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
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