1 // SPDX-License-Identifier: GPL-2.0
2 #define _GNU_SOURCE
3 #include <stdlib.h>
4 #include <stdio.h>
5 #include <string.h>
6 #include <errno.h>
7 #include <sys/msg.h>
8 #include <fcntl.h>
9
10 #include "../kselftest.h"
11
12 #define MAX_MSG_SIZE 32
13
14 struct msg1 {
15 int msize;
16 long mtype;
17 char mtext[MAX_MSG_SIZE];
18 };
19
20 #define TEST_STRING "Test sysv5 msg"
21 #define MSG_TYPE 1
22
23 #define ANOTHER_TEST_STRING "Yet another test sysv5 msg"
24 #define ANOTHER_MSG_TYPE 26538
25
26 struct msgque_data {
27 key_t key;
28 int msq_id;
29 int qbytes;
30 int qnum;
31 int mode;
32 struct msg1 *messages;
33 };
34
35 int restore_queue(struct msgque_data *msgque)
36 {
37 int fd, ret, id, i;
38 char buf[32];
39
40 fd = open("/proc/sys/kernel/msg_next_id", O_WRONLY);
41 if (fd == -1) {
42 printf("Failed to open /proc/sys/kernel/msg_next_id\n");
43 return -errno;
44 }
45 sprintf(buf, "%d", msgque->msq_id);
46
47 ret = write(fd, buf, strlen(buf));
48 if (ret != strlen(buf)) {
49 printf("Failed to write to /proc/sys/kernel/msg_next_id\n");
50 return -errno;
51 }
52
53 id = msgget(msgque->key, msgque->mode | IPC_CREAT | IPC_EXCL);
54 if (id == -1) {
55 printf("Failed to create queue\n");
56 return -errno;
57 }
58
59 if (id != msgque->msq_id) {
60 printf("Restored queue has wrong id (%d instead of %d)\n",
61 id, msgque->msq_id);
62 ret = -EFAULT;
63 goto destroy;
64 }
65
66 for (i = 0; i < msgque->qnum; i++) {
67 if (msgsnd(msgque->msq_id, &msgque->messages[i].mtype,
68 msgque->messages[i].msize, IPC_NOWAIT) != 0) {
69 printf("msgsnd failed (%m)\n");
70 ret = -errno;
71 goto destroy;
72 }
73 }
74 return 0;
75
76 destroy:
77 if (msgctl(id, IPC_RMID, NULL))
78 printf("Failed to destroy queue: %d\n", -errno);
79 return ret;
80 }
81
82 int check_and_destroy_queue(struct msgque_data *msgque)
83 {
84 struct msg1 message;
85 int cnt = 0, ret;
86
87 while (1) {
88 ret = msgrcv(msgque->msq_id, &message.mtype, MAX_MSG_SIZE,
89 0, IPC_NOWAIT);
90 if (ret < 0) {
91 if (errno == ENOMSG)
92 break;
93 printf("Failed to read IPC message: %m\n");
94 ret = -errno;
95 goto err;
96 }
97 if (ret != msgque->messages[cnt].msize) {
98 printf("Wrong message size: %d (expected %d)\n", ret,
99 msgque->messages[cnt].msize);
100 ret = -EINVAL;
101 goto err;
102 }
103 if (message.mtype != msgque->messages[cnt].mtype) {
104 printf("Wrong message type\n");
105 ret = -EINVAL;
106 goto err;
107 }
108 if (memcmp(message.mtext, msgque->messages[cnt].mtext, ret)) {
109 printf("Wrong message content\n");
110 ret = -EINVAL;
111 goto err;
112 }
113 cnt++;
114 }
115
116 if (cnt != msgque->qnum) {
117 printf("Wrong message number\n");
118 ret = -EINVAL;
119 goto err;
120 }
121
122 ret = 0;
123 err:
124 if (msgctl(msgque->msq_id, IPC_RMID, NULL)) {
125 printf("Failed to destroy queue: %d\n", -errno);
126 return -errno;
127 }
128 return ret;
129 }
130
131 int dump_queue(struct msgque_data *msgque)
132 {
133 struct msqid_ds ds;
134 int kern_id;
135 int i, ret;
136
137 for (kern_id = 0; kern_id < 256; kern_id++) {
138 ret = msgctl(kern_id, MSG_STAT, &ds);
139 if (ret < 0) {
140 if (errno == EINVAL)
141 continue;
142 printf("Failed to get stats for IPC queue with id %d\n",
143 kern_id);
144 return -errno;
145 }
146
147 if (ret == msgque->msq_id)
148 break;
149 }
150
151 msgque->messages = malloc(sizeof(struct msg1) * ds.msg_qnum);
152 if (msgque->messages == NULL) {
153 printf("Failed to get stats for IPC queue\n");
154 return -ENOMEM;
155 }
156
157 msgque->qnum = ds.msg_qnum;
158 msgque->mode = ds.msg_perm.mode;
159 msgque->qbytes = ds.msg_qbytes;
160
161 for (i = 0; i < msgque->qnum; i++) {
162 ret = msgrcv(msgque->msq_id, &msgque->messages[i].mtype,
163 MAX_MSG_SIZE, i, IPC_NOWAIT | MSG_COPY);
164 if (ret < 0) {
165 printf("Failed to copy IPC message: %m (%d)\n", errno);
166 return -errno;
167 }
168 msgque->messages[i].msize = ret;
169 }
170 return 0;
171 }
172
173 int fill_msgque(struct msgque_data *msgque)
174 {
175 struct msg1 msgbuf;
176
177 msgbuf.mtype = MSG_TYPE;
178 memcpy(msgbuf.mtext, TEST_STRING, sizeof(TEST_STRING));
179 if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(TEST_STRING),
180 IPC_NOWAIT) != 0) {
181 printf("First message send failed (%m)\n");
182 return -errno;
183 }
184
185 msgbuf.mtype = ANOTHER_MSG_TYPE;
186 memcpy(msgbuf.mtext, ANOTHER_TEST_STRING, sizeof(ANOTHER_TEST_STRING));
187 if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(ANOTHER_TEST_STRING),
188 IPC_NOWAIT) != 0) {
189 printf("Second message send failed (%m)\n");
190 return -errno;
191 }
192 return 0;
193 }
194
195 int main(int argc, char **argv)
196 {
197 int msg, pid, err;
198 struct msgque_data msgque;
199
200 if (getuid() != 0)
201 ksft_exit_skip("Please run the test as root - Exiting.\n");
202
203 msgque.key = ftok(argv[0], 822155650);
204 if (msgque.key == -1) {
205 printf("Can't make key: %d\n", -errno);
206 ksft_exit_fail();
207 }
208
209 msgque.msq_id = msgget(msgque.key, IPC_CREAT | IPC_EXCL | 0666);
210 if (msgque.msq_id == -1) {
211 err = -errno;
212 printf("Can't create queue: %d\n", err);
213 goto err_out;
214 }
215
216 err = fill_msgque(&msgque);
217 if (err) {
218 printf("Failed to fill queue: %d\n", err);
219 goto err_destroy;
220 }
221
222 err = dump_queue(&msgque);
223 if (err) {
224 printf("Failed to dump queue: %d\n", err);
225 goto err_destroy;
226 }
227
228 err = check_and_destroy_queue(&msgque);
229 if (err) {
230 printf("Failed to check and destroy queue: %d\n", err);
231 goto err_out;
232 }
233
234 err = restore_queue(&msgque);
235 if (err) {
236 printf("Failed to restore queue: %d\n", err);
237 goto err_destroy;
238 }
239
240 err = check_and_destroy_queue(&msgque);
241 if (err) {
242 printf("Failed to test queue: %d\n", err);
243 goto err_out;
244 }
245 ksft_exit_pass();
246
247 err_destroy:
248 if (msgctl(msgque.msq_id, IPC_RMID, NULL)) {
249 printf("Failed to destroy queue: %d\n", -errno);
250 ksft_exit_fail();
251 }
252 err_out:
253 ksft_exit_fail();
254 }
255
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