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/System/LoggerFinder/internal/BaseLoggerBridgeTest/CustomSystemClassLoader.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2015, 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.
+ */
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.security.AllPermission;
+import java.security.Permissions;
+import java.security.ProtectionDomain;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * A custom ClassLoader to load the concrete LoggerFinder class
+ * with all permissions.
+ *
+ * @author danielfuchs
+ */
+public class CustomSystemClassLoader extends ClassLoader {
+
+
+    private final ConcurrentHashMap<String, Class<?>> classes = new ConcurrentHashMap<>();
+
+    public CustomSystemClassLoader() {
+        super();
+    }
+    public CustomSystemClassLoader(ClassLoader parent) {
+        super(parent);
+    }
+
+    private Class<?> defineFinderClass(String name)
+        throws ClassNotFoundException {
+        Class<?> finderClass = classes.get(name);
+        if (finderClass != null) return finderClass;
+
+        final Object obj = getClassLoadingLock(name);
+
+        synchronized(obj) {
+            finderClass = classes.get(name);
+            if (finderClass != null) return finderClass;
+
+            URL url = this.getClass().getProtectionDomain().getCodeSource().getLocation();
+            File file = new File(url.getPath(), name+".class");
+            if (file.canRead()) {
+                try {
+                    byte[] b = Files.readAllBytes(file.toPath());
+                    Permissions perms = new Permissions();
+                    perms.add(new AllPermission());
+                    finderClass = defineClass(
+                            name, b, 0, b.length, new ProtectionDomain(
+                            this.getClass().getProtectionDomain().getCodeSource(),
+                            perms));
+                    System.out.println("Loaded " + name);
+                    classes.put(name, finderClass);
+                    return finderClass;
+                } catch (Throwable ex) {
+                    ex.printStackTrace();
+                    throw new ClassNotFoundException(name, ex);
+                }
+            } else {
+                throw new ClassNotFoundException(name,
+                        new IOException(file.toPath() + ": can't read"));
+            }
+        }
+    }
+
+    @Override
+    public synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
+        if (name.equals("BaseLoggerFinder") || name.startsWith("BaseLoggerFinder$")) {
+            Class<?> c = defineFinderClass(name);
+            if (resolve) {
+                resolveClass(c);
+            }
+            return c;
+        }
+        return super.loadClass(name, resolve);
+    }
+
+    @Override
+    protected Class<?> findClass(String name) throws ClassNotFoundException {
+        if (name.equals("BaseLoggerFinder") || name.startsWith("BaseLoggerFinder$")) {
+            return defineFinderClass(name);
+        }
+        return super.findClass(name);
+    }
+
+}