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 #include <sys/param.h> 29 #include <errno.h> 30 #include <fcntl.h> 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <unistd.h> 35 36 #include <atf-c.h> 37 38 ATF_TC(realpath_buffer_overflow); 39 ATF_TC_HEAD(realpath_buffer_overflow, tc) 40 { 41 atf_tc_set_md_var(tc, "descr", 42 "Test for out of bounds read from 'left' array " 43 "(compile realpath.c with '-fsanitize=address')"); 44 } 45 46 ATF_TC_BODY(realpath_buffer_overflow, tc) 47 { 48 char path[MAXPATHLEN] = { 0 }; 49 char resb[MAXPATHLEN] = { 0 }; 50 size_t i; 51 52 path[0] = 'a'; 53 path[1] = '/'; 54 for (i = 2; i < sizeof(path) - 1; ++i) { 55 path[i] = 'a'; 56 } 57 58 ATF_REQUIRE(realpath(path, resb) == NULL); 59 } 60 61 ATF_TC(realpath_empty_symlink); 62 ATF_TC_HEAD(realpath_empty_symlink, tc) 63 { 64 atf_tc_set_md_var(tc, "descr", 65 "Test for correct behavior when encountering empty symlinks"); 66 } 67 68 ATF_TC_BODY(realpath_empty_symlink, tc) 69 { 70 char path[MAXPATHLEN] = { 0 }; 71 char slnk[MAXPATHLEN] = { 0 }; 72 char resb[MAXPATHLEN] = { 0 }; 73 int fd; 74 75 (void)strlcat(slnk, "empty_symlink", sizeof(slnk)); 76 77 ATF_REQUIRE(symlink("", slnk) == 0); 78 79 fd = open("aaa", O_RDONLY | O_CREAT, 0600); 80 81 ATF_REQUIRE(fd >= 0); 82 ATF_REQUIRE(close(fd) == 0); 83 84 (void)strlcat(path, "empty_symlink", sizeof(path)); 85 (void)strlcat(path, "/aaa", sizeof(path)); 86 87 ATF_REQUIRE_ERRNO(ENOENT, realpath(path, resb) == NULL); 88 89 ATF_REQUIRE(unlink("aaa") == 0); 90 ATF_REQUIRE(unlink(slnk) == 0); 91 } 92 93 ATF_TP_ADD_TCS(tp) 94 { 95 96 ATF_TP_ADD_TC(tp, realpath_buffer_overflow); 97 ATF_TP_ADD_TC(tp, realpath_empty_symlink); 98 99 return atf_no_error(); 100 } 101