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
218
219
220
221
222
223
224
225
|
/* Test program for POSIX shm_* functions.
Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/wait.h>
/* We want to see output immediately. */
#define STDOUT_UNBUFFERED
static char shm_test_name[sizeof "/glibc-shm-test-" + sizeof (pid_t) * 3];
static char shm_escape_name[sizeof "/../escaped-" + sizeof (pid_t) * 3];
static void
init_shm_test_names (void)
{
snprintf (shm_test_name, sizeof (shm_test_name), "/glibc-shm-test-%u",
getpid ());
snprintf (shm_escape_name, sizeof (shm_escape_name), "/../escaped-%u",
getpid ());
}
static void
worker (int write_now)
{
struct timespec ts;
struct stat64 st;
int i;
int fd = shm_open (shm_test_name, O_RDWR, 0600);
if (fd == -1)
error (EXIT_FAILURE, 0, "failed to open shared memory object: shm_open");
char *mem;
if (fd == -1)
exit (fd);
if (fstat64 (fd, &st) == -1)
error (EXIT_FAILURE, 0, "stat failed");
if (st.st_size != 4000)
error (EXIT_FAILURE, 0, "size incorrect");
mem = mmap (NULL, 4000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mem == MAP_FAILED)
error (EXIT_FAILURE, 0, "mmap failed");
ts.tv_sec = 0;
ts.tv_nsec = 500000000;
if (write_now)
for (i = 0; i <= 4; ++i)
mem[i] = i;
else
/* Wait until the first bytes of the memory region are 0, 1, 2, 3, 4. */
while (1)
{
for (i = 0; i <= 4; ++i)
if (mem[i] != i)
break;
if (i > 4)
/* OK, that's done. */
break;
nanosleep (&ts, NULL);
}
if (!write_now)
for (i = 0; i <= 4; ++i)
mem[i] = 4 + i;
else
/* Wait until the first bytes of the memory region are 4, 5, 6, 7, 8. */
while (1)
{
for (i = 0; i <= 4; ++i)
if (mem[i] != 4 + i)
break;
if (i > 4)
/* OK, that's done. */
break;
nanosleep (&ts, NULL);
}
if (munmap (mem, 4000) == -1)
error (EXIT_FAILURE, errno, "munmap");
close (fd);
exit (0);
}
static int
do_test (void)
{
int fd;
pid_t pid1;
pid_t pid2;
int status1;
int status2;
struct stat64 st;
init_shm_test_names ();
fd = shm_open (shm_escape_name, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
if (fd != -1)
{
perror ("read file outside of SHMDIR directory");
return 1;
}
/* Create the shared memory object. */
fd = shm_open (shm_test_name, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
if (fd == -1)
{
/* If shm_open is unimplemented we skip the test. */
if (errno == ENOSYS)
{
perror ("shm_open unimplemented. Test skipped.");
return 0;
}
else
error (EXIT_FAILURE, 0, "failed to create shared memory object: shm_open");
}
/* Size the object. We make it 4000 bytes long. */
if (ftruncate (fd, 4000) == -1)
{
/* This failed. Must be a bug in the implementation of the
shared memory itself. */
perror ("failed to size of shared memory object: ftruncate");
close (fd);
shm_unlink (shm_test_name);
return 0;
}
if (fstat64 (fd, &st) == -1)
{
shm_unlink (shm_test_name);
error (EXIT_FAILURE, 0, "initial stat failed");
}
if (st.st_size != 4000)
{
shm_unlink (shm_test_name);
error (EXIT_FAILURE, 0, "initial size not correct");
}
/* Spawn to processes which will do the work. */
pid1 = fork ();
if (pid1 == 0)
worker (0);
else if (pid1 == -1)
{
/* Couldn't create a second process. */
perror ("fork");
close (fd);
shm_unlink (shm_test_name);
return 0;
}
pid2 = fork ();
if (pid2 == 0)
worker (1);
else if (pid2 == -1)
{
/* Couldn't create a second process. */
int ignore;
perror ("fork");
kill (pid1, SIGTERM);
waitpid (pid1, &ignore, 0);
close (fd);
shm_unlink (shm_test_name);
return 0;
}
/* Wait until the two processes are finished. */
waitpid (pid1, &status1, 0);
waitpid (pid2, &status2, 0);
/* Now we can unlink the shared object. */
shm_unlink (shm_test_name);
return (!WIFEXITED (status1) || WEXITSTATUS (status1) != 0
|| !WIFEXITED (status2) || WEXITSTATUS (status2) != 0);
}
static void
cleanup_handler (void)
{
shm_unlink (shm_test_name);
}
#define CLEANUP_HANDLER cleanup_handler
#include <support/test-driver.c>
|
