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 36 static const struct { 37 void *addr; 38 int ok[2]; /* Depending on security.bsd.map_at_zero {0, !=0}. */ 39 } map_at_zero_tests[] = { 40 { (void *)0, { 0, 1 } }, /* Test sysctl. */ 41 { (void *)1, { 0, 0 } }, 42 { (void *)(PAGE_SIZE - 1), { 0, 0 } }, 43 { (void *)PAGE_SIZE, { 1, 1 } }, 44 { (void *)-1, { 0, 0 } }, 45 { (void *)(-PAGE_SIZE), { 0, 0 } }, 46 { (void *)(-1 - PAGE_SIZE), { 0, 0 } }, 47 { (void *)(-1 - PAGE_SIZE - 1), { 0, 0 } }, 48 { (void *)(0x1000 * PAGE_SIZE), { 1, 1 } }, 49 }; 50 51 #define MAP_AT_ZERO "security.bsd.map_at_zero" 52 53 ATF_TC_WITHOUT_HEAD(mmap__map_at_zero); 54 ATF_TC_BODY(mmap__map_at_zero, tc) 55 { 56 void *p; 57 size_t len; 58 unsigned int i; 59 int map_at_zero; 60 61 len = sizeof(map_at_zero); 62 if (sysctlbyname(MAP_AT_ZERO, &map_at_zero, &len, NULL, 0) == -1) { 63 atf_tc_skip("sysctl for %s failed: %s\n", MAP_AT_ZERO, 64 strerror(errno)); 65 return; 66 } 67 68 /* Normalize to 0 or 1 for array access. */ 69 map_at_zero = !!map_at_zero; 70 71 for (i = 0; i < nitems(map_at_zero_tests); i++) { 72 p = mmap((void *)map_at_zero_tests[i].addr, PAGE_SIZE, 73 PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_FIXED, 74 -1, 0); 75 if (p == MAP_FAILED) { 76 ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 0, 77 "mmap(%p, ...) failed", map_at_zero_tests[i].addr); 78 } else { 79 ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 1, 80 "mmap(%p, ...) succeeded: p=%p\n", 81 map_at_zero_tests[i].addr, p); 82 } 83 } 84 } 85 86 ATF_TP_ADD_TCS(tp) 87 { 88 89 ATF_TP_ADD_TC(tp, mmap__map_at_zero); 90 91 return (atf_no_error()); 92 } 93