blob: fcc759f0f8fd617a972a646ca175894c964a08b2 [file] [log] [blame]
/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.
*/
import java.lang.reflect.*;
public class Main {
public static final String TEST_NAME = "998-redefine-use-after-free";
public static final int REPS = 1000;
public static final int STEP = 100;
public static void main(String[] args) throws Exception {
for (int i = 0; i < REPS; i += STEP) {
runSeveralTimes(STEP);
}
}
public static ClassLoader getClassLoaderFor(String location) throws Exception {
try {
Class<?> class_loader_class = Class.forName("dalvik.system.PathClassLoader");
Constructor<?> ctor =
class_loader_class.getConstructor(String.class, ClassLoader.class);
return (ClassLoader) ctor.newInstance(
location + "/" + TEST_NAME + "-ex.jar", Main.class.getClassLoader());
} catch (ClassNotFoundException e) {
// Running on RI. Use URLClassLoader.
return new java.net.URLClassLoader(
new java.net.URL[] { new java.net.URL("file://" + location + "/classes-ex/") });
}
}
// Run the redefinition several times on a single class-loader to try to trigger the
// Use-after-free bug b/62237378
public static void runSeveralTimes(int times) throws Exception {
ClassLoader c = getClassLoaderFor(System.getenv("DEX_LOCATION"));
Class<?> klass = (Class<?>) c.loadClass("DexCacheSmash");
Method m = klass.getDeclaredMethod("run");
for (int i = 0; i < times; i++) {
m.invoke(null);
}
}
}