cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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proc-fsconfig-hidepid.c (1591B)

      1/*
      2 * Copyright © 2020 Alexey Gladkov <gladkov.alexey@gmail.com>
      3 *
      4 * Permission to use, copy, modify, and distribute this software for any
      5 * purpose with or without fee is hereby granted, provided that the above
      6 * copyright notice and this permission notice appear in all copies.
      7 *
      8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     14 * 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}