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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class Main {
static class ArrayMemEater {
static boolean sawOome;
static void blowup(char[][] holder) {
try {
for (int i = 0; i < holder.length; ++i) {
holder[i] = new char[1024 * 1024];
}
} catch (OutOfMemoryError oome) {
ArrayMemEater.sawOome = true;
}
}
}
static class InstanceMemEater {
static boolean sawOome;
static InstanceMemEater hook;
InstanceMemEater next;
double d1, d2, d3, d4, d5, d6, d7, d8; // Bloat this object so we fill the heap faster.
static InstanceMemEater allocate() {
try {
return new InstanceMemEater();
} catch (OutOfMemoryError e) {
InstanceMemEater.sawOome = true;
return null;
}
}
static void confuseCompilerOptimization(InstanceMemEater instance) {
hook = instance;
}
}
private static int exhaustJavaHeap(Object[] data, int index, int size) {
Runtime.getRuntime().gc();
while (index != data.length && size != 0) {
try {
data[index] = new byte[size];
++index;
} catch (OutOfMemoryError oome) {
size /= 2;
}
}
return index;
}
public static Object eatAllMemory() {
Object[] result = null;
int size = 1000000;
// Make sure that there is no reclaimable memory in the heap. Otherwise we may throw
// OOME to prevent GC thrashing, even if later allocations may succeed.
Runtime.getRuntime().gc();
System.runFinalization();
// NOTE: There is a GC invocation in exhaustJavaHeap. So we don't need one here.
while (result == null && size != 0) {
try {
result = new Object[size];
} catch (OutOfMemoryError oome) {
size /= 2;
}
}
if (result != null) {
int index = 0;
// Repeat to ensure there is no space left on the heap.
index = exhaustJavaHeap(result, index, size);
index = exhaustJavaHeap(result, index, /*size*/ 4);
index = exhaustJavaHeap(result, index, /*size*/ 4);
}
return result;
}
static boolean triggerArrayOOM() {
ArrayMemEater.blowup(new char[128 * 1024][]);
return ArrayMemEater.sawOome;
}
static boolean triggerInstanceOOM() {
InstanceMemEater memEater = InstanceMemEater.allocate();
InstanceMemEater lastMemEater = memEater;
do {
lastMemEater.next = InstanceMemEater.allocate();
lastMemEater = lastMemEater.next;
} while (lastMemEater != null);
memEater.confuseCompilerOptimization(memEater);
InstanceMemEater.hook = null;
return InstanceMemEater.sawOome;
}
public static void main(String[] args) {
if (triggerReflectionOOM()) {
System.out.println("Test reflection correctly threw");
}
if (triggerReflectionOOM2()) {
System.out.println("Test reflection2 correctly threw");
}
if (triggerArrayOOM()) {
System.out.println("NEW_ARRAY correctly threw OOME");
}
if (triggerInstanceOOM()) {
System.out.println("NEW_INSTANCE correctly threw OOME");
}
}
static Object[] holder;
public static void blowup() throws Exception {
int size = 2 * 1024 * 1024;
for (int i = 0; i < holder.length; ) {
try {
holder[i] = new char[size];
i++;
} catch (OutOfMemoryError oome) {
size = size / 16;
if (size == 0) {
break;
}
}
}
holder[0] = new char[100000];
}
static boolean triggerReflectionOOM() {
try {
Class<?> c = Main.class;
Method m = c.getMethod("blowup");
holder = new Object[1000000];
m.invoke(null);
holder = null;
System.out.println("Didn't throw from blowup");
} catch (OutOfMemoryError e) {
holder = null;
} catch (InvocationTargetException e) {
holder = null;
if (!(e.getCause() instanceof OutOfMemoryError)) {
System.out.println("InvocationTargetException cause not OOME " + e.getCause());
return false;
}
} catch (Exception e) {
holder = null;
System.out.println("Unexpected exception " + e);
return false;
}
return true;
}
static boolean triggerReflectionOOM2() {
Object memory = eatAllMemory();
boolean result = false;
try {
Main.class.getDeclaredMethods();
} catch (OutOfMemoryError e) {
result = true;
}
if (!result) {
boolean memoryWasAllocated = (memory != null);
memory = null;
System.out.println("memoryWasAllocated = " + memoryWasAllocated);
}
return result;
}
}
|
