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

recursion-depth.c (2060B)

      1/*
      2 * Copyright (c) 2019 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 that pointing #! script interpreter to self doesn't recurse. */
     17#include <errno.h>
     18#include <sched.h>
     19#include <stdio.h>
     20#include <string.h>
     21#include <sys/types.h>
     22#include <sys/stat.h>
     23#include <fcntl.h>
     24#include <sys/mount.h>
     25#include <unistd.h>
     26
     27int main(void)
     28{
     29	if (unshare(CLONE_NEWNS) == -1) {
     30		if (errno == ENOSYS || errno == EPERM) {
     31			fprintf(stderr, "error: unshare, errno %d\n", errno);
     32			return 4;
     33		}
     34		fprintf(stderr, "error: unshare, errno %d\n", errno);
     35		return 1;
     36	}
     37	if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {
     38		fprintf(stderr, "error: mount '/', errno %d\n", errno);
     39		return 1;
     40	}
     41	/* Require "exec" filesystem. */
     42	if (mount(NULL, "/tmp", "ramfs", 0, NULL) == -1) {
     43		fprintf(stderr, "error: mount ramfs, errno %d\n", errno);
     44		return 1;
     45	}
     46
     47#define FILENAME "/tmp/1"
     48
     49	int fd = creat(FILENAME, 0700);
     50	if (fd == -1) {
     51		fprintf(stderr, "error: creat, errno %d\n", errno);
     52		return 1;
     53	}
     54#define S "#!" FILENAME "\n"
     55	if (write(fd, S, strlen(S)) != strlen(S)) {
     56		fprintf(stderr, "error: write, errno %d\n", errno);
     57		return 1;
     58	}
     59	close(fd);
     60
     61	int rv = execve(FILENAME, NULL, NULL);
     62	if (rv == -1 && errno == ELOOP) {
     63		return 0;
     64	}
     65	fprintf(stderr, "error: execve, rv %d, errno %d\n", rv, errno);
     66	return 1;
     67}