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e835e3c132
Using the weak symbol explicit_bzero_hook does not work if LTO is enabled. Instead avoid memset optimizations using an asm memory barrier. Use a fallback implementation where the memory is zeroed through volatile.
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 7 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2017 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include "php.h"
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#ifndef HAVE_EXPLICIT_BZERO
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/* $OpenBSD: explicit_bzero.c,v 1.4 2015/08/31 02:53:57 guenther Exp $ */
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/*
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* Public domain.
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* Written by Matthew Dempsky.
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*/
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#include <string.h>
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PHPAPI void php_explicit_bzero(void *dst, size_t siz)
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{
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#ifdef __GNUC__
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memset(dst, 0, siz);
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asm __volatile__("" :: "r"(dst) : "memory");
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#else
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size_t i = 0;
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volatile unsigned char *buf = (volatile unsigned char *)dst;
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for (; i < siz; i ++)
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buf[i] = 0;
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#endif
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}
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#endif
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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