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| 2 | * Copyright © 2020 Alexey Gladkov <[email protected]>
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| 3 | *
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| 4 | * Permission to use, copy, modify, and distribute this software for any
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| 5 | * purpose with or without fee is hereby granted, provided that the above
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| 6 | * copyright notice and this permission notice appear in all copies.
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| 7 | *
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| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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| 9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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| 10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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| 11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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| 13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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| 14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 15 |
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| 16 | #include <assert.h>
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| 17 | #include <unistd.h>
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| 18 | #include <stdlib.h>
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| 19 | #include <errno.h>
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| 20 | #include <linux/mount.h>
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| 21 | #include <linux/unistd.h>
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| 22 |
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| 23 | static inline int fsopen(const char *fsname, unsigned int flags)
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| 24 | {
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| 25 | return syscall(__NR_fsopen, fsname, flags);
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| 26 | }
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| 27 |
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| 28 | static inline int fsconfig(int fd, unsigned int cmd, const char *key, const void *val, int aux)
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| 29 | {
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| 30 | return syscall(__NR_fsconfig, fd, cmd, key, val, aux);
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| 31 | }
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| 32 |
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| 33 | int main(void)
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| 34 | {
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| 35 | int fsfd, ret;
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| 36 | int hidepid = 2;
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| 37 |
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| 38 | assert((fsfd = fsopen("proc", 0)) != -1);
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| 39 |
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| 40 | ret = fsconfig(fsfd, FSCONFIG_SET_BINARY, "hidepid", &hidepid, 0);
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| 41 | assert(ret == -1);
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| 42 | assert(errno == EINVAL);
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| 43 |
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| 44 | assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "2", 0));
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| 45 | assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "invisible", 0));
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| 46 |
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| 47 | assert(!close(fsfd));
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| 48 |
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| 49 | return 0;
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| 50 | }
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