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
|
// SPDX-License-Identifier: GPL-2.0
#include <assert.h>
#include <fcntl.h>
#include <inttypes.h>
#include <libgen.h>
#include <limits.h>
#include <linux/coredump.h>
#include <linux/fs.h>
#include <linux/limits.h>
#include <pthread.h>
#include <string.h>
#include <sys/mount.h>
#include <poll.h>
#include <sys/epoll.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include "../kselftest_harness.h"
#include "../filesystems/wrappers.h"
#include "../pidfd/pidfd.h"
#include "coredump_test.h"
#define STACKDUMP_FILE "stack_values"
#define STACKDUMP_SCRIPT "stackdump"
#ifndef PAGE_SIZE
#define PAGE_SIZE 4096
#endif
FIXTURE_SETUP(coredump)
{
FILE *file;
int ret;
self->pid_coredump_server = -ESRCH;
self->fd_tmpfs_detached = -1;
file = fopen("/proc/sys/kernel/core_pattern", "r");
ASSERT_NE(NULL, file);
ret = fread(self->original_core_pattern, 1, sizeof(self->original_core_pattern), file);
ASSERT_TRUE(ret || feof(file));
ASSERT_LT(ret, sizeof(self->original_core_pattern));
self->original_core_pattern[ret] = '\0';
self->fd_tmpfs_detached = create_detached_tmpfs();
ASSERT_GE(self->fd_tmpfs_detached, 0);
ret = fclose(file);
ASSERT_EQ(0, ret);
}
FIXTURE_TEARDOWN(coredump)
{
const char *reason;
FILE *file;
int ret, status;
unlink(STACKDUMP_FILE);
if (self->pid_coredump_server > 0) {
kill(self->pid_coredump_server, SIGTERM);
waitpid(self->pid_coredump_server, &status, 0);
}
unlink("/tmp/coredump.file");
unlink("/tmp/coredump.socket");
file = fopen("/proc/sys/kernel/core_pattern", "w");
if (!file) {
reason = "Unable to open core_pattern";
goto fail;
}
ret = fprintf(file, "%s", self->original_core_pattern);
if (ret < 0) {
reason = "Unable to write to core_pattern";
goto fail;
}
ret = fclose(file);
if (ret) {
reason = "Unable to close core_pattern";
goto fail;
}
if (self->fd_tmpfs_detached >= 0) {
ret = close(self->fd_tmpfs_detached);
if (ret < 0) {
reason = "Unable to close detached tmpfs";
goto fail;
}
self->fd_tmpfs_detached = -1;
}
return;
fail:
/* This should never happen */
fprintf(stderr, "Failed to cleanup stackdump test: %s\n", reason);
}
TEST_F_TIMEOUT(coredump, stackdump, 120)
{
unsigned long long stack;
char *test_dir, *line;
size_t line_length;
char buf[PAGE_SIZE];
int ret, i, status;
FILE *file;
pid_t pid;
/*
* Step 1: Setup core_pattern so that the stackdump script is executed when the child
* process crashes
*/
ret = readlink("/proc/self/exe", buf, sizeof(buf));
ASSERT_NE(-1, ret);
ASSERT_LT(ret, sizeof(buf));
buf[ret] = '\0';
test_dir = dirname(buf);
file = fopen("/proc/sys/kernel/core_pattern", "w");
ASSERT_NE(NULL, file);
ret = fprintf(file, "|%1$s/%2$s %%P %1$s/%3$s", test_dir, STACKDUMP_SCRIPT, STACKDUMP_FILE);
ASSERT_LT(0, ret);
ret = fclose(file);
ASSERT_EQ(0, ret);
/* Step 2: Create a process who spawns some threads then crashes */
pid = fork();
ASSERT_TRUE(pid >= 0);
if (pid == 0)
crashing_child();
/*
* Step 3: Wait for the stackdump script to write the stack pointers to the stackdump file
*/
waitpid(pid, &status, 0);
ASSERT_TRUE(WIFSIGNALED(status));
ASSERT_TRUE(WCOREDUMP(status));
for (i = 0; i < 10; ++i) {
file = fopen(STACKDUMP_FILE, "r");
if (file)
break;
sleep(1);
}
ASSERT_NE(file, NULL);
/* Step 4: Make sure all stack pointer values are non-zero */
line = NULL;
for (i = 0; -1 != getline(&line, &line_length, file); ++i) {
stack = strtoull(line, NULL, 10);
ASSERT_NE(stack, 0);
}
free(line);
ASSERT_EQ(i, 1 + NUM_THREAD_SPAWN);
fclose(file);
}
TEST_HARNESS_MAIN
|
