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
restore_queue(struct msgque_data * msgque)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 ksft_test_result_fail("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 ksft_test_result_fail("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 ksft_test_result_fail("Failed to create queue\n");
56 return -errno;
57 }
58
59 if (id != msgque->msq_id) {
60 ksft_test_result_fail("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 ksft_test_result_fail("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
check_and_destroy_queue(struct msgque_data * msgque)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 ksft_test_result_fail("Failed to read IPC message: %m\n");
94 ret = -errno;
95 goto err;
96 }
97 if (ret != msgque->messages[cnt].msize) {
98 ksft_test_result_fail("Wrong message size: %d (expected %d)\n", ret, msgque->messages[cnt].msize);
99 ret = -EINVAL;
100 goto err;
101 }
102 if (message.mtype != msgque->messages[cnt].mtype) {
103 ksft_test_result_fail("Wrong message type\n");
104 ret = -EINVAL;
105 goto err;
106 }
107 if (memcmp(message.mtext, msgque->messages[cnt].mtext, ret)) {
108 ksft_test_result_fail("Wrong message content\n");
109 ret = -EINVAL;
110 goto err;
111 }
112 cnt++;
113 }
114
115 if (cnt != msgque->qnum) {
116 ksft_test_result_fail("Wrong message number\n");
117 ret = -EINVAL;
118 goto err;
119 }
120
121 ret = 0;
122 err:
123 if (msgctl(msgque->msq_id, IPC_RMID, NULL)) {
124 printf("Failed to destroy queue: %d\n", -errno);
125 return -errno;
126 }
127 return ret;
128 }
129
dump_queue(struct msgque_data * msgque)130 int dump_queue(struct msgque_data *msgque)
131 {
132 struct msqid_ds ds;
133 int kern_id;
134 int i, ret;
135
136 for (kern_id = 0; kern_id < 256; kern_id++) {
137 ret = msgctl(kern_id, MSG_STAT, &ds);
138 if (ret < 0) {
139 if (errno == EINVAL)
140 continue;
141 ksft_test_result_fail("Failed to get stats for IPC queue with id %d\n",
142 kern_id);
143 return -errno;
144 }
145
146 if (ret == msgque->msq_id)
147 break;
148 }
149
150 msgque->messages = malloc(sizeof(struct msg1) * ds.msg_qnum);
151 if (msgque->messages == NULL) {
152 ksft_test_result_fail("Failed to get stats for IPC queue\n");
153 return -ENOMEM;
154 }
155
156 msgque->qnum = ds.msg_qnum;
157 msgque->mode = ds.msg_perm.mode;
158 msgque->qbytes = ds.msg_qbytes;
159
160 for (i = 0; i < msgque->qnum; i++) {
161 ret = msgrcv(msgque->msq_id, &msgque->messages[i].mtype,
162 MAX_MSG_SIZE, i, IPC_NOWAIT | MSG_COPY);
163 if (ret < 0) {
164 ksft_test_result_fail("Failed to copy IPC message: %m (%d)\n", errno);
165 return -errno;
166 }
167 msgque->messages[i].msize = ret;
168 }
169 return 0;
170 }
171
fill_msgque(struct msgque_data * msgque)172 int fill_msgque(struct msgque_data *msgque)
173 {
174 struct msg1 msgbuf;
175
176 msgbuf.mtype = MSG_TYPE;
177 memcpy(msgbuf.mtext, TEST_STRING, sizeof(TEST_STRING));
178 if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(TEST_STRING),
179 IPC_NOWAIT) != 0) {
180 ksft_test_result_fail("First message send failed (%m)\n");
181 return -errno;
182 }
183
184 msgbuf.mtype = ANOTHER_MSG_TYPE;
185 memcpy(msgbuf.mtext, ANOTHER_TEST_STRING, sizeof(ANOTHER_TEST_STRING));
186 if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(ANOTHER_TEST_STRING),
187 IPC_NOWAIT) != 0) {
188 ksft_test_result_fail("Second message send failed (%m)\n");
189 return -errno;
190 }
191 return 0;
192 }
193
main(int argc,char ** argv)194 int main(int argc, char **argv)
195 {
196 int err;
197 struct msgque_data msgque;
198
199 if (getuid() != 0)
200 ksft_exit_skip("Please run the test as root - Exiting.\n");
201
202 msgque.key = ftok(argv[0], 822155650);
203 if (msgque.key == -1) {
204 ksft_test_result_fail("Can't make key: %d\n", -errno);
205 ksft_exit_fail();
206 }
207
208 msgque.msq_id = msgget(msgque.key, IPC_CREAT | IPC_EXCL | 0666);
209 if (msgque.msq_id == -1) {
210 err = -errno;
211 ksft_test_result_fail("Can't create queue: %d\n", err);
212 goto err_out;
213 }
214
215 err = fill_msgque(&msgque);
216 if (err) {
217 ksft_test_result_fail("Failed to fill queue: %d\n", err);
218 goto err_destroy;
219 }
220
221 err = dump_queue(&msgque);
222 if (err) {
223 ksft_test_result_fail("Failed to dump queue: %d\n", err);
224 goto err_destroy;
225 }
226
227 err = check_and_destroy_queue(&msgque);
228 if (err) {
229 ksft_test_result_fail("Failed to check and destroy queue: %d\n", err);
230 goto err_out;
231 }
232
233 err = restore_queue(&msgque);
234 if (err) {
235 ksft_test_result_fail("Failed to restore queue: %d\n", err);
236 goto err_destroy;
237 }
238
239 err = check_and_destroy_queue(&msgque);
240 if (err) {
241 ksft_test_result_fail("Failed to test queue: %d\n", err);
242 goto err_out;
243 }
244 ksft_exit_pass();
245
246 err_destroy:
247 if (msgctl(msgque.msq_id, IPC_RMID, NULL)) {
248 printf("Failed to destroy queue: %d\n", -errno);
249 ksft_exit_fail();
250 }
251 err_out:
252 ksft_exit_fail();
253 }
254