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/param.h>
28 #include <errno.h>
29 #include <fcntl.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <unistd.h>
34
35 #include <atf-c.h>
36
37 ATF_TC(realpath_buffer_overflow);
ATF_TC_HEAD(realpath_buffer_overflow,tc)38 ATF_TC_HEAD(realpath_buffer_overflow, tc)
39 {
40 atf_tc_set_md_var(tc, "descr",
41 "Test for out of bounds read from 'left' array "
42 "(compile realpath.c with '-fsanitize=address')");
43 }
44
ATF_TC_BODY(realpath_buffer_overflow,tc)45 ATF_TC_BODY(realpath_buffer_overflow, tc)
46 {
47 char path[MAXPATHLEN] = { 0 };
48 char resb[MAXPATHLEN] = { 0 };
49 size_t i;
50
51 path[0] = 'a';
52 path[1] = '/';
53 for (i = 2; i < sizeof(path) - 1; ++i) {
54 path[i] = 'a';
55 }
56
57 ATF_REQUIRE(realpath(path, resb) == NULL);
58 }
59
60 ATF_TC(realpath_empty_symlink);
ATF_TC_HEAD(realpath_empty_symlink,tc)61 ATF_TC_HEAD(realpath_empty_symlink, tc)
62 {
63 atf_tc_set_md_var(tc, "descr",
64 "Test for correct behavior when encountering empty symlinks");
65 }
66
ATF_TC_BODY(realpath_empty_symlink,tc)67 ATF_TC_BODY(realpath_empty_symlink, tc)
68 {
69 char path[MAXPATHLEN] = { 0 };
70 char slnk[MAXPATHLEN] = { 0 };
71 char resb[MAXPATHLEN] = { 0 };
72 int fd;
73
74 (void)strlcat(slnk, "empty_symlink", sizeof(slnk));
75
76 ATF_REQUIRE(symlink("", slnk) == 0);
77
78 fd = open("aaa", O_RDONLY | O_CREAT, 0600);
79
80 ATF_REQUIRE(fd >= 0);
81 ATF_REQUIRE(close(fd) == 0);
82
83 (void)strlcat(path, "empty_symlink", sizeof(path));
84 (void)strlcat(path, "/aaa", sizeof(path));
85
86 ATF_REQUIRE_ERRNO(ENOENT, realpath(path, resb) == NULL);
87
88 ATF_REQUIRE(unlink("aaa") == 0);
89 ATF_REQUIRE(unlink(slnk) == 0);
90 }
91
ATF_TP_ADD_TCS(tp)92 ATF_TP_ADD_TCS(tp)
93 {
94
95 ATF_TP_ADD_TC(tp, realpath_buffer_overflow);
96 ATF_TP_ADD_TC(tp, realpath_empty_symlink);
97
98 return atf_no_error();
99 }
100