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/lang/RuntimeTests/exec/UnixCommands.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2014, 2020, 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.
+ */
+
+import java.io.File;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Utility class for finding the command on the current system
+ */
+public class UnixCommands {
+
+    public static final boolean isUnix = ! System.getProperty("os.name").startsWith("Windows");
+    public static final boolean isLinux = System.getProperty("os.name").startsWith("Linux");
+
+    private static final String[] paths = {"/bin", "/usr/bin"};
+
+    private static Map<String,String> nameToCommand = new HashMap<>(16);
+
+    /**
+     * Throws Error unless every listed command is available on the system
+     */
+    public static void ensureCommandsAvailable(String... commands) {
+        for (String command : commands) {
+            if (findCommand(command) == null) {
+                throw new Error("Command '" + command + "' not found; bailing out");
+            }
+        }
+    }
+
+    /**
+     * If the path to the command could be found, returns the command with the full path.
+     * Otherwise, returns null.
+     */
+    public static String cat()   { return findCommand("cat"); }
+    public static String sh()    { return findCommand("sh"); }
+    public static String kill()  { return findCommand("kill"); }
+    public static String sleep() { return findCommand("sleep"); }
+    public static String tee()   { return findCommand("tee"); }
+    public static String echo()  { return findCommand("echo"); }
+
+    public static String findCommand(String name) {
+        if (nameToCommand.containsKey(name)) {
+            return nameToCommand.get(name);
+        }
+        String command = findCommand0(name);
+        nameToCommand.put(name, command);
+        return command;
+    }
+
+    private static String findCommand0(String name) {
+        for (String path : paths) {
+            File file = new File(path, name);
+            if (file.canExecute()) {
+                return file.getPath();
+            }
+        }
+        return null;
+    }
+}