f499cd524a
This adds bounds checking for the following functions:
memset, fgets, gets, memcpy, memmove, memset, snprintf, sprintf, strcat,
strcpy, strncat, strncpy, vsnprintf, vsprintf
This functionality is enabled by compiling with:
gcc -I/usr/include/ssp -D_FORTIFY_SOURCE=<1|2> -lssp
Eventually gcc will provide -ffortify-source or something to automate this
[we hope :-)]
62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
/* $NetBSD: snprintf_chk.c,v 1.1 2006/11/08 19:52:11 christos Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: snprintf_chk.c,v 1.1 2006/11/08 19:52:11 christos Exp $");
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#include <ssp.h>
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#include <stdio.h>
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#include <stdarg.h>
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/*ARGSUSED*/
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int
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__snprintf_chk(char * __restrict buf, size_t len, int flags, size_t slen,
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const char * __restrict fmt, ...)
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{
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va_list ap;
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int rv;
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if (len > slen)
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__chk_fail();
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va_start(ap, fmt);
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rv = vsnprintf(buf, len, fmt, ap);
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va_end(ap);
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return rv;
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}
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