/* * Copyright (c) 2019 Alexey Dobriyan <adobriyan@gmail.com> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *//* Test that pointing #! script interpreter to self doesn't recurse. */#include <errno.h>#include <sched.h>#include <stdio.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <sys/mount.h>#include <unistd.h>#include "kselftest.h" int main(void){	int fd, rv; 	ksft_print_header();	ksft_set_plan(1); 	if (unshare(CLONE_NEWNS) == -1) {		if (errno == ENOSYS || errno == EPERM) {			ksft_test_result_skip("error: unshare, errno %d\n", errno);			ksft_finished();		}		ksft_exit_fail_perror("error: unshare");	} 	if (mount(NULL, "/", NULL, MS_PRIVATE | MS_REC, NULL) == -1)		ksft_exit_fail_perror("error: mount '/'"); 	/* Require "exec" filesystem. */	if (mount(NULL, "/tmp", "ramfs", 0, NULL) == -1)		ksft_exit_fail_perror("error: mount ramfs"); #define FILENAME "/tmp/1" 	fd = creat(FILENAME, 0700);	if (fd == -1)		ksft_exit_fail_perror("error: creat"); #define S "#!" FILENAME "\n"	if (write(fd, S, strlen(S)) != strlen(S))		ksft_exit_fail_perror("error: write"); 	close(fd); 	rv = execve(FILENAME, NULL, NULL);	ksft_test_result(rv == -1 && errno == ELOOP,			 "execve failed as expected (ret %d, errno %d)\n", rv, errno);	ksft_finished();}