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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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24
25 /**
26 * @test
27 * @bug 6626217
28 * @summary Loader-constraint table allows arrays instead of only the base-classes
29 * @library /test/lib
30 * @compile bug_21227.java from_loader2.java
31 * @run driver ClassFileInstaller from_loader2
32 * @compile impl2/many_loader.java
33 * @run driver ClassFileInstaller many_loader
34 * @compile many_loader.java
35 * @run main/othervm -Xverify -Xint bug_21227
36 */
37
38 import java.lang.reflect.*;
39 import java.security.*;
40
41 abstract public class bug_21227 {
42
43 // Jam anything you want in here, it will be cast to a You_Have_Been_P0wned.
44 public static Object _p0wnee;
45
46 public static void main(String argv[]) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
47 try {
48 System.out.println("Warmup");
49
50 // Make a Class 'many_loader' under the default loader.
51 bug_21227 bug = new many_loader();
52
53 // Some classes under a new Loader, LOADER2, including another version of 'many_loader'.
54 ClassLoader LOADER2 = new Loader2();
55 Class clazz2 = LOADER2.loadClass("from_loader2");
56 IFace iface = (IFace)clazz2.newInstance();
57
58 // Set the victim, a String of length 6.
59 String s = "victim";
60 _p0wnee = s;
61
62 // Go cast '_p0wnee' to type You_Have_Been_P0wned.
63 many_loader[] x2 = bug.make(iface);
64
65 many_loader b = x2[0];
66
67 // Make it clear that the runtime type many_loader (what we get from the
68 // array X2) varies from the static type of many_loader.
69 Class cl1 = b.getClass();
70 ClassLoader ld1 = cl1.getClassLoader();
71 Class cl2 = many_loader.class;
72 ClassLoader ld2 = cl2.getClassLoader();
73 System.out.println("bug.make() "+ld1+":"+cl1);
74 System.out.println("many_loader "+ld2+":"+cl2);
75
76 // Read the victims guts out.
77 You_Have_Been_P0wned q = b._p0wnee;
78 System.out.println("q._a = 0x"+Integer.toHexString(q._a));
79 System.out.println("q._b = 0x"+Integer.toHexString(q._b));
80 System.out.println("q._c = 0x"+Integer.toHexString(q._c));
81 System.out.println("q._d = 0x"+Integer.toHexString(q._d));
82
83 System.out.println("I will now crash the VM:");
84 // On 32-bit HotSpot Java6 this sets the victim String length shorter, then crashes the VM.
85 //q._c = 3;
86 q._a = -1;
87
88 System.out.println(s);
89 throw new RuntimeException("Expected LinkageError was not thrown.");
90 } catch (LinkageError e) {
91 String errorMsg = e.getMessage();
92 if (!errorMsg.contains("")) {
93 throw new RuntimeException("Error message of LinkageError does not contain \"loader constraint\":" +
94 errorMsg);
95 }
96 System.out.println("Passed with message: " + errorMsg);
97 }
98 }
99
100 // I need to compile (hence call in a loop) a function which returns a value
101 // loaded from classloader other than the system one. The point of this
102 // call is to give me an abstract 'hook' into a function loaded with a
103 // foreign loader.
104 public abstract many_loader[] make(IFace iface); // abstract factory
105 }
106