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