1 /*
2 * Copyright (c) 2017 Jan Kokemüller
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <errno.h>
32 #include <fcntl.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37
38 #include <atf-c.h>
39
40 ATF_TC(realpath_buffer_overflow);
ATF_TC_HEAD(realpath_buffer_overflow,tc)41 ATF_TC_HEAD(realpath_buffer_overflow, tc)
42 {
43 atf_tc_set_md_var(tc, "descr",
44 "Test for out of bounds read from 'left' array "
45 "(compile realpath.c with '-fsanitize=address')");
46 }
47
ATF_TC_BODY(realpath_buffer_overflow,tc)48 ATF_TC_BODY(realpath_buffer_overflow, tc)
49 {
50 char path[MAXPATHLEN] = { 0 };
51 char resb[MAXPATHLEN] = { 0 };
52 size_t i;
53
54 path[0] = 'a';
55 path[1] = '/';
56 for (i = 2; i < sizeof(path) - 1; ++i) {
57 path[i] = 'a';
58 }
59
60 ATF_REQUIRE(realpath(path, resb) == NULL);
61 }
62
63 ATF_TC(realpath_empty_symlink);
ATF_TC_HEAD(realpath_empty_symlink,tc)64 ATF_TC_HEAD(realpath_empty_symlink, tc)
65 {
66 atf_tc_set_md_var(tc, "descr",
67 "Test for correct behavior when encountering empty symlinks");
68 }
69
ATF_TC_BODY(realpath_empty_symlink,tc)70 ATF_TC_BODY(realpath_empty_symlink, tc)
71 {
72 char path[MAXPATHLEN] = { 0 };
73 char slnk[MAXPATHLEN] = { 0 };
74 char resb[MAXPATHLEN] = { 0 };
75 int fd;
76
77 (void)strlcat(slnk, "empty_symlink", sizeof(slnk));
78
79 ATF_REQUIRE(symlink("", slnk) == 0);
80
81 fd = open("aaa", O_RDONLY | O_CREAT, 0600);
82
83 ATF_REQUIRE(fd >= 0);
84 ATF_REQUIRE(close(fd) == 0);
85
86 (void)strlcat(path, "empty_symlink", sizeof(path));
87 (void)strlcat(path, "/aaa", sizeof(path));
88
89 ATF_REQUIRE_ERRNO(ENOENT, realpath(path, resb) == NULL);
90
91 ATF_REQUIRE(unlink("aaa") == 0);
92 ATF_REQUIRE(unlink(slnk) == 0);
93 }
94
ATF_TP_ADD_TCS(tp)95 ATF_TP_ADD_TCS(tp)
96 {
97
98 ATF_TP_ADD_TC(tp, realpath_buffer_overflow);
99 ATF_TP_ADD_TC(tp, realpath_empty_symlink);
100
101 return atf_no_error();
102 }
103