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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/*
* Copyright (C) 2013 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <sys/types.h>
#include <signal.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <unistd.h>
#include <inttypes.h>
#include <backtrace/backtrace.h>
#define FINISH(pid) dump_frames(&backtrace); if (pid < 0) exit(1); else return false;
// Prototypes for functions in the test library.
int test_level_one(int, int, int, int, bool (*)(pid_t));
int test_recursive_call(int, bool (*)(pid_t));
void dump_frames(const backtrace_t* backtrace) {
for (size_t i = 0; i < backtrace->num_frames; i++) {
printf("%zu ", i);
if (backtrace->frames[i].map_name) {
printf("%s", backtrace->frames[i].map_name);
} else {
printf("<unknown>");
}
if (backtrace->frames[i].proc_name) {
printf(" %s", backtrace->frames[i].proc_name);
if (backtrace->frames[i].proc_offset) {
printf("+%" PRIuPTR, backtrace->frames[i].proc_offset);
}
}
printf("\n");
}
}
bool check_frame(const backtrace_t* backtrace, size_t frame_num,
const char* expected_name) {
if (backtrace->frames[frame_num].proc_name == NULL) {
printf(" Frame %zu function name expected %s, real value is NULL.\n",
frame_num, expected_name);
return false;
}
if (strcmp(backtrace->frames[frame_num].proc_name, expected_name) != 0) {
printf(" Frame %zu function name expected %s, real value is %s.\n",
frame_num, expected_name, backtrace->frames[frame_num].proc_name);
return false;
}
return true;
}
bool verify_level_backtrace(pid_t pid) {
const char* test_type;
if (pid < 0) {
test_type = "current";
} else {
test_type = "running";
}
backtrace_t backtrace;
if (!backtrace_get_data(&backtrace, pid)) {
printf(" backtrace_get_data failed on %s process.\n", test_type);
FINISH(pid);
}
if (backtrace.num_frames == 0) {
printf(" backtrace_get_data returned no frames for %s process.\n",
test_type);
FINISH(pid);
}
// Look through the frames starting at the highest to find the
// frame we want.
size_t frame_num = 0;
for (size_t i = backtrace.num_frames-1; i > 2; i--) {
if (backtrace.frames[i].proc_name != NULL &&
strcmp(backtrace.frames[i].proc_name, "test_level_one") == 0) {
frame_num = i;
break;
}
}
if (!frame_num) {
printf(" backtrace_get_data did not include the test_level_one frame.\n");
FINISH(pid);
}
if (!check_frame(&backtrace, frame_num, "test_level_one")) {
FINISH(pid);
}
if (!check_frame(&backtrace, frame_num-1, "test_level_two")) {
FINISH(pid);
}
if (!check_frame(&backtrace, frame_num-2, "test_level_three")) {
FINISH(pid);
}
if (!check_frame(&backtrace, frame_num-3, "test_level_four")) {
FINISH(pid);
}
backtrace_free_data(&backtrace);
return true;
}
bool verify_max_backtrace(pid_t pid) {
const char* test_type;
if (pid < 0) {
test_type = "current";
} else {
test_type = "running";
}
backtrace_t backtrace;
if (!backtrace_get_data(&backtrace, pid)) {
printf(" backtrace_get_data failed on %s process.\n", test_type);
FINISH(pid);
}
if (backtrace.num_frames != MAX_BACKTRACE_FRAMES) {
printf(" backtrace_get_data %s process max frame check failed:\n",
test_type);
printf(" Expected num frames to be %zu, found %zu\n",
MAX_BACKTRACE_FRAMES, backtrace.num_frames);
FINISH(pid);
}
backtrace_free_data(&backtrace);
return true;
}
void verify_proc_test(pid_t pid, bool (*verify_func)(pid_t)) {
printf(" Waiting 5 seconds for process to get to infinite loop.\n");
sleep(5);
if (ptrace(PTRACE_ATTACH, pid, 0, 0) < 0) {
printf("Failed to attach to pid %d\n", pid);
kill(pid, SIGKILL);
exit(1);
}
bool pass = verify_func(pid);
if (ptrace(PTRACE_DETACH, pid, 0, 0) != 0) {
printf("Failed to detach from pid %d\n", pid);
kill(pid, SIGKILL);
exit(1);
}
kill(pid, SIGKILL);
int status;
if (waitpid(pid, &status, 0) != pid) {
printf("Forked process did not terminate properly.\n");
exit(1);
}
if (!pass) {
exit(1);
}
}
int main() {
printf("Running level test on current process...\n");
int value = test_level_one(1, 2, 3, 4, verify_level_backtrace);
if (value == 0) {
printf("This should never happen.\n");
exit(1);
}
printf(" Passed.\n");
printf("Running max level test on current process...\n");
value = test_recursive_call(MAX_BACKTRACE_FRAMES+10, verify_max_backtrace);
if (value == 0) {
printf("This should never happen.\n");
exit(1);
}
printf(" Passed.\n");
printf("Running level test on process...\n");
pid_t pid;
if ((pid = fork()) == 0) {
value = test_level_one(1, 2, 3, 4, NULL);
if (value == 0) {
printf("This should never happen.\n");
}
exit(1);
}
verify_proc_test(pid, verify_level_backtrace);
printf(" Passed.\n");
printf("Running max frame test on process...\n");
if ((pid = fork()) == 0) {
value = test_recursive_call(MAX_BACKTRACE_FRAMES+10, NULL);
if (value == 0) {
printf("This should never happen.\n");
}
exit(1);
}
verify_proc_test(pid, verify_max_backtrace);
printf(" Passed.\n");
printf("All tests passed.\n");
return 0;
}
|
