2 * Copyright © 2019 Alexey Dobriyan <adobriyan@gmail.com>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * Test that setns(CLONE_NEWIPC) points to new /proc/sysvipc content even
18 * if old one is in dcache.
29 #include <sys/types.h>
35 static pid_t pid = -1;
52 /* Check for priviledges and syscall availability straight away. */
53 if (unshare(CLONE_NEWIPC) == -1) {
54 if (errno == ENOSYS || errno == EPERM) {
59 /* Distinguisher between two otherwise empty IPC namespaces. */
60 if (shmget(IPC_PRIVATE, 1, IPC_CREAT) == -1) {
74 if (unshare(CLONE_NEWIPC) == -1) {
78 if (write(fd[1], &_, 1) != 1) {
87 if (read(fd[0], &_, 1) != 1) {
93 snprintf(buf, sizeof(buf), "/proc/%u/ns/ipc", pid);
94 nsfd = open(buf, O_RDONLY);
100 /* Reliably pin dentry into dcache. */
101 (void)open("/proc/sysvipc/shm", O_RDONLY);
103 if (setns(nsfd, CLONE_NEWIPC) == -1) {
115 fd = open("/proc/sysvipc/shm", O_RDONLY);
120 #define S32 " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n"
121 #define S64 " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n"
122 rv = read(fd, buf, sizeof(buf));
123 if (rv == strlen(S32)) {
124 assert(memcmp(buf, S32, strlen(S32)) == 0);
125 } else if (rv == strlen(S64)) {
126 assert(memcmp(buf, S64, strlen(S64)) == 0);