diff options
Diffstat (limited to 'lib/libc/secure/vsprintf_chk.c')
-rw-r--r-- | lib/libc/secure/vsprintf_chk.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/lib/libc/secure/vsprintf_chk.c b/lib/libc/secure/vsprintf_chk.c new file mode 100644 index 000000000000..6855feb92f15 --- /dev/null +++ b/lib/libc/secure/vsprintf_chk.c @@ -0,0 +1,58 @@ +/*- + * + * 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: vsprintf_chk.c,v 1.6 2009/02/05 05:39:38 lukem Exp $"); + +#include <limits.h> +#include <stdarg.h> +#include <stdio.h> + +#include <ssp/stdio.h> +#undef vsprintf +#undef vsnprintf + +int +__vsprintf_chk(char * __restrict buf, int flags, size_t slen, + const char * __restrict fmt, va_list ap) +{ + int rv; + + if (slen > (size_t)INT_MAX) + rv = vsprintf(buf, fmt, ap); + else { + if ((rv = vsnprintf(buf, slen, fmt, ap)) >= 0 && + (size_t)rv >= slen) + __chk_fail(); + } + + return (rv); +} |