+    }
+}