cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

proc-self-map-files-001.c (2427B)

      1/*
      2 * Copyright © 2018 Alexey Dobriyan <adobriyan@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/* Test readlink /proc/self/map_files/... */
     17#include <errno.h>
     18#include <sys/types.h>
     19#include <sys/stat.h>
     20#include <fcntl.h>
     21#include <stdio.h>
     22#include <unistd.h>
     23#include <sys/mman.h>
     24#include <stdlib.h>
     25
     26static void pass(const char *fmt, unsigned long a, unsigned long b)
     27{
     28	char name[64];
     29	char buf[64];
     30
     31	snprintf(name, sizeof(name), fmt, a, b);
     32	if (readlink(name, buf, sizeof(buf)) == -1)
     33		exit(1);
     34}
     35
     36static void fail(const char *fmt, unsigned long a, unsigned long b)
     37{
     38	char name[64];
     39	char buf[64];
     40
     41	snprintf(name, sizeof(name), fmt, a, b);
     42	if (readlink(name, buf, sizeof(buf)) == -1 && errno == ENOENT)
     43		return;
     44	exit(1);
     45}
     46
     47int main(void)
     48{
     49	const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
     50	void *p;
     51	int fd;
     52	unsigned long a, b;
     53
     54	fd = open("/dev/zero", O_RDONLY);
     55	if (fd == -1)
     56		return 1;
     57
     58	p = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE, fd, 0);
     59	if (p == MAP_FAILED)
     60		return 1;
     61
     62	a = (unsigned long)p;
     63	b = (unsigned long)p + PAGE_SIZE;
     64
     65	pass("/proc/self/map_files/%lx-%lx", a, b);
     66	fail("/proc/self/map_files/ %lx-%lx", a, b);
     67	fail("/proc/self/map_files/%lx -%lx", a, b);
     68	fail("/proc/self/map_files/%lx- %lx", a, b);
     69	fail("/proc/self/map_files/%lx-%lx ", a, b);
     70	fail("/proc/self/map_files/0%lx-%lx", a, b);
     71	fail("/proc/self/map_files/%lx-0%lx", a, b);
     72	if (sizeof(long) == 4) {
     73		fail("/proc/self/map_files/100000000%lx-%lx", a, b);
     74		fail("/proc/self/map_files/%lx-100000000%lx", a, b);
     75	} else if (sizeof(long) == 8) {
     76		fail("/proc/self/map_files/10000000000000000%lx-%lx", a, b);
     77		fail("/proc/self/map_files/%lx-10000000000000000%lx", a, b);
     78	} else
     79		return 1;
     80
     81	return 0;
     82}