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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
// SPDX-License-Identifier: GPL-2.0
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <linux/msg.h>
#include <fcntl.h>
#include "../kselftest.h"
#define MAX_MSG_SIZE 32
struct msg1 {
int msize;
long mtype;
char mtext[MAX_MSG_SIZE];
};
#define TEST_STRING "Test sysv5 msg"
#define MSG_TYPE 1
#define ANOTHER_TEST_STRING "Yet another test sysv5 msg"
#define ANOTHER_MSG_TYPE 26538
struct msgque_data {
key_t key;
int msq_id;
int qbytes;
int qnum;
int mode;
struct msg1 *messages;
};
int restore_queue(struct msgque_data *msgque)
{
int fd, ret, id, i;
char buf[32];
fd = open("/proc/sys/kernel/msg_next_id", O_WRONLY);
if (fd == -1) {
printf("Failed to open /proc/sys/kernel/msg_next_id\n");
return -errno;
}
sprintf(buf, "%d", msgque->msq_id);
ret = write(fd, buf, strlen(buf));
if (ret != strlen(buf)) {
printf("Failed to write to /proc/sys/kernel/msg_next_id\n");
return -errno;
}
id = msgget(msgque->key, msgque->mode | IPC_CREAT | IPC_EXCL);
if (id == -1) {
printf("Failed to create queue\n");
return -errno;
}
if (id != msgque->msq_id) {
printf("Restored queue has wrong id (%d instead of %d)\n",
id, msgque->msq_id);
ret = -EFAULT;
goto destroy;
}
for (i = 0; i < msgque->qnum; i++) {
if (msgsnd(msgque->msq_id, &msgque->messages[i].mtype,
msgque->messages[i].msize, IPC_NOWAIT) != 0) {
printf("msgsnd failed (%m)\n");
ret = -errno;
goto destroy;
};
}
return 0;
destroy:
if (msgctl(id, IPC_RMID, 0))
printf("Failed to destroy queue: %d\n", -errno);
return ret;
}
int check_and_destroy_queue(struct msgque_data *msgque)
{
struct msg1 message;
int cnt = 0, ret;
while (1) {
ret = msgrcv(msgque->msq_id, &message.mtype, MAX_MSG_SIZE,
0, IPC_NOWAIT);
if (ret < 0) {
if (errno == ENOMSG)
break;
printf("Failed to read IPC message: %m\n");
ret = -errno;
goto err;
}
if (ret != msgque->messages[cnt].msize) {
printf("Wrong message size: %d (expected %d)\n", ret,
msgque->messages[cnt].msize);
ret = -EINVAL;
goto err;
}
if (message.mtype != msgque->messages[cnt].mtype) {
printf("Wrong message type\n");
ret = -EINVAL;
goto err;
}
if (memcmp(message.mtext, msgque->messages[cnt].mtext, ret)) {
printf("Wrong message content\n");
ret = -EINVAL;
goto err;
}
cnt++;
}
if (cnt != msgque->qnum) {
printf("Wrong message number\n");
ret = -EINVAL;
goto err;
}
ret = 0;
err:
if (msgctl(msgque->msq_id, IPC_RMID, 0)) {
printf("Failed to destroy queue: %d\n", -errno);
return -errno;
}
return ret;
}
int dump_queue(struct msgque_data *msgque)
{
struct msqid64_ds ds;
int kern_id;
int i, ret;
for (kern_id = 0; kern_id < 256; kern_id++) {
ret = msgctl(kern_id, MSG_STAT, &ds);
if (ret < 0) {
if (errno == -EINVAL)
continue;
printf("Failed to get stats for IPC queue with id %d\n",
kern_id);
return -errno;
}
if (ret == msgque->msq_id)
break;
}
msgque->messages = malloc(sizeof(struct msg1) * ds.msg_qnum);
if (msgque->messages == NULL) {
printf("Failed to get stats for IPC queue\n");
return -ENOMEM;
}
msgque->qnum = ds.msg_qnum;
msgque->mode = ds.msg_perm.mode;
msgque->qbytes = ds.msg_qbytes;
for (i = 0; i < msgque->qnum; i++) {
ret = msgrcv(msgque->msq_id, &msgque->messages[i].mtype,
MAX_MSG_SIZE, i, IPC_NOWAIT | MSG_COPY);
if (ret < 0) {
printf("Failed to copy IPC message: %m (%d)\n", errno);
return -errno;
}
msgque->messages[i].msize = ret;
}
return 0;
}
int fill_msgque(struct msgque_data *msgque)
{
struct msg1 msgbuf;
msgbuf.mtype = MSG_TYPE;
memcpy(msgbuf.mtext, TEST_STRING, sizeof(TEST_STRING));
if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(TEST_STRING),
IPC_NOWAIT) != 0) {
printf("First message send failed (%m)\n");
return -errno;
};
msgbuf.mtype = ANOTHER_MSG_TYPE;
memcpy(msgbuf.mtext, ANOTHER_TEST_STRING, sizeof(ANOTHER_TEST_STRING));
if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(ANOTHER_TEST_STRING),
IPC_NOWAIT) != 0) {
printf("Second message send failed (%m)\n");
return -errno;
};
return 0;
}
int main(int argc, char **argv)
{
int msg, pid, err;
struct msgque_data msgque;
if (getuid() != 0) {
printf("Please run the test as root - Exiting.\n");
return ksft_exit_fail();
}
msgque.key = ftok(argv[0], 822155650);
if (msgque.key == -1) {
printf("Can't make key: %d\n", -errno);
return ksft_exit_fail();
}
msgque.msq_id = msgget(msgque.key, IPC_CREAT | IPC_EXCL | 0666);
if (msgque.msq_id == -1) {
err = -errno;
printf("Can't create queue: %d\n", err);
goto err_out;
}
err = fill_msgque(&msgque);
if (err) {
printf("Failed to fill queue: %d\n", err);
goto err_destroy;
}
err = dump_queue(&msgque);
if (err) {
printf("Failed to dump queue: %d\n", err);
goto err_destroy;
}
err = check_and_destroy_queue(&msgque);
if (err) {
printf("Failed to check and destroy queue: %d\n", err);
goto err_out;
}
err = restore_queue(&msgque);
if (err) {
printf("Failed to restore queue: %d\n", err);
goto err_destroy;
}
err = check_and_destroy_queue(&msgque);
if (err) {
printf("Failed to test queue: %d\n", err);
goto err_out;
}
return ksft_exit_pass();
err_destroy:
if (msgctl(msgque.msq_id, IPC_RMID, 0)) {
printf("Failed to destroy queue: %d\n", -errno);
return ksft_exit_fail();
}
err_out:
return ksft_exit_fail();
}
|
