util.c revision 1.30
1/* $OpenBSD: util.c,v 1.30 2014/06/05 08:39:07 otto Exp $ */ 2 3/* 4 * Copyright (c) 1998 Per Fogelstrom, Opsycon AB 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29#include <sys/types.h> 30#include <sys/param.h> 31#include <sys/sysctl.h> 32#include <string.h> 33#include "archdep.h" 34 35/* 36 * Stack protector dummies. 37 * Ideally, a scheme to compile these stubs from libc should be used, but 38 * this would end up dragging too much code from libc here. 39 */ 40long __guard_local __dso_hidden __attribute__((section(".openbsd.randomdata"))); 41 42void __stack_smash_handler(char [], int); 43 44void 45__stack_smash_handler(char func[], int damaged) 46{ 47 _dl_exit(127); 48} 49 50char * 51_dl_strdup(const char *orig) 52{ 53 char *newstr; 54 int len; 55 56 len = _dl_strlen(orig)+1; 57 newstr = _dl_malloc(len); 58 _dl_strlcpy(newstr, orig, len); 59 return (newstr); 60} 61 62void 63_dl_randombuf(void *buf, size_t buflen) 64{ 65 const int mib[2] = { CTL_KERN, KERN_ARND }; 66 _dl_sysctl(mib, 2, buf, &buflen, NULL, 0); 67} 68 69u_int32_t 70_dl_random(void) 71{ 72 u_int32_t rnd; 73 _dl_randombuf(&rnd, sizeof(rnd)); 74 return (rnd); 75} 76