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-multiple-procfs.c (1595B)

      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 <stdlib.h>
     18#include <stdio.h>
     19#include <sys/mount.h>
     20#include <sys/types.h>
     21#include <sys/stat.h>
     22
     23int main(void)
     24{
     25	struct stat proc_st1, proc_st2;
     26	char procbuff[] = "/tmp/proc.XXXXXX/meminfo";
     27	char procdir1[] = "/tmp/proc.XXXXXX";
     28	char procdir2[] = "/tmp/proc.XXXXXX";
     29
     30	assert(mkdtemp(procdir1) != NULL);
     31	assert(mkdtemp(procdir2) != NULL);
     32
     33	assert(!mount("proc", procdir1, "proc", 0, "hidepid=1"));
     34	assert(!mount("proc", procdir2, "proc", 0, "hidepid=2"));
     35
     36	snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir1);
     37	assert(!stat(procbuff, &proc_st1));
     38
     39	snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir2);
     40	assert(!stat(procbuff, &proc_st2));
     41
     42	umount(procdir1);
     43	umount(procdir2);
     44
     45	assert(proc_st1.st_dev != proc_st2.st_dev);
     46
     47	return 0;
     48}