1#!/bin/sh 2 3# 4# Copyright (c) 2017 Dell EMC Isilon 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29# r320344: allow mprotect(2) over the guards to succeed regardless of 30# the requested protection. 31 32. ../default.cfg 33 34grep -q MAP_GUARD /usr/include/sys/mman.h 2>/dev/null || exit 0 35here=`pwd` 36cd /tmp 37sed '1,/^EOF/d' < $here/$0 > mmap30.c 38mycc -o mmap30 -Wall -Wextra -O2 -g mmap30.c || exit 1 39rm -f mmap30.c /tmp/mmap30.core 40 41/tmp/mmap30 > /dev/null 42s=$? 43 44rm -f /tmp/mmap30 /tmp/mmap30.core 45exit $s 46EOF 47#include <sys/types.h> 48#include <sys/mman.h> 49 50#include <err.h> 51#include <errno.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <unistd.h> 55 56int 57main(void) 58{ 59 int pagesz; 60 void *addr; 61 62 pagesz = getpagesize(); 63 addr = mmap(NULL, pagesz, PROT_NONE, MAP_GUARD, -1, 0); 64 if (addr == (char *)MAP_FAILED) 65 err(1, "FAIL: mmap(MAP_GUARD)"); 66 67 if (mprotect(addr, pagesz, PROT_READ | PROT_WRITE) == -1) 68 err(1, "mprotect(RW)"); 69 70 if (mprotect(addr, pagesz, PROT_NONE) == -1) 71 err(1, "mprotect(RW)"); 72 73 if (munmap(addr, pagesz) == -1) 74 err(1, "munmap"); 75 76 return (0); 77} 78