freebsd-src/lib/libc/secure/strncpy_chk.c
Kyle Evans 4719366192 libc: move __ssp_overlap back out into <ssp/ssp.h>
We'll be using it in some upcoming definitions in headers, so move it
back now but slap a warning on it.  Our upcoming uses will all be inside
of inline functions, so we're not overly concerned about double
evaluation immediately.

Reviewed by:	markj
Sponsored by:	Klara, Inc.
Sponsored by:	Stormshield
Differential Revision:	https://reviews.freebsd.org/D45677
2024-07-13 00:16:23 -05:00

52 lines
1.9 KiB
C

/*-
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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: strncpy_chk.c,v 1.6 2015/05/09 15:42:21 christos Exp $");
#include <string.h>
#include <ssp/string.h>
#undef strncpy
char *
__strncpy_chk(char * __restrict dst, const char * __restrict src, size_t len,
size_t slen)
{
if (len > slen)
__chk_fail();
if (__ssp_overlap(src, dst, len))
__chk_fail();
return (strncpy(dst, src, len));
}