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
| /*
| * Copyright © 2020 Alexey Gladkov <gladkov.alexey@gmail.com>
| *
| * Permission to use, copy, modify, and distribute this software for any
| * purpose with or without fee is hereby granted, provided that the above
| * copyright notice and this permission notice appear in all copies.
| *
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
| */
| #include <assert.h>
| #include <unistd.h>
| #include <stdlib.h>
| #include <errno.h>
| #include <linux/mount.h>
| #include <linux/unistd.h>
|
| static inline int fsopen(const char *fsname, unsigned int flags)
| {
| return syscall(__NR_fsopen, fsname, flags);
| }
|
| static inline int fsconfig(int fd, unsigned int cmd, const char *key, const void *val, int aux)
| {
| return syscall(__NR_fsconfig, fd, cmd, key, val, aux);
| }
|
| int main(void)
| {
| int fsfd, ret;
| int hidepid = 2;
|
| assert((fsfd = fsopen("proc", 0)) != -1);
|
| ret = fsconfig(fsfd, FSCONFIG_SET_BINARY, "hidepid", &hidepid, 0);
| assert(ret == -1);
| assert(errno == EINVAL);
|
| assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "2", 0));
| assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "invisible", 0));
|
| assert(!close(fsfd));
|
| return 0;
| }
|
|
