1*8a272653SPeter Holm#!/bin/sh 2*8a272653SPeter Holm 3*8a272653SPeter Holm# 4*8a272653SPeter Holm# Copyright (c) 2017 Dell EMC Isilon 5*8a272653SPeter Holm# All rights reserved. 6*8a272653SPeter Holm# 7*8a272653SPeter Holm# Redistribution and use in source and binary forms, with or without 8*8a272653SPeter Holm# modification, are permitted provided that the following conditions 9*8a272653SPeter Holm# are met: 10*8a272653SPeter Holm# 1. Redistributions of source code must retain the above copyright 11*8a272653SPeter Holm# notice, this list of conditions and the following disclaimer. 12*8a272653SPeter Holm# 2. Redistributions in binary form must reproduce the above copyright 13*8a272653SPeter Holm# notice, this list of conditions and the following disclaimer in the 14*8a272653SPeter Holm# documentation and/or other materials provided with the distribution. 15*8a272653SPeter Holm# 16*8a272653SPeter Holm# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17*8a272653SPeter Holm# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18*8a272653SPeter Holm# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19*8a272653SPeter Holm# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20*8a272653SPeter Holm# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21*8a272653SPeter Holm# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22*8a272653SPeter Holm# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23*8a272653SPeter Holm# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24*8a272653SPeter Holm# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25*8a272653SPeter Holm# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26*8a272653SPeter Holm# SUCH DAMAGE. 27*8a272653SPeter Holm# 28*8a272653SPeter Holm 29*8a272653SPeter Holm# r320344: allow mprotect(2) over the guards to succeed regardless of 30*8a272653SPeter Holm# the requested protection. 31*8a272653SPeter Holm 32*8a272653SPeter Holm. ../default.cfg 33*8a272653SPeter Holm 34*8a272653SPeter Holmgrep -q MAP_GUARD /usr/include/sys/mman.h 2>/dev/null || exit 0 35*8a272653SPeter Holmhere=`pwd` 36*8a272653SPeter Holmcd /tmp 37*8a272653SPeter Holmsed '1,/^EOF/d' < $here/$0 > mmap30.c 38*8a272653SPeter Holmmycc -o mmap30 -Wall -Wextra -O2 -g mmap30.c || exit 1 39*8a272653SPeter Holmrm -f mmap30.c /tmp/mmap30.core 40*8a272653SPeter Holm 41*8a272653SPeter Holm/tmp/mmap30 > /dev/null 42*8a272653SPeter Holms=$? 43*8a272653SPeter Holm 44*8a272653SPeter Holmrm -f /tmp/mmap30 /tmp/mmap30.core 45*8a272653SPeter Holmexit $s 46*8a272653SPeter HolmEOF 47*8a272653SPeter Holm#include <sys/types.h> 48*8a272653SPeter Holm#include <sys/mman.h> 49*8a272653SPeter Holm 50*8a272653SPeter Holm#include <err.h> 51*8a272653SPeter Holm#include <errno.h> 52*8a272653SPeter Holm#include <stdio.h> 53*8a272653SPeter Holm#include <stdlib.h> 54*8a272653SPeter Holm#include <unistd.h> 55*8a272653SPeter Holm 56*8a272653SPeter Holmint 57*8a272653SPeter Holmmain(void) 58*8a272653SPeter Holm{ 59*8a272653SPeter Holm int pagesz; 60*8a272653SPeter Holm void *addr; 61*8a272653SPeter Holm 62*8a272653SPeter Holm pagesz = getpagesize(); 63*8a272653SPeter Holm addr = mmap(NULL, pagesz, PROT_NONE, MAP_GUARD, -1, 0); 64*8a272653SPeter Holm if (addr == (char *)MAP_FAILED) 65*8a272653SPeter Holm err(1, "FAIL: mmap(MAP_GUARD)"); 66*8a272653SPeter Holm 67*8a272653SPeter Holm if (mprotect(addr, pagesz, PROT_READ | PROT_WRITE) == -1) 68*8a272653SPeter Holm err(1, "mprotect(RW)"); 69*8a272653SPeter Holm 70*8a272653SPeter Holm if (mprotect(addr, pagesz, PROT_NONE) == -1) 71*8a272653SPeter Holm err(1, "mprotect(RW)"); 72*8a272653SPeter Holm 73*8a272653SPeter Holm if (munmap(addr, pagesz) == -1) 74*8a272653SPeter Holm err(1, "munmap"); 75*8a272653SPeter Holm 76*8a272653SPeter Holm return (0); 77*8a272653SPeter Holm} 78