1 // Copyright 2022 Code Intelligence GmbH 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package com.example; 16 17 import com.code_intelligence.jazzer.api.FuzzerSecurityIssueLow; 18 import com.code_intelligence.jazzer.api.HookType; 19 import com.code_intelligence.jazzer.api.MethodHook; 20 import java.lang.invoke.MethodHandle; 21 import java.lang.reflect.Field; 22 import java.util.regex.Pattern; 23 24 public class HookDependenciesFuzzerHooks { 25 private static final Field PATTERN_ROOT; 26 27 static { 28 Field root; 29 try { 30 root = Pattern.class.getDeclaredField("root"); 31 } catch (NoSuchFieldException e) { 32 root = null; 33 } 34 PATTERN_ROOT = root; 35 } 36 37 @MethodHook(type = HookType.AFTER, targetClassName = "java.util.regex.Matcher", 38 targetMethod = "matches", targetMethodDescriptor = "()Z", 39 additionalClassesToHook = {"java.util.regex.Pattern"}) 40 public static void matcherMatchesHook(MethodHandle method, Object alwaysNull, Object[] alwaysEmpty, int hookId, Boolean returnValue)41 matcherMatchesHook(MethodHandle method, Object alwaysNull, Object[] alwaysEmpty, int hookId, 42 Boolean returnValue) { 43 if (PATTERN_ROOT != null) { 44 throw new FuzzerSecurityIssueLow("Hook applied even though it depends on the class to hook"); 45 } 46 } 47 } 48