1 /*- 2 * Copyright (c) 2009 Simon L. Nielsen <simon@FreeBSD.org>, 3 * Bjoern A. Zeeb <bz@FreeBSD.org> 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 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/mman.h> 31 #include <sys/sysctl.h> 32 33 #include <atf-c.h> 34 #include <errno.h> 35 #include <fcntl.h> 36 #include <stdarg.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 40 static const struct { 41 void *addr; 42 int ok[2]; /* Depending on security.bsd.map_at_zero {0, !=0}. */ 43 } map_at_zero_tests[] = { 44 { (void *)0, { 0, 1 } }, /* Test sysctl. */ 45 { (void *)1, { 0, 0 } }, 46 { (void *)(PAGE_SIZE - 1), { 0, 0 } }, 47 { (void *)PAGE_SIZE, { 1, 1 } }, 48 { (void *)-1, { 0, 0 } }, 49 { (void *)(-PAGE_SIZE), { 0, 0 } }, 50 { (void *)(-1 - PAGE_SIZE), { 0, 0 } }, 51 { (void *)(-1 - PAGE_SIZE - 1), { 0, 0 } }, 52 { (void *)(0x1000 * PAGE_SIZE), { 1, 1 } }, 53 }; 54 55 #define MAP_AT_ZERO "security.bsd.map_at_zero" 56 57 ATF_TC_WITHOUT_HEAD(mmap__map_at_zero); 58 ATF_TC_BODY(mmap__map_at_zero, tc) 59 { 60 void *p; 61 size_t len; 62 unsigned int i; 63 int map_at_zero; 64 65 len = sizeof(map_at_zero); 66 if (sysctlbyname(MAP_AT_ZERO, &map_at_zero, &len, NULL, 0) == -1) { 67 atf_tc_skip("sysctl for %s failed: %s\n", MAP_AT_ZERO, 68 strerror(errno)); 69 return; 70 } 71 72 /* Normalize to 0 or 1 for array access. */ 73 map_at_zero = !!map_at_zero; 74 75 for (i = 0; i < nitems(map_at_zero_tests); i++) { 76 p = mmap((void *)map_at_zero_tests[i].addr, PAGE_SIZE, 77 PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_FIXED, 78 -1, 0); 79 if (p == MAP_FAILED) { 80 ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 0, 81 "mmap(%p, ...) failed", map_at_zero_tests[i].addr); 82 } else { 83 ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 1, 84 "mmap(%p, ...) succeeded: p=%p\n", 85 map_at_zero_tests[i].addr, p); 86 } 87 } 88 } 89 90 static void 91 checked_mmap(int prot, int flags, int fd, int error, const char *msg) 92 { 93 void *p; 94 95 p = mmap(NULL, getpagesize(), prot, flags, fd, 0); 96 if (p == MAP_FAILED) { 97 if (error == 0) 98 ATF_CHECK_MSG(0, "%s failed with errno %d", msg, 99 errno); 100 else 101 ATF_CHECK_EQ_MSG(error, errno, 102 "%s failed with wrong errno %d (expected %d)", msg, 103 errno, error); 104 } else { 105 ATF_CHECK_MSG(error == 0, "%s succeeded", msg); 106 munmap(p, getpagesize()); 107 } 108 } 109 110 ATF_TC_WITHOUT_HEAD(mmap__bad_arguments); 111 ATF_TC_BODY(mmap__bad_arguments, tc) 112 { 113 int fd; 114 115 ATF_REQUIRE((fd = shm_open(SHM_ANON, O_RDWR, 0644)) >= 0); 116 ATF_REQUIRE(ftruncate(fd, getpagesize()) == 0); 117 118 /* These should work. */ 119 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON, -1, 0, 120 "simple MAP_ANON"); 121 checked_mmap(PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0, 122 "simple shm fd shared"); 123 checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0, 124 "simple shm fd private"); 125 126 /* Extra PROT flags. */ 127 checked_mmap(PROT_READ | PROT_WRITE | 0x100000, MAP_ANON, -1, EINVAL, 128 "MAP_ANON with extra PROT flags"); 129 checked_mmap(0xffff, MAP_SHARED, fd, EINVAL, 130 "shm fd with garbage PROT"); 131 132 /* Undefined flag. */ 133 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_RESERVED0080, -1, 134 EINVAL, "Undefined flag"); 135 136 /* Both MAP_SHARED and MAP_PRIVATE */ 137 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE | 138 MAP_SHARED, -1, EINVAL, "MAP_ANON with both SHARED and PRIVATE"); 139 checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_SHARED, fd, 140 EINVAL, "shm fd with both SHARED and PRIVATE"); 141 142 /* At least one of MAP_SHARED or MAP_PRIVATE without ANON */ 143 checked_mmap(PROT_READ | PROT_WRITE, 0, fd, EINVAL, 144 "shm fd without sharing flag"); 145 146 /* MAP_ANON with either sharing flag (impacts fork). */ 147 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0, 148 "shared MAP_ANON"); 149 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0, 150 "private MAP_ANON"); 151 152 /* MAP_ANON should require an fd of -1. */ 153 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, 0, EINVAL, 154 "MAP_ANON with fd != -1"); 155 } 156 157 ATF_TP_ADD_TCS(tp) 158 { 159 160 ATF_TP_ADD_TC(tp, mmap__map_at_zero); 161 ATF_TP_ADD_TC(tp, mmap__bad_arguments); 162 163 return (atf_no_error()); 164 } 165