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// Copyright 2021 Code Intelligence GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.code_intelligence.jazzer.replay;
import com.code_intelligence.jazzer.api.FuzzedDataProvider;
import com.code_intelligence.jazzer.runtime.FuzzedDataProviderImpl;
import com.github.fmeum.rules_jni.RulesJni;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Arrays;
public class Replayer {
public static final int STATUS_FINDING = 77;
public static final int STATUS_OTHER_ERROR = 1;
static {
System.setProperty("jazzer.is_replayer", "true");
try {
RulesJni.loadLibrary(
"fuzzed_data_provider_standalone", "/com/code_intelligence/jazzer/driver");
} catch (Throwable t) {
t.printStackTrace();
System.exit(STATUS_OTHER_ERROR);
}
}
public static void main(String[] args) {
if (args.length < 2) {
System.err.println("Usage: <fuzz target class> <input file path> <fuzzerInitialize args>...");
System.exit(STATUS_OTHER_ERROR);
}
ClassLoader.getSystemClassLoader().setDefaultAssertionStatus(true);
Class<?> fuzzTargetClass;
try {
fuzzTargetClass = Class.forName(args[0]);
} catch (ClassNotFoundException e) {
e.printStackTrace();
System.exit(STATUS_OTHER_ERROR);
// Without this return the compiler sees fuzzTargetClass as possibly uninitialized.
return;
}
String inputFilePath = args[1];
byte[] input = loadInput(inputFilePath);
String[] fuzzTargetArgs = Arrays.copyOfRange(args, 2, args.length);
executeFuzzerInitialize(fuzzTargetClass, fuzzTargetArgs);
executeFuzzTarget(fuzzTargetClass, input);
}
private static byte[] loadInput(String inputFilePath) {
try {
return Files.readAllBytes(Paths.get(inputFilePath));
} catch (IOException e) {
e.printStackTrace();
System.exit(STATUS_OTHER_ERROR);
// Without this return the compiler sees loadInput as possibly not returning a value.
return null;
}
}
private static void executeFuzzerInitialize(Class<?> fuzzTarget, String[] args) {
// public static void fuzzerInitialize()
try {
Method fuzzerInitialize = fuzzTarget.getMethod("fuzzerInitialize");
fuzzerInitialize.invoke(null);
return;
} catch (Exception e) {
handleInvokeException(e, fuzzTarget);
}
// public static void fuzzerInitialize(String[] args)
try {
Method fuzzerInitialize = fuzzTarget.getMethod("fuzzerInitialize", String[].class);
fuzzerInitialize.invoke(null, (Object) args);
} catch (Exception e) {
handleInvokeException(e, fuzzTarget);
}
}
public static void executeFuzzTarget(Class<?> fuzzTarget, byte[] input) {
// public static void fuzzerTestOneInput(byte[] input)
try {
Method fuzzerTestOneInput = fuzzTarget.getMethod("fuzzerTestOneInput", byte[].class);
fuzzerTestOneInput.invoke(null, (Object) input);
return;
} catch (Exception e) {
handleInvokeException(e, fuzzTarget);
}
// public static void fuzzerTestOneInput(FuzzedDataProvider data)
try {
Method fuzzerTestOneInput =
fuzzTarget.getMethod("fuzzerTestOneInput", FuzzedDataProvider.class);
try (FuzzedDataProviderImpl fuzzedDataProvider = FuzzedDataProviderImpl.withJavaData(input)) {
fuzzerTestOneInput.invoke(null, fuzzedDataProvider);
}
return;
} catch (Exception e) {
handleInvokeException(e, fuzzTarget);
}
System.err.printf("%s must define exactly one of the following two functions:%n"
+ " public static void fuzzerTestOneInput(byte[] ...)%n"
+ " public static void fuzzerTestOneInput(FuzzedDataProvider ...)%n"
+ "Note: Fuzz targets returning boolean are no longer supported; exceptions should%n"
+ "be thrown instead of returning true.%n",
fuzzTarget.getName());
System.exit(STATUS_OTHER_ERROR);
}
private static void handleInvokeException(Exception e, Class<?> fuzzTarget) {
if (e instanceof NoSuchMethodException)
return;
if (e instanceof InvocationTargetException) {
filterOutOwnStackTraceElements(e.getCause(), fuzzTarget);
e.getCause().printStackTrace();
System.exit(STATUS_FINDING);
} else {
e.printStackTrace();
System.exit(STATUS_OTHER_ERROR);
}
}
private static void filterOutOwnStackTraceElements(Throwable t, Class<?> fuzzTarget) {
if (t.getCause() != null)
filterOutOwnStackTraceElements(t.getCause(), fuzzTarget);
if (t.getStackTrace() == null || t.getStackTrace().length == 0)
return;
StackTraceElement lowestFrame = t.getStackTrace()[t.getStackTrace().length - 1];
if (!lowestFrame.getClassName().equals(Replayer.class.getName())
|| !lowestFrame.getMethodName().equals("main"))
return;
for (int i = t.getStackTrace().length - 1; i >= 0; i--) {
StackTraceElement frame = t.getStackTrace()[i];
if (frame.getClassName().equals(fuzzTarget.getName())
&& frame.getMethodName().equals("fuzzerTestOneInput")) {
t.setStackTrace(Arrays.copyOfRange(t.getStackTrace(), 0, i + 1));
break;
}
}
}
}
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