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Makefile.inc
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stack_protector.c
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stack_protector_compat.c
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Editing: stack_protector.c
/* $NetBSD: stack_protector.c,v 1.4 2006/11/22 17:23:25 christos Exp $ */ /* $OpenBSD: stack_protector.c,v 1.10 2006/03/31 05:34:44 deraadt Exp $ */ /* * Copyright (c) 2002 Hiroaki Etoh, Federico G. Schwindt, and Miodrag Vallat. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/sysctl.h> #include <errno.h> #include <link.h> #include <signal.h> #include <string.h> #include <syslog.h> #include <unistd.h> #include "libc_private.h" /* * We give __guard_setup a defined priority early on so that statically linked * applications have a defined priority at which __stack_chk_guard will be * getting initialized. This will not matter to most applications, because * they're either not usually statically linked or they simply don't do things * in constructors that would be adversely affected by their positioning with * respect to this initialization. * * This conditional should be removed when GCC 4.2 is removed. */ #if __has_attribute(__constructor__) || __GNUC_PREREQ__(4, 3) #define _GUARD_SETUP_CTOR_ATTR \ __attribute__((__constructor__ (200), __used__)); #else #define _GUARD_SETUP_CTOR_ATTR \ __attribute__((__constructor__, __used__)); #endif extern long __stack_chk_guard[8]; extern int __sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen); long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; static void __guard_setup(void) _GUARD_SETUP_CTOR_ATTR; static void __fail(const char *); void __stack_chk_fail(void); void __chk_fail(void); /*LINTED used*/ static void __guard_setup(void) { static const int mib[2] = { CTL_KERN, KERN_ARND }; volatile long tmp_stack_chk_guard[nitems(__stack_chk_guard)]; size_t idx, len; int error; if (__stack_chk_guard[0] != 0) return; /* * Avoid using functions which might have stack protection * enabled, to update the __stack_chk_guard. First fetch the * data into a temporal array, then do manual volatile copy to * not allow optimizer to call memcpy() behind us. */ error = _elf_aux_info(AT_CANARY, __DEQUALIFY(void *, tmp_stack_chk_guard), sizeof(tmp_stack_chk_guard)); if (error == 0 && tmp_stack_chk_guard[0] != 0) { for (idx = 0; idx < nitems(__stack_chk_guard); idx++) { __stack_chk_guard[idx] = tmp_stack_chk_guard[idx]; tmp_stack_chk_guard[idx] = 0; } return; } len = sizeof(__stack_chk_guard); if (__sysctl(mib, nitems(mib), __stack_chk_guard, &len, NULL, 0) == -1 || len != sizeof(__stack_chk_guard)) { /* If sysctl was unsuccessful, use the "terminator canary". */ ((unsigned char *)(void *)__stack_chk_guard)[0] = 0; ((unsigned char *)(void *)__stack_chk_guard)[1] = 0; ((unsigned char *)(void *)__stack_chk_guard)[2] = '\n'; ((unsigned char *)(void *)__stack_chk_guard)[3] = 255; } } /*ARGSUSED*/ static void __fail(const char *msg) { struct sigaction sa; sigset_t mask; /* Immediately block all signal handlers from running code */ (void)sigfillset(&mask); (void)sigdelset(&mask, SIGABRT); (void)sigprocmask(SIG_BLOCK, &mask, NULL); /* This may fail on a chroot jail... */ syslog(LOG_CRIT, "%s", msg); (void)memset(&sa, 0, sizeof(sa)); (void)sigemptyset(&sa.sa_mask); sa.sa_flags = 0; sa.sa_handler = SIG_DFL; (void)sigaction(SIGABRT, &sa, NULL); (void)kill(getpid(), SIGABRT); _exit(127); } void __stack_chk_fail(void) { __fail("stack overflow detected; terminated"); } void __chk_fail(void) { __fail("buffer overflow detected; terminated"); } #ifndef PIC __weak_reference(__stack_chk_fail, __stack_chk_fail_local); #endif
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