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1 | /* Testcase for BZ 30932. |
2 | Copyright (C) 2023 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <setjmp.h> | |
21 | #include <stdbool.h> | |
22 | #include <stdio.h> | |
23 | #include <string.h> | |
24 | #include <sys/resource.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | #include <support/check.h> | |
28 | #include <support/support.h> | |
29 | #include <support/temp_file.h> | |
30 | ||
31 | jmp_buf chk_fail_buf; | |
32 | bool chk_fail_ok; | |
33 | ||
34 | const char *str2 = "F"; | |
35 | char buf2[10] = "%s"; | |
36 | ||
37 | static int | |
38 | do_test (void) | |
39 | { | |
40 | struct rlimit rl; | |
41 | int max_fd = 24; | |
42 | ||
43 | if (getrlimit (RLIMIT_NOFILE, &rl) == -1) | |
44 | FAIL_EXIT1 ("getrlimit (RLIMIT_NOFILE): %m"); | |
45 | ||
46 | max_fd = (rl.rlim_cur < max_fd ? rl.rlim_cur : max_fd); | |
47 | rl.rlim_cur = max_fd; | |
48 | ||
49 | if (setrlimit (RLIMIT_NOFILE, &rl) == 1) | |
50 | FAIL_EXIT1 ("setrlimit (RLIMIT_NOFILE): %m"); | |
51 | ||
52 | /* Exhaust the file descriptor limit with temporary files. */ | |
53 | int nfiles = 0; | |
54 | for (; nfiles < max_fd; nfiles++) | |
55 | { | |
56 | int fd = create_temp_file ("tst-sprintf-fortify-rdonly-.", NULL); | |
57 | if (fd == -1) | |
58 | { | |
59 | if (errno != EMFILE) | |
60 | FAIL_EXIT1 ("create_temp_file: %m"); | |
61 | break; | |
62 | } | |
63 | } | |
64 | TEST_VERIFY_EXIT (nfiles != 0); | |
65 | ||
66 | /* When the format string is writable and contains %n, | |
67 | with -D_FORTIFY_SOURCE=2 it causes __chk_fail. However, if libc can not | |
68 | open procfs to check if the input format string in within a writable | |
69 | memory segment, the fortify version can not perform the check. */ | |
70 | char buf[128]; | |
71 | int n1; | |
72 | int n2; | |
73 | ||
74 | strcpy (buf2 + 2, "%n%s%n"); | |
75 | if (sprintf (buf, buf2, str2, &n1, str2, &n2) != 2 | |
76 | || n1 != 1 || n2 != 2) | |
77 | FAIL_EXIT1 ("sprintf failed: %s %d %d", buf, n1, n2); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | #include <support/test-driver.c> |