1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
| // SPDX-License-Identifier: GPL-2.0
| /* Copyright (c) 2020 Facebook */
| #define _GNU_SOURCE
| #include <sched.h>
| #include <sys/mount.h>
| #include <sys/stat.h>
| #include <sys/types.h>
| #include <test_progs.h>
|
| #define TDIR "/sys/kernel/debug"
|
| static int read_iter(char *file)
| {
| /* 1024 should be enough to get contiguous 4 "iter" letters at some point */
| char buf[1024];
| int fd, len;
|
| fd = open(file, 0);
| if (fd < 0)
| return -1;
| while ((len = read(fd, buf, sizeof(buf))) > 0)
| if (strstr(buf, "iter")) {
| close(fd);
| return 0;
| }
| close(fd);
| return -1;
| }
|
| static int fn(void)
| {
| int err, duration = 0;
|
| err = unshare(CLONE_NEWNS);
| if (CHECK(err, "unshare", "failed: %d\n", errno))
| goto out;
|
| err = mount("", "/", "", MS_REC | MS_PRIVATE, NULL);
| if (CHECK(err, "mount /", "failed: %d\n", errno))
| goto out;
|
| err = umount(TDIR);
| if (CHECK(err, "umount " TDIR, "failed: %d\n", errno))
| goto out;
|
| err = mount("none", TDIR, "tmpfs", 0, NULL);
| if (CHECK(err, "mount", "mount root failed: %d\n", errno))
| goto out;
|
| err = mkdir(TDIR "/fs1", 0777);
| if (CHECK(err, "mkdir "TDIR"/fs1", "failed: %d\n", errno))
| goto out;
| err = mkdir(TDIR "/fs2", 0777);
| if (CHECK(err, "mkdir "TDIR"/fs2", "failed: %d\n", errno))
| goto out;
|
| err = mount("bpf", TDIR "/fs1", "bpf", 0, NULL);
| if (CHECK(err, "mount bpffs "TDIR"/fs1", "failed: %d\n", errno))
| goto out;
| err = mount("bpf", TDIR "/fs2", "bpf", 0, NULL);
| if (CHECK(err, "mount bpffs " TDIR "/fs2", "failed: %d\n", errno))
| goto out;
|
| err = read_iter(TDIR "/fs1/maps.debug");
| if (CHECK(err, "reading " TDIR "/fs1/maps.debug", "failed\n"))
| goto out;
| err = read_iter(TDIR "/fs2/progs.debug");
| if (CHECK(err, "reading " TDIR "/fs2/progs.debug", "failed\n"))
| goto out;
| out:
| umount(TDIR "/fs1");
| umount(TDIR "/fs2");
| rmdir(TDIR "/fs1");
| rmdir(TDIR "/fs2");
| umount(TDIR);
| exit(err);
| }
|
| void test_test_bpffs(void)
| {
| int err, duration = 0, status = 0;
| pid_t pid;
|
| pid = fork();
| if (CHECK(pid == -1, "clone", "clone failed %d", errno))
| return;
| if (pid == 0)
| fn();
| err = waitpid(pid, &status, 0);
| if (CHECK(err == -1 && errno != ECHILD, "waitpid", "failed %d", errno))
| return;
| if (CHECK(WEXITSTATUS(status), "bpffs test ", "failed %d", WEXITSTATUS(status)))
| return;
| }
|
|
