1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test DefineAnon
* @bug 8058575
* @library /testlibrary
* @modules java.base/jdk.internal.org.objectweb.asm
* java.management
* @compile -XDignore.symbol.file=true DefineAnon.java
* @run main/othervm p1.DefineAnon
*/
package p1;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import jdk.internal.org.objectweb.asm.Opcodes;
import sun.misc.Unsafe;
class T {
static protected void test0() { System.out.println("test0 (public)"); }
static protected void test1() { System.out.println("test1 (protected)"); }
static /*package-private*/ void test2() { System.out.println("test2 (package)"); }
static private void test3() { System.out.println("test3 (private)"); }
}
public class DefineAnon {
private static Unsafe getUnsafe() {
try {
java.lang.reflect.Field singleoneInstanceField = Unsafe.class.getDeclaredField("theUnsafe");
singleoneInstanceField.setAccessible(true);
return (Unsafe) singleoneInstanceField.get(null);
} catch (Throwable ex) {
throw new RuntimeException("Was unable to get Unsafe instance.");
}
}
static Unsafe UNSAFE = DefineAnon.getUnsafe();
static Class<?> getAnonClass(Class<?> hostClass, final String className) {
final String superName = "java/lang/Object";
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, className, null, superName, null);
MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, "test", "()V", null, null);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test0", "()V", false);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test1", "()V", false);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test2", "()V", false);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test3", "()V", false);
mv.visitInsn(Opcodes.RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
final byte[] classBytes = cw.toByteArray();
Class<?> invokerClass = UNSAFE.defineAnonymousClass(hostClass, classBytes, new Object[0]);
UNSAFE.ensureClassInitialized(invokerClass);
return invokerClass;
}
public static void main(String[] args) throws Throwable {
Throwable fail = null;
// Anonymous class has the privileges of its host class, so test[0123] should all work.
System.out.println("Injecting from the same package (p1):");
Class<?> p1cls = getAnonClass(T.class, "p1/AnonClass");
try {
p1cls.getMethod("test").invoke(null);
} catch (Throwable ex) {
ex.printStackTrace();
fail = ex; // throw this to make test fail, since subtest failed
}
// Anonymous class has different package name from host class. Should throw
// IllegalArgumentException.
System.out.println("Injecting from the wrong package (p2):");
try {
Class<?> p2cls = getAnonClass(DefineAnon.class, "p2/AnonClass");
p2cls.getMethod("test").invoke(null);
System.out.println("Failed, did not get expected IllegalArgumentException");
} catch (java.lang.IllegalArgumentException e) {
if (e.getMessage().contains("Host class p1/DefineAnon and anonymous class p2/AnonClass")) {
System.out.println("Got expected IllegalArgumentException: " + e.getMessage());
} else {
throw new RuntimeException("Unexpected message: " + e.getMessage());
}
} catch (Throwable ex) {
ex.printStackTrace();
fail = ex; // throw this to make test fail, since subtest failed
}
// Inject a class in the unnamed package into p1.T. It should be able
// to access all methods in p1.T.
System.out.println("Injecting unnamed package into correct host class:");
try {
Class<?> p3cls = getAnonClass(T.class, "AnonClass");
p3cls.getMethod("test").invoke(null);
} catch (Throwable ex) {
ex.printStackTrace();
fail = ex; // throw this to make test fail, since subtest failed
}
// Try using an array class as the host class. This should throw IllegalArgumentException.
try {
Class<?> p3cls = getAnonClass(String[].class, "AnonClass");
throw new RuntimeException("Expected IllegalArgumentException not thrown");
} catch (IllegalArgumentException ex) {
}
if (fail != null) throw fail; // make test fail, since subtest failed
}
}
|
