1 /*
2 * Copyright (c) Bull S.A.S. 2008
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
10 * the GNU General Public License for more details.
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
14 *
15 ***************************************************************************
16 * File: pidns31.c
17 *
18 * Description:
19 * This testcase checks if the si_pid is correctly set when a process
20 * that has registered for notification on a posix mqueue is in an
21 * ancestor namespace wrt the process that sends a message to that posix
22 * mqueue.
23 *
24 * Test Assertion & Strategy:
25 * Parent Child
26 * --------------------------------------------------------------------------
27 * Create a POSIX mqueue.
28 * Create a PID namespace container.
29 * Register for notification when a
30 * message arrives in that mqueue
31 * Install a handler for SIGUSR1.
32 * Open that mqueue for writing
33 * Write something to the mqueue.
34 * Inside the handler, check that
35 * si_pid is set to the child's pid
36 *
37 * Usage: <for command-line>
38 * pidns31
39 *
40 * History:
41 * DATE NAME DESCRIPTION
42 * 04/12/08 Nadia Derbey Creation of this test.
43 * <Nadia.Derbey@bull.net>
44 *
45 ******************************************************************************/
46 #ifndef _GNU_SOURCE
47 #define _GNU_SOURCE
48 #endif
49 #include <sys/wait.h>
50 #include <sys/types.h>
51 #include <signal.h>
52 #include <stdlib.h>
53 #include <unistd.h>
54 #include <stdio.h>
55 #include <mqueue.h>
56 #include "linux_syscall_numbers.h"
57 #include "pidns_helper.h"
58 #include "test.h"
59
60 char *TCID = "pidns31";
61 int TST_TOTAL = 1;
62
63 char *mqname = "mq1";
64 int result = TFAIL;
65
66 int father_to_child[2];
67
68 #define CHILD_PID 1
69 #define PARENT_PID 0
70
71 #define MSG "HOW ARE YOU"
72 #define MSG_PRIO 1
73
74 #define NO_STEP -1
75 #define F_STEP_0 0x00
76 #define F_STEP_1 0x01
77 #define F_STEP_2 0x02
78 #define F_STEP_3 0x03
79 #define C_STEP_0 0x10
80 #define C_STEP_1 0x11
81
82 struct notify_info {
83 mqd_t mqd;
84 pid_t pid;
85 };
86
remove_pipe(int * fd)87 static void remove_pipe(int *fd)
88 {
89 close(fd[0]);
90 close(fd[1]);
91 }
92
remove_mqueue(mqd_t mqd)93 static void remove_mqueue(mqd_t mqd)
94 {
95 mq_close(mqd);
96 ltp_syscall(__NR_mq_unlink, mqname);
97 }
98
99 /*
100 * steps F_STEP_XX : called from main
101 * steps C_STEP_XX : called from child_fn
102 */
cleanup_resources(int step,mqd_t mqd)103 static void cleanup_resources(int step, mqd_t mqd)
104 {
105 switch (step) {
106 case C_STEP_1:
107 close(father_to_child[0]);
108 /* fall through */
109 case C_STEP_0:
110 mq_close(mqd);
111 break;
112
113 case F_STEP_3:
114 remove_mqueue(mqd);
115 close(father_to_child[1]);
116 break;
117
118 case F_STEP_2:
119 ltp_syscall(__NR_mq_notify, mqd, NULL);
120 /* fall through */
121 case F_STEP_1:
122 remove_mqueue(mqd);
123 /* fall through */
124 case F_STEP_0:
125 remove_pipe(father_to_child);
126 break;
127 default:
128 tst_resm(TWARN, "Unknown code - no resource removed.");
129 break;
130 }
131 }
132
133 /*
134 * cleanup_mqueue() - performs all ONE TIME cleanup for this test at
135 * completion or premature exit.
136 * step == -1 means no local resource to remove.
137 */
cleanup_mqueue(int result,int step,mqd_t mqd)138 void cleanup_mqueue(int result, int step, mqd_t mqd)
139 {
140 if (step != NO_STEP)
141 cleanup_resources(step, mqd);
142
143 tst_exit();
144 }
145
146 /*
147 * child_fn() - Inside container
148 */
child_fn(void * arg)149 int child_fn(void *arg)
150 {
151 pid_t pid, ppid;
152 mqd_t mqd;
153 char buf[5];
154
155 /* Set process id and parent pid */
156 pid = getpid();
157 ppid = getppid();
158
159 if (pid != CHILD_PID || ppid != PARENT_PID) {
160 tst_resm(TBROK, "cinit: pidns is not created");
161 cleanup_mqueue(TBROK, NO_STEP, 0);
162 }
163
164 /* Close the appropriate end of pipe */
165 close(father_to_child[1]);
166
167 /* Is parent ready to receive a message? */
168 read(father_to_child[0], buf, 5);
169 if (strcmp(buf, "f:ok")) {
170 tst_resm(TBROK, "cinit: parent did not send the message!");
171 cleanup_mqueue(TBROK, NO_STEP, 0);
172 }
173 tst_resm(TINFO, "cinit: my father is ready to receive a message");
174
175 mqd = ltp_syscall(__NR_mq_open, mqname, O_WRONLY, 0, NULL);
176 if (mqd == (mqd_t) - 1) {
177 tst_resm(TBROK, "cinit: mq_open() failed (%s)",
178 strerror(errno));
179 cleanup_mqueue(TBROK, NO_STEP, 0);
180 }
181 tst_resm(TINFO, "cinit: mq_open succeeded");
182
183 if (mq_send(mqd, MSG, strlen(MSG), MSG_PRIO) == (mqd_t) - 1) {
184 tst_resm(TBROK, "cinit: mq_send() failed (%s)",
185 strerror(errno));
186 cleanup_mqueue(TBROK, C_STEP_0, mqd);
187 }
188 tst_resm(TINFO, "cinit: mq_send() succeeded");
189
190 /* Cleanup and exit */
191 cleanup_resources(C_STEP_1, mqd);
192 exit(0);
193 }
194
195 /*
196 * father_signal_handler()
197 */
father_signal_handler(int sig,siginfo_t * si,void * unused)198 static void father_signal_handler(int sig, siginfo_t * si, void *unused)
199 {
200 char buf[256];
201 struct mq_attr attr;
202 struct notify_info *info;
203
204 if (si->si_signo != SIGUSR1) {
205 tst_resm(TBROK, "father: received %s unexpectedly",
206 strsignal(si->si_signo));
207 return;
208 }
209
210 if (si->si_code != SI_MESGQ) {
211 tst_resm(TBROK, "father: expected signal code SI_MESGQ - "
212 "Got %d", si->si_code);
213 return;
214 }
215
216 if (!si->si_ptr) {
217 tst_resm(TBROK, "father: expected si_ptr - Got NULL");
218 return;
219 }
220
221 info = (struct notify_info *)si->si_ptr;
222
223 if (si->si_pid != info->pid) {
224 tst_resm(TFAIL,
225 "father: expected signal originator PID = %d - Got %d",
226 info->pid, si->si_pid);
227 return;
228 }
229
230 tst_resm(TPASS, "father: signal originator PID = %d", si->si_pid);
231 result = TPASS;
232
233 /*
234 * Now read the message - Be silent on errors since this is not the
235 * test purpose.
236 */
237 if (!mq_getattr(info->mqd, &attr))
238 mq_receive(info->mqd, buf, attr.mq_msgsize, NULL);
239 }
240
setup(void)241 static void setup(void)
242 {
243 tst_require_root();
244 check_newpid();
245 }
246
247 /***********************************************************************
248 * M A I N
249 ***********************************************************************/
250
main(int argc,char * argv[])251 int main(int argc, char *argv[])
252 {
253 pid_t cpid;
254 mqd_t mqd;
255 struct sigevent notif;
256 struct sigaction sa;
257 int status;
258 struct notify_info info;
259
260 setup();
261
262 if (pipe(father_to_child) == -1) {
263 tst_resm(TBROK, "parent: pipe() failed. aborting!");
264 cleanup_mqueue(TBROK, NO_STEP, 0);
265 }
266
267 ltp_syscall(__NR_mq_unlink, mqname);
268 mqd =
269 ltp_syscall(__NR_mq_open, mqname, O_RDWR | O_CREAT | O_EXCL, 0777,
270 NULL);
271 if (mqd == (mqd_t) - 1) {
272 tst_resm(TBROK, "parent: mq_open() failed (%s)",
273 strerror(errno));
274 cleanup_mqueue(TBROK, F_STEP_0, 0);
275 }
276 tst_resm(TINFO, "parent: successfully created posix mqueue");
277
278 /* container creation on PID namespace */
279 cpid = ltp_clone_quick(CLONE_NEWPID | SIGCHLD, child_fn, NULL);
280 if (cpid < 0) {
281 tst_resm(TBROK, "parent: clone() failed(%s)", strerror(errno));
282 cleanup_mqueue(TBROK, F_STEP_1, mqd);
283 }
284 tst_resm(TINFO, "parent: successfully created child (pid = %d)", cpid);
285
286 /* Register for notification on message arrival */
287 notif.sigev_notify = SIGEV_SIGNAL;
288 notif.sigev_signo = SIGUSR1;
289 info.mqd = mqd;
290 info.pid = cpid;
291 notif.sigev_value.sival_ptr = &info;
292 if (ltp_syscall(__NR_mq_notify, mqd, ¬if) == (mqd_t) -1) {
293 tst_resm(TBROK, "parent: mq_notify() failed (%s)",
294 strerror(errno));
295 cleanup_mqueue(TBROK, F_STEP_1, mqd);
296 }
297 tst_resm(TINFO, "parent: successfully registered for notification");
298
299 /* Define handler for SIGUSR1 */
300 sa.sa_flags = SA_SIGINFO;
301 sigemptyset(&sa.sa_mask);
302 sa.sa_sigaction = father_signal_handler;
303 if (sigaction(SIGUSR1, &sa, NULL) == -1) {
304 tst_resm(TBROK, "parent: sigaction() failed(%s)",
305 strerror(errno));
306 cleanup_mqueue(TBROK, F_STEP_2, mqd);
307 }
308 tst_resm(TINFO, "parent: successfully registered handler for SIGUSR1");
309
310 /* Close the appropriate end of pipe */
311 close(father_to_child[0]);
312
313 /* Tell the child a message can be sent */
314 if (write(father_to_child[1], "f:ok", 5) != 5) {
315 tst_resm(TBROK, "parent: pipe is broken(%s)", strerror(errno));
316 cleanup_mqueue(TBROK, F_STEP_2, mqd);
317 }
318
319 sleep(3);
320
321 /* Wait for child to finish */
322 if (wait(&status) == -1) {
323 tst_resm(TBROK, "parent: wait() failed(%s)", strerror(errno));
324 cleanup_mqueue(TBROK, F_STEP_1, mqd);
325 }
326
327 cleanup_mqueue(result, F_STEP_3, mqd);
328
329 tst_exit();
330 }
331