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1/*2 * Copyright © 2020 Alexey Gladkov <gladkov.alexey@gmail.com>3 *4 * Permission to use, copy, modify, and distribute this software for any5 * purpose with or without fee is hereby granted, provided that the above6 * copyright notice and this permission notice appear in all copies.7 *8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.15 */16#include <assert.h>17#include <unistd.h>18#include <stdlib.h>19#include <errno.h>20#include <linux/mount.h>21#include <linux/unistd.h>22 23static inline int fsopen(const char *fsname, unsigned int flags)24{25 return syscall(__NR_fsopen, fsname, flags);26}27 28static inline int fsconfig(int fd, unsigned int cmd, const char *key, const void *val, int aux)29{30 return syscall(__NR_fsconfig, fd, cmd, key, val, aux);31}32 33int main(void)34{35 int fsfd, ret;36 int hidepid = 2;37 38 assert((fsfd = fsopen("proc", 0)) != -1);39 40 ret = fsconfig(fsfd, FSCONFIG_SET_BINARY, "hidepid", &hidepid, 0);41 assert(ret == -1);42 assert(errno == EINVAL);43 44 assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "2", 0));45 assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "invisible", 0));46 47 assert(!close(fsfd));48 49 return 0;50}51