Differential D3043 Diff 7405 lib/libc/secure/__gets_chk.c

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lib/libc/secure/__gets_chk.c

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				/* $FreeBSD$ */
				/* $NetBSD: gets_chk.c,v 1.7 2013/10/04 20:49:16 christos Exp $ */

				/*-
				* 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.
				*/

				#undef _FORTIFY_SOURCE

				#include <sys/cdefs.h>
				__RCSID("$NetBSD: gets_chk.c,v 1.7 2013/10/04 20:49:16 christos Exp $");

				/LINTLIBRARY/

				#include <secure/security.h>
				#include <stdio.h>
				#include <string.h>
				#include <limits.h>
				#include <stdlib.h>
				#include "secure/_stdio.h"

				char *
				__gets_chk(char * __restrict buf, size_t bos)
				{
				char *abuf;
				size_t len;

				if (__predict_false(bos == __FORTIFY_UNKNOWN_SIZE))
				return (gets(buf));

				pfgUnsubmitted Not Done Inline Actions this breaks the arm64 build. You can use fgets() instead, however I would prefer toy just remove it all: gets is by all mean deprecated and we already warn to not use it at all. pfg: this breaks the arm64 build. You can use fgets() instead, however I would prefer toy just…
				opAuthorUnsubmitted Not Done Inline Actions Sure, but the warning not supersede the check. op: Sure, but the warning not supersede the check.
				if (__predict_false(bos >= (size_t)INT_MAX))
				return (gets(buf));

				if ((abuf = malloc(bos + 1)) == NULL)
				return (gets(buf));

				if (fgets(abuf, (int)(bos + 1), stdin) == NULL) {
				free(abuf);
				return (NULL);
				}

				len = strlen(abuf);
				if (len > 0 && abuf[len - 1] == '\n')
				--len;

				if (len >= bos)
				__fortify_chk_fail("gets: prevented write past end of buffer");

				(void)memcpy(buf, abuf, len);

				buf[len] = '\0';
				free(abuf);

				return (buf);
				}