1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2019 Federico Bonfiglio fedebonfi95@gmail.com
4 */
5
6 /*
7 * Test ioctl_ns with NS_GET_PARENT request.
8 *
9 * Parent process tries to get parent of initial namespace, which should
10 * fail with EPERM because it has no parent.
11 *
12 * Child process has a new pid namespace, which should make the call fail
13 * with EPERM error.
14 *
15 */
16 #define _GNU_SOURCE
17
18 #include <errno.h>
19 #include <sched.h>
20 #include <stdlib.h>
21 #include "tst_test.h"
22 #include "lapi/ioctl_ns.h"
23 #include "lapi/namespaces_constants.h"
24
25 #define STACK_SIZE (1024 * 1024)
26
27 static char *child_stack;
28
setup(void)29 static void setup(void)
30 {
31 int exists = access("/proc/self/ns/pid", F_OK);
32
33 if (exists < 0)
34 tst_res(TCONF, "namespace not available");
35
36 child_stack = ltp_alloc_stack(STACK_SIZE);
37 if (!child_stack)
38 tst_brk(TBROK|TERRNO, "stack alloc");
39 }
40
cleanup(void)41 static void cleanup(void)
42 {
43 free(child_stack);
44 }
45
test_ns_get_parent(void)46 static void test_ns_get_parent(void)
47 {
48 int fd, parent_fd;
49
50 fd = SAFE_OPEN("/proc/self/ns/pid", O_RDONLY);
51 parent_fd = ioctl(fd, NS_GET_PARENT);
52 if (parent_fd == -1) {
53 if (errno == ENOTTY)
54 tst_brk(TCONF, "ioctl(NS_GET_PARENT) not implemented");
55
56 if (errno == EPERM)
57 tst_res(TPASS, "NS_GET_PARENT fails with EPERM");
58 else
59 tst_res(TFAIL | TERRNO, "unexpected ioctl error");
60 } else {
61 SAFE_CLOSE(fd);
62 tst_res(TFAIL, "call to ioctl succeded");
63 }
64 }
65
child(void * arg LTP_ATTRIBUTE_UNUSED)66 static int child(void *arg LTP_ATTRIBUTE_UNUSED)
67 {
68 test_ns_get_parent();
69 return 0;
70 }
71
run(void)72 static void run(void)
73 {
74 test_ns_get_parent();
75
76 if (ltp_clone(CLONE_NEWPID | SIGCHLD, &child, 0,
77 STACK_SIZE, child_stack) == -1)
78 tst_brk(TBROK | TERRNO, "ltp_clone failed");
79 }
80
81 static struct tst_test test = {
82 .test_all = run,
83 .forks_child = 1,
84 .needs_root = 1,
85 .min_kver = "4.9",
86 .setup = setup,
87 .cleanup = cleanup,
88 };
89