| /* |
| * Copyright (c) 2010, 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 |
| * @modules java.base/jdk.internal.misc |
| * |
| * @summary converted from VM Testbase vm/mlvm/anonloader/stress/byteMutation. |
| * VM Testbase keywords: [feature_mlvm, nonconcurrent] |
| * |
| * @library /vmTestbase |
| * /test/lib |
| * @run driver jdk.test.lib.FileInstaller . . |
| * |
| * @comment build test class and indify classes |
| * @build vm.mlvm.anonloader.stress.byteMutation.Test |
| * @run driver vm.mlvm.share.IndifiedClassesBuilder |
| * |
| * @run main/othervm vm.mlvm.anonloader.stress.byteMutation.Test -stressIterationsFactor 100000 |
| */ |
| |
| package vm.mlvm.anonloader.stress.byteMutation; |
| |
| import vm.mlvm.anonloader.share.AnonkTestee01; |
| import vm.mlvm.anonloader.share.StressClassLoadingTest; |
| import vm.share.FileUtils; |
| import vm.share.options.Option; |
| |
| /** |
| * The test does the following in a cycle: |
| * |
| * <ol> |
| * <li>Takes bytes from a valid class file |
| * <li>Sets 1 to 5 bytes in random positions to random values |
| * <li>Tries to load such class using: |
| * <ul> |
| * <li>a custom class loader, |
| * <li>{@link sun.misc.Unsafe#defineAnonymousClass} |
| * when {@code -unsafeLoad true} option is passed to the test. |
| * </ul> |
| * </ol> |
| * |
| * <p>In most cases the resulting class file is invalid and rejected by |
| * the VM verifier. But this test tries to find pathological cases, such |
| * as infinite loops during verification or VM crashes. |
| * |
| * <p>NB: There is a tool to load invalid classes saved by this test. |
| * Please see tool documentation at {@link vm.mlvm.tools.LoadClass} |
| * |
| */ |
| public class Test extends StressClassLoadingTest { |
| private final static Class<?> HOST_CLASS = AnonkTestee01.class; |
| private final byte[] testeeBytes; |
| @Option(name = "mutationCount", default_value = "3", |
| description = "How many bytes to mutate in a class") |
| private int mutationCount = 3; |
| |
| /** |
| * Constructs the test. |
| * @throws Exception if there are any errors when |
| * reading {@link vm.mlvm.anonloader.share.AnonkTestee01} class bytecodes. |
| */ |
| public Test() throws Exception { |
| this.testeeBytes = FileUtils.readClass(AnonkTestee01.class.getName()); |
| } |
| |
| /** |
| * Returns {@link vm.mlvm.anonloader.share.AnonkTestee01} class to the |
| * parent. |
| * @return {@link vm.mlvm.anonloader.share.AnonkTestee01} class. |
| */ |
| @Override |
| protected Class<?> getHostClass() { |
| return HOST_CLASS; |
| } |
| |
| /** |
| * Takes {@link vm.mlvm.anonloader.share.AnonkTestee01} class bytecodes |
| * and modifies mutationCount bytes setting them to random values. |
| * @return {@link vm.mlvm.anonloader.share.AnonkTestee01} class bytecodes with modified bytes. |
| */ |
| @Override |
| protected byte[] generateClassBytes() { |
| // TODO: there is non-zero probability that generated bytecode will be |
| // valid, so it should be a subject of fuzzing mechanism |
| byte[] alteredBytes = testeeBytes.clone(); |
| for (int j = 0; j < mutationCount; ++j) { |
| alteredBytes[getRNG().nextInt(alteredBytes.length)] = (byte) getRNG().nextInt(256); |
| } |
| return alteredBytes; |
| } |
| |
| /** |
| * Runs the test. |
| * @param args Test arguments. |
| */ |
| public static void main(String[] args) { |
| StressClassLoadingTest.launch(args); |
| } |
| } |