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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/* Copyright (C) 2016 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*
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* Page util functions
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*/
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#include "suricata-common.h"
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#include "util-pages.h"
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#ifndef HAVE_PAGESUPPORTSRWX_AS_MACRO
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/** \brief check if OS allows for RWX pages
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*
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* Some OS' disallow RWX pages for security reasons. This function mmaps
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* some memory RW and then tries to turn it into RWX. If this fails we
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* assume that the OS doesn't allow for this.
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*
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* Thanks to Shawn Webb from HardenedBSD for the suggestion.
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*
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* \retval 1 RWX supported
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* \retval 0 not supported
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*/
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int PageSupportsRWX(void)
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{
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int retval = 1;
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void *ptr;
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ptr = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED, -1, 0);
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if (ptr != MAP_FAILED) {
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if (mprotect(ptr, getpagesize(), PROT_READ|PROT_WRITE|PROT_EXEC) == -1) {
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SCLogConfig("RWX pages denied by OS");
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retval = 0;
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}
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munmap(ptr, getpagesize());
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}
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return retval;
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}
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#endif /* HAVE_PAGESUPPORTSRWX_AS_MACRO */
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