1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2014 Red Hat, Inc. All rights reserved.
4 * Copyright (C) 2022 SUSE LLC Andrea Cervesato <[email protected]>
5 */
6
7 /*\
8 * [Description]
9 *
10 * Clone a process with CLONE_NEWPID flag and check if procfs mounted folder
11 * belongs to the new pid namespace by looking at /proc/self .
12 */
13
14 #include <sys/mount.h>
15 #include "tst_test.h"
16 #include "lapi/sched.h"
17
18 #define PROCDIR "proc"
19
child_func(void)20 static void child_func(void)
21 {
22 char proc_self[10];
23
24 SAFE_MOUNT("none", PROCDIR, "proc", MS_RDONLY, NULL);
25
26 SAFE_READLINK(PROCDIR"/self", proc_self, sizeof(proc_self) - 1);
27
28 SAFE_UMOUNT(PROCDIR);
29
30 TST_EXP_PASS(strcmp(proc_self, "1"), PROCDIR"/self contains 1:");
31 }
32
setup(void)33 static void setup(void)
34 {
35 SAFE_MKDIR(PROCDIR, 0555);
36 }
37
cleanup(void)38 static void cleanup(void)
39 {
40 if (tst_is_mounted_at_tmpdir(PROCDIR))
41 SAFE_UMOUNT(PROCDIR);
42 }
43
run(void)44 static void run(void)
45 {
46 const struct tst_clone_args args = {
47 .flags = CLONE_NEWPID,
48 .exit_signal = SIGCHLD,
49 };
50
51 if (!SAFE_CLONE(&args)) {
52 child_func();
53 return;
54 }
55 }
56
57 static struct tst_test test = {
58 .test_all = run,
59 .setup = setup,
60 .cleanup = cleanup,
61 .needs_root = 1,
62 .forks_child = 1,
63 .needs_tmpdir = 1,
64 .needs_kconfigs = (const char *[]) {
65 "CONFIG_PID_NS",
66 NULL,
67 },
68 };
69