1336809Sdim/*- 2336809Sdim * Copyright (c) 2009 Simon L. Nielsen <simon@FreeBSD.org>, 3353358Sdim * Bjoern A. Zeeb <bz@FreeBSD.org> 4353358Sdim * 5353358Sdim * Redistribution and use in source and binary forms, with or without 6336809Sdim * modification, are permitted provided that the following conditions 7336809Sdim * are met: 8336809Sdim * 1. Redistributions of source code must retain the above copyright 9336809Sdim * notice, this list of conditions and the following disclaimer. 10336809Sdim * 2. Redistributions in binary form must reproduce the above copyright 11336809Sdim * notice, this list of conditions and the following disclaimer in the 12336809Sdim * documentation and/or other materials provided with the distribution. 13336809Sdim * 14336809Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15336809Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16344779Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17336809Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18344779Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19336809Sdim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20353358Sdim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21344779Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22344779Sdim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23336809Sdim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24344779Sdim * SUCH DAMAGE. 25336809Sdim * 26344779Sdim * $FreeBSD$ 27336809Sdim */ 28336809Sdim 29344779Sdim#include <sys/param.h> 30344779Sdim#include <sys/mman.h> 31337149Sdim#include <sys/sysctl.h> 32336809Sdim#include <sys/types.h> 33336809Sdim 34336809Sdim#include <stdio.h> 35336809Sdim#include <err.h> 36336809Sdim 37344779Sdimconst struct tests { 38344779Sdim void *addr; 39344779Sdim int ok[2]; /* Depending on security.bsd.map_at_zero {0, !=0}. */ 40336809Sdim} tests[] = { 41336809Sdim { (void *)0, { 0, 1 } }, /* Test sysctl. */ 42344779Sdim { (void *)1, { 0, 0 } }, 43344779Sdim { (void *)(PAGE_SIZE - 1), { 0, 0 } }, 44336809Sdim { (void *)PAGE_SIZE, { 1, 1 } }, 45337149Sdim { (void *)-1, { 0, 0 } }, 46337149Sdim { (void *)(-PAGE_SIZE), { 0, 0 } }, 47337149Sdim { (void *)(-1 - PAGE_SIZE), { 0, 0 } }, 48337149Sdim { (void *)(-1 - PAGE_SIZE - 1), { 0, 0 } }, 49336809Sdim { (void *)(0x1000 * PAGE_SIZE), { 1, 1 } }, 50336809Sdim}; 51337149Sdim 52336809Sdimint 53336809Sdimmain(void) 54336809Sdim{ 55336809Sdim void *p; 56336809Sdim size_t len; 57336809Sdim int i, error, mib[3], map_at_zero; 58336809Sdim 59336809Sdim error = 0; 60336809Sdim 61353358Sdim /* Get the current sysctl value of security.bsd.map_at_zero. */ 62353358Sdim len = sizeof(mib) / sizeof(*mib); 63353358Sdim if (sysctlnametomib("security.bsd.map_at_zero", mib, &len) == -1) 64336809Sdim err(1, "sysctlnametomib(security.bsd.map_at_zero)"); 65336809Sdim 66336809Sdim len = sizeof(map_at_zero); 67336809Sdim if (sysctl(mib, 3, &map_at_zero, &len, NULL, 0) == -1) 68336809Sdim err(1, "sysctl(security.bsd.map_at_zero)"); 69353358Sdim 70353358Sdim /* Normalize to 0 or 1 for array access. */ 71353358Sdim map_at_zero = !!map_at_zero; 72353358Sdim 73336809Sdim for (i=0; i < (sizeof(tests) / sizeof(*tests)); i++) { 74336809Sdim p = mmap((void *)tests[i].addr, PAGE_SIZE, 75336809Sdim PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_FIXED, 76336809Sdim -1, 0); 77336809Sdim if (p == MAP_FAILED) { 78336809Sdim if (tests[i].ok[map_at_zero] != 0) 79336809Sdim error++; 80336809Sdim warnx("%s: mmap(%p, ...) failed.", 81336809Sdim (tests[i].ok[map_at_zero] == 0) ? "OK " : "ERR", 82353358Sdim tests[i].addr); 83353358Sdim } else { 84353358Sdim if (tests[i].ok[map_at_zero] != 1) 85353358Sdim error++; 86336809Sdim warnx("%s: mmap(%p, ...) succeeded: p=%p", 87336809Sdim (tests[i].ok[map_at_zero] == 1) ? "OK " : "ERR", 88336809Sdim tests[i].addr, p); 89336809Sdim } 90336809Sdim } 91336809Sdim 92336809Sdim if (error) 93336809Sdim err(1, "---\nERROR: %d unexpected results.", error); 94336809Sdim 95336809Sdim return (error != 0); 96336809Sdim} 97336809Sdim