1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 8058575 27 * @summary Test that bad host classes cause exceptions to get thrown. 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.base/jdk.internal.org.objectweb.asm 31 * @run main TestBadHostClass 32 */ 33 34 35 import java.lang.*; 36 import java.lang.reflect.Field; 37 import jdk.internal.misc.Unsafe; 38 import jdk.test.lib.unsafe.UnsafeHelper; 39 import jdk.internal.org.objectweb.asm.ClassWriter; 40 import static jdk.internal.org.objectweb.asm.Opcodes.*; 41 42 // Test that bad host classes cause exceptions. 43 public class TestBadHostClass { 44 45 private static final Unsafe unsafe = Unsafe.getUnsafe(); 46 47 private static String packageName(Class<?> c) { 48 if (c.isArray()) { 49 return packageName(c.getComponentType()); 50 } else { 51 String name = c.getName(); 52 int dot = name.lastIndexOf('.'); 53 if (dot == -1) return ""; 54 return name.substring(0, dot); 55 } 56 } 57 58 private static int constantPoolSize(byte[] classFile) { 59 return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF); 60 } 61 62 static public void badHostClass(Class<?> hostClass) { 63 // choose a class name in the same package as the host class 64 String className; 65 if (hostClass != null) { 66 String prefix = packageName(hostClass); 67 if (prefix.length() > 0) 68 prefix = prefix.replace('.', '/') + "/"; 69 className = prefix + "Anon"; 70 } else { 71 className = "Anon"; 72 } 73 74 // create the class 75 String superName = "java/lang/Object"; 76 ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS 77 + ClassWriter.COMPUTE_FRAMES); 78 cw.visit(V1_8, ACC_PUBLIC + ACC_FINAL + ACC_SUPER, 79 className, null, superName, null); 80 byte[] classBytes = cw.toByteArray(); 81 int cpPoolSize = constantPoolSize(classBytes); 82 Class<?> anonClass 83 = unsafe.defineAnonymousClass(hostClass, classBytes, new Object[cpPoolSize]); 84 } 85 86 public static void main(String args[]) throws Exception { 87 // host class is an array of java.lang.Objects. 88 try { 89 badHostClass(Object[].class); 90 } catch (IllegalArgumentException ex) { 91 } 92 93 // host class is an array of objects of this class. 94 try { 95 badHostClass(TestBadHostClass[].class); 96 } catch (IllegalArgumentException ex) { 97 } 98 99 // host class is null. 100 try { 101 badHostClass(null); 102 } catch (NullPointerException ex) { 103 } 104 105 // host class is a primitive array class. 106 try { 107 badHostClass(int[].class); 108 } catch (IllegalArgumentException ex) { 109 } 110 } 111 }