1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2019 Federico Bonfiglio <[email protected]>
4 * Copyright (c) Linux Test Project, 2019-2022
5 */
6
7 /*\
8 * [Description]
9 *
10 * Test ioctl_ns with NS_GET_PARENT request.
11 *
12 * Parent process tries to get parent of initial namespace, which should
13 * fail with EPERM because it has no parent.
14 *
15 * Child process has a new pid namespace, which should make the call fail
16 * with EPERM error.
17 */
18
19 #define _GNU_SOURCE
20
21 #include <errno.h>
22 #include <stdlib.h>
23 #include "tst_test.h"
24 #include "lapi/ioctl_ns.h"
25 #include "lapi/sched.h"
26
27 #define STACK_SIZE (1024 * 1024)
28
29 static char *child_stack;
30
setup(void)31 static void setup(void)
32 {
33 int exists = access("/proc/self/ns/pid", F_OK);
34
35 if (exists < 0)
36 tst_res(TCONF, "namespace not available");
37
38 child_stack = ltp_alloc_stack(STACK_SIZE);
39 if (!child_stack)
40 tst_brk(TBROK|TERRNO, "stack alloc");
41 }
42
cleanup(void)43 static void cleanup(void)
44 {
45 free(child_stack);
46 }
47
test_ns_get_parent(void)48 static void test_ns_get_parent(void)
49 {
50 int fd, parent_fd;
51
52 fd = SAFE_OPEN("/proc/self/ns/pid", O_RDONLY);
53 parent_fd = ioctl(fd, NS_GET_PARENT);
54 if (parent_fd == -1) {
55 if (errno == ENOTTY)
56 tst_brk(TCONF, "ioctl(NS_GET_PARENT) not implemented");
57
58 if (errno == EPERM)
59 tst_res(TPASS, "NS_GET_PARENT fails with EPERM");
60 else
61 tst_res(TFAIL | TERRNO, "unexpected ioctl error");
62 } else {
63 tst_res(TFAIL, "call to ioctl succeded");
64 }
65 SAFE_CLOSE(fd);
66 }
67
child(void * arg LTP_ATTRIBUTE_UNUSED)68 static int child(void *arg LTP_ATTRIBUTE_UNUSED)
69 {
70 test_ns_get_parent();
71 return 0;
72 }
73
run(void)74 static void run(void)
75 {
76 test_ns_get_parent();
77
78 if (ltp_clone(CLONE_NEWPID | SIGCHLD, &child, 0,
79 STACK_SIZE, child_stack) == -1)
80 tst_brk(TBROK | TERRNO, "ltp_clone failed");
81 }
82
83 static struct tst_test test = {
84 .test_all = run,
85 .forks_child = 1,
86 .needs_root = 1,
87 .min_kver = "4.9",
88 .setup = setup,
89 .cleanup = cleanup,
90 };
91