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1/*2 * Copyright (c) 2019 Alexey Dobriyan <adobriyan@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/* 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#include "../kselftest.h"27 28int main(void)29{30 int fd, rv;31 32 ksft_print_header();33 ksft_set_plan(1);34 35 if (unshare(CLONE_NEWNS) == -1) {36 if (errno == ENOSYS || errno == EPERM) {37 ksft_test_result_skip("error: unshare, errno %d\n", errno);38 ksft_finished();39 }40 ksft_exit_fail_perror("error: unshare");41 }42 43 if (mount(NULL, "/", NULL, MS_PRIVATE | MS_REC, NULL) == -1)44 ksft_exit_fail_perror("error: mount '/'");45 46 /* Require "exec" filesystem. */47 if (mount(NULL, "/tmp", "ramfs", 0, NULL) == -1)48 ksft_exit_fail_perror("error: mount ramfs");49 50#define FILENAME "/tmp/1"51 52 fd = creat(FILENAME, 0700);53 if (fd == -1)54 ksft_exit_fail_perror("error: creat");55 56#define S "#!" FILENAME "\n"57 if (write(fd, S, strlen(S)) != strlen(S))58 ksft_exit_fail_perror("error: write");59 60 close(fd);61 62 rv = execve(FILENAME, NULL, NULL);63 ksft_test_result(rv == -1 && errno == ELOOP,64 "execve failed as expected (ret %d, errno %d)\n", rv, errno);65 ksft_finished();66}67