1#!/bin/sh 2 3# 4# Copyright (c) 2015 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# "panic: vm_page_unwire: page 0xc36cce48's wire count is zero" seen. 30# Fixed by r285878. 31 32# Test scenario by kib@: 33# 1. We mapped and mlocked the file. 34# 2. The file is truncated 35# 3. The file is extended again to cover the whole mapped area. 36# 4. The program accesses the mapping past the point of truncation. 37 38. ../default.cfg 39 40dir=/tmp 41odir=`pwd` 42cd $dir 43sed '1,/^EOF/d' < $odir/$0 > $dir/mmap25.c 44mycc -o mmap25 -Wall -Wextra mmap25.c || exit 1 45rm -f mmap25.c 46cd $odir 47 48cp /tmp/mmap25 /tmp/mmap25.inputfile 49daemon sh -c '(cd ../testcases/swap; ./swap -t 1m -i 2)' > \ 50 /dev/null 2>&1 51sleep 1 52 53/tmp/mmap25 /tmp/mmap25.inputfile 54 55while pgrep -q swap; do 56 pkill -9 swap 57done 58rm -f /tmp/mmap25 /tmp/mmap25.inputfile mmap25.core 59exit 60 61EOF 62#include <sys/fcntl.h> 63#include <sys/mman.h> 64#include <sys/param.h> 65#include <sys/stat.h> 66#include <sys/types.h> 67#include <sys/wait.h> 68 69#include <err.h> 70#include <errno.h> 71#include <stdlib.h> 72#include <unistd.h> 73 74const char *file; 75volatile char c; 76 77void 78test(void) 79{ 80 struct stat st; 81 char *p; 82 size_t len; 83 off_t pos; 84 int error, fd; 85 86 if ((fd = open(file, O_RDWR)) == -1) 87 err(1, "open %s", file); 88 if ((error = fstat(fd, &st)) == -1) 89 err(1, "stat(%s)", file); 90 len = round_page(st.st_size); 91 pos = len - getpagesize(); 92 if ((p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) 93 == MAP_FAILED) 94 err(1, "mmap"); 95 if ((error = mlock(p, len)) == -1) 96 err(1, "mlock"); 97 98 if (ftruncate(fd, pos) == -1) 99 err(1, "ftruncate 1"); 100 if (ftruncate(fd, len) == -1) 101 err(1, "ftruncate 2"); 102 103 c = p[pos]; /* Program received signal SIGSEGV, Segmentation fault. */ 104 105 if (munmap(p, len) == -1) 106 err(1, "unmap()"); 107 close(fd); 108} 109 110int 111main(int argc, char *argv[]) 112{ 113 if (argc != 2) 114 errx(1, "Usage: %s <file>", argv[0]); 115 file = argv[1]; 116 117 test(); 118 119 return (0); 120} 121