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 #include "../kselftest.h" 27 28 int 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