1#!/bin/sh 2 3# 4# Copyright (c) 2014 EMC Corp. 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# Test scenario by kib@ 30 31[ `uname -m` = "i386" ] || exit 0 32 33. ../default.cfg 34 35grep -q MAP_GUARD /usr/include/sys/mman.h 2>/dev/null || exit 0 36here=`pwd` 37cd /tmp 38sed '1,/^EOF/d' < $here/$0 > mmap16.c 39mycc -o mmap16 -Wall -Wextra -O2 -g mmap16.c -lpthread || exit 1 40rm -f mmap16.c /tmp/mmap16.core 41 42echo "Expect: 43 mmap16: mprotect: Permission denied" 44/tmp/mmap16 > /dev/null 45s=$? 46 47rm -f /tmp/mmap16 /tmp/mmap16.core 48exit $s 49EOF 50/* $Id: map_hole.c,v 1.6 2014/06/16 05:52:03 kostik Exp kostik $ */ 51 52#include <sys/types.h> 53#include <sys/mman.h> 54#include <sys/resource.h> 55 56#include <err.h> 57#include <errno.h> 58#include <signal.h> 59#include <stdio.h> 60#include <stdlib.h> 61#include <string.h> 62#include <ucontext.h> 63#include <unistd.h> 64 65static void 66sighandler(int signo, siginfo_t *info, void *uap1) 67{ 68 static char scratch; 69 ucontext_t *uap; 70 71 uap = uap1; 72 printf("SIG%s(%d) at %p (%%eax %p)\n", 73 signo < sys_nsig ? sys_signame[signo] : "SOME", signo, 74 info->si_addr, (void *)(uintptr_t)uap->uc_mcontext.mc_eax); 75 uap->uc_mcontext.mc_eax = (uintptr_t)&scratch; 76} 77 78static void 79access_addr(char *addr) 80{ 81 char r; 82 83 r = '1'; 84 printf("accessing %p\n", addr); 85 __asm __volatile("movb %0,(%%eax)" : : "i"(r), "a"(addr) : "memory"); 86 printf("done\n"); 87} 88 89static int pagesz; 90 91static void 92test_access(char *addr) 93{ 94 struct rusage ru; 95 long majflt, minflt; 96 97 if (getrusage(RUSAGE_THREAD, &ru) == -1) 98 err(1, "getrusage"); 99 majflt = ru.ru_majflt; 100 minflt = ru.ru_minflt; 101 access_addr(addr); 102 if (mprotect(addr, pagesz, PROT_READ | PROT_WRITE) == -1) 103 warn("mprotect"); 104 access_addr(addr); 105 if (getrusage(RUSAGE_THREAD, &ru) == -1) 106 err(1, "getrusage"); 107 majflt = ru.ru_majflt - majflt; 108 minflt = ru.ru_minflt - minflt; 109 printf("majflt %ld minflt %ld\n", majflt, minflt); 110} 111 112int 113main(void) 114{ 115 struct sigaction sa; 116 char *addr; 117 char cmd[128]; 118 119 bzero(&sa, sizeof(sa)); 120 sa.sa_sigaction = sighandler; 121 sa.sa_flags = SA_SIGINFO; 122 if (sigaction(SIGSEGV, &sa, NULL) == -1) 123 err(1, "sigaction"); 124 pagesz = getpagesize(); 125 126 printf("MAP_GUARD\n"); 127 addr = mmap(NULL, pagesz, PROT_NONE, MAP_GUARD, -1, 0); 128 if (addr == (char *)MAP_FAILED) 129 err(1, "FAIL: mmap(MAP_GUARD)"); 130 test_access(addr); 131 132 printf("PROT_NONE wire\n"); 133 addr = mmap(NULL, pagesz, PROT_NONE, MAP_ANON, -1, 0); 134 if (addr == (char *)MAP_FAILED) 135 err(1, "mmap(PROT_NONE)"); 136 if (mlock(addr, pagesz) == -1) 137 if (errno != ENOMEM) 138 err(1, "mlock"); 139 test_access(addr); 140 141 snprintf(cmd, sizeof(cmd), "procstat -v %d", getpid()); 142 system(cmd); 143 144 return (0); 145} 146