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); 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 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); 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 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 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