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File: [cvs.NetBSD.org] / src / lib / libc / misc / stack_protector.c (download)

Revision 1.2.4.1, Mon Feb 2 22:07:40 2009 UTC (11 years, 6 months ago) by snj
Branch: netbsd-5
CVS Tags: netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2, netbsd-5-1-RELEASE, netbsd-5-1-RC4, netbsd-5-1-RC3, netbsd-5-1-RC2, netbsd-5-1-RC1, netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE, netbsd-5-1-2-RELEASE, netbsd-5-1-1-RELEASE, netbsd-5-1, netbsd-5-0-RELEASE, netbsd-5-0-RC4, netbsd-5-0-RC3, netbsd-5-0-RC2, netbsd-5-0-2-RELEASE, netbsd-5-0-1-RELEASE, netbsd-5-0, matt-nb5-pq3-base, matt-nb5-pq3, matt-nb5-mips64-u2-k2-k4-k7-k8-k9, matt-nb5-mips64-u1-k1-k5, matt-nb5-mips64-premerge-20101231, matt-nb5-mips64-premerge-20091211, matt-nb5-mips64-k15, matt-nb5-mips64, matt-nb4-mips64-k7-u2a-k9b
Changes since 1.2: +3 -3 lines

Pull up following revision(s) (requested by ad in ticket #399):
	lib/libc/misc/stack_protector.c: revision 1.3
	lib/libc/stdlib/abort.c: revision 1.13
	lib/libc/thread-stub/thread-stub.c: revision 1.21
Make threaded programs die correctly:
kill(getpid(), SIGFOO) -> raise(SIGFOO)

/*	$NetBSD: stack_protector.c,v 1.2.4.1 2009/02/02 22:07:40 snj 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>
__RCSID("$NetBSD: stack_protector.c,v 1.2.4.1 2009/02/02 22:07:40 snj Exp $");

#ifdef _LIBC
#include "namespace.h"
#endif
#include <sys/param.h>
#include <sys/sysctl.h>
#include <ssp/ssp.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#ifdef _LIBC
#include <syslog.h>
#include "extern.h"
#else
#define __sysctl sysctl
void xprintf(const char *fmt, ...);
#include <stdlib.h>
#endif

long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0};
static void __fail(const char *);
void __stack_chk_fail(void);
void __chk_fail(void);
void __stack_chk_fail_local(void);
void __guard_setup(void);

void
__guard_setup(void)
{
	int mib[2];
	size_t len;

	if (__stack_chk_guard[0] != 0)
		return;

	mib[0] = CTL_KERN;
	mib[1] = KERN_ARND;

	len = sizeof(__stack_chk_guard);
	if (__sysctl(mib, 2, __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)
{
#ifdef _LIBC
	struct syslog_data sdata = SYSLOG_DATA_INIT;
#endif
	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);

#ifdef _LIBC
	/* This may fail on a chroot jail... */
	syslog_ss(LOG_CRIT, &sdata, msg);
#else
	xprintf("%s: %s\n", getprogname(), msg);
#endif

	(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)raise(SIGABRT);
	_exit(127);
}

void
__stack_chk_fail(void)
{
	__fail("stack overflow detected; terminated");
}

void
__chk_fail(void)
{
	__fail("buffer overflow detected; terminated");
}

void
__stack_chk_fail_local(void)
{
	__stack_chk_fail();
}