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
|
/*
* Copyright (c) 2010, 2024, 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
* @key randomness
* @modules java.base/jdk.internal.misc
*
* @summary converted from VM Testbase vm/mlvm/hiddenloader/stress/byteMutation.
* VM Testbase keywords: [feature_mlvm, nonconcurrent]
*
* @library /vmTestbase
* /test/lib
*
* @comment build test class and indify classes
* @build vm.mlvm.hiddenloader.stress.byteMutation.Test
* @run driver vm.mlvm.share.IndifiedClassesBuilder
*
* @run main/othervm vm.mlvm.hiddenloader.stress.byteMutation.Test -stressIterationsFactor 100000
*/
package vm.mlvm.hiddenloader.stress.byteMutation;
import vm.mlvm.hiddenloader.share.HiddenkTestee01;
import vm.mlvm.hiddenloader.share.StressClassLoadingTest;
import vm.mlvm.share.FileUtils;
import vm.share.options.Option;
/**
* The test does the following in a cycle:
*
* <ol>
* <li>Takes bytes from a valid class file
* <li>Sets 1 to 5 bytes in random positions to random values
* <li>Tries to load such class using:
* <ul>
* <li>a custom class loader,
* <li>{@link java.lang.invoke.MethodHandles.Lookup#defineHiddenClass}
* when {@code -hiddenLoad true} option is passed to the test.
* </ul>
* </ol>
*
* <p>In most cases the resulting class file is invalid and rejected by
* the VM verifier. But this test tries to find pathological cases, such
* as infinite loops during verification or VM crashes.
*
*/
public class Test extends StressClassLoadingTest {
private final static Class<?> HOST_CLASS = HiddenkTestee01.class;
private final byte[] testeeBytes;
@Option(name = "mutationCount", default_value = "3",
description = "How many bytes to mutate in a class")
private int mutationCount = 3;
/**
* Constructs the test.
* @throws Exception if there are any errors when
* reading {@link vm.mlvm.hiddenloader.share.HiddenkTestee01} class bytecodes.
*/
public Test() throws Exception {
this.testeeBytes = FileUtils.readClass(HiddenkTestee01.class.getName());
}
/**
* Returns {@link vm.mlvm.hiddenloader.share.HiddenkTestee01} class to the
* parent.
* @return {@link vm.mlvm.hiddenloader.share.HiddenkTestee01} class.
*/
@Override
protected Class<?> getHostClass() {
return HOST_CLASS;
}
/**
* Takes {@link vm.mlvm.hiddenloader.share.HiddenkTestee01} class bytecodes
* and modifies mutationCount bytes setting them to random values.
* @return {@link vm.mlvm.hiddenloader.share.HiddenkTestee01} class bytecodes with modified bytes.
*/
@Override
protected byte[] generateClassBytes() {
// TODO: there is non-zero probability that generated bytecode will be
// valid, so it should be a subject of fuzzing mechanism
byte[] alteredBytes = testeeBytes.clone();
for (int j = 0; j < mutationCount; ++j) {
alteredBytes[getRNG().nextInt(alteredBytes.length)] = (byte) getRNG().nextInt(256);
}
return alteredBytes;
}
/**
* Runs the test.
* @param args Test arguments.
*/
public static void main(String[] args) {
StressClassLoadingTest.launch(args);
}
}
|
