1#!/bin/sh 2 3# 4# Copyright (c) 2008 Peter Holm <pho@FreeBSD.org> 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# Stress test UFS2 file systems by introducing single bit errors in the FS 30# fsck should fix the FS no matter how damaged, but e.g. this panic has been seen: 31# 32# panic(c0912b65,dfe96000,0,c09e4060,ef48c778,...) at panic+0x14b 33# vm_fault(c1868000,dfe96000,1,0) at vm_fault+0x1e0 34# trap_pfault(ef48c894,0,dfe96000) at trap_pfault+0x137 35# trap(dfe90008,ef480028,c0690028,d0560000,dfe96000,...) at trap+0x341 36# calltrap() at calltrap+0x5 37# --- trap 0xc, eip = 0xc08785a6, esp = 0xef48c8d4, ebp = 0xef48c958 --- 38# generic_bcopy(c81cd570,d0508000,c5ead600,c87b81c0,0,...) at generic_bcopy+0x1a 39# ffs_mount(d0508000,c5ead600,0,c09b0860,c5ecfc3c,...) at ffs_mount+0xa14 40# vfs_domount(c5ead600,cd8c7280,ccb75080,0,...) at vfs_domount+0x687 41# vfs_donmount(c5ead600,0,ef48cc04) at vfs_donmount+0x2ef 42# kernel_mount(c5660960,0,bfbfec86,0,fffffffe,...) at kernel_mount+0x6d 43# ffs_cmount(c5660960,bfbfde50,0,c5ead600,c09b0860,...) at ffs_cmount+0x5d 44# mount(c5ead600,ef48cd04) at mount+0x156 45# syscall(3b,3b,3b,804abcf,bfbfe8e4,...) at syscall+0x22f 46 47[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 48 49. ../default.cfg 50 51D=$diskimage 52 53tst() { 54 rm -f $D 55 truncate -s 2M $D 56 mdconfig -a -t vnode -f $D -u $mdstart 57 bsdlabel -w md$mdstart auto 58 newfs -b 8192 -f 1024 $newfs_flags /dev/md${mdstart}$part > /dev/null 2>&1 59 mount /dev/md${mdstart}$part $mntpoint 60 cp /etc/passwd /etc/group /etc/hosts $mntpoint 61 cp -r /usr/include/ufs $mntpoint 62 umount $mntpoint 63 64 for i in `jot 50`; do 65 ./fuzz -n 50 $D 66 if fsck -f -y /dev/md${mdstart}$part 2>&1 | egrep "^[A-Z]" > /dev/null; then 67 if fsck -f -y /dev/md${mdstart}$part 2>&1 | egrep "^[A-Z]" > /dev/null; then 68 if fsck -f -y /dev/md${mdstart}$part 2>&1 | egrep "^[A-Z]" > /dev/null; then 69 echo "fsck is giving up in loop $i!" 70 break 71 fi 72 fi 73 fi 74 sync;sync;sync 75 if mount /dev/md${mdstart}$part $mntpoint; then 76 ls -l $mntpoint > /dev/null 77 find $mntpoint -exec dd if={} of=/dev/null bs=1m count=3 \; > /dev/null 2>&1 78 umount $mntpoint 79 else 80 echo "Giving up at loop $i" 81 break 82 fi 83 done 84 mdconfig -d -u $mdstart 85 rm -f $D 86} 87 88odir=`pwd` 89dir=/tmp 90 91cd $dir 92sed '1,/^EOF/d' < $odir/$0 > $dir/fuzz.c 93mycc -o fuzz -Wall fuzz.c 94rm -f fuzz.c 95 96for j in `jot 10`; do 97 date '+%T' 98 tst 99done 100rm -f fuzz 101 102exit 103 104EOF 105#include <sys/stat.h> 106 107#include <err.h> 108#include <fcntl.h> 109#include <stdio.h> 110#include <stdlib.h> 111#include <unistd.h> 112 113static void 114usage(void) 115{ 116 fprintf(stderr, "%s {-n <num|-v} <file>\n", getprogname()); 117 exit(1); 118} 119 120static long 121random_long(long mi, long ma) 122{ 123 return (arc4random() % (ma - mi + 1) + mi); 124} 125 126int 127main(int argc, char **argv) 128{ 129 long pos; 130 int ch, fd, i, times = 1, verbose = 0; 131 unsigned char bit, buf, mask, old; 132 struct stat sb; 133 134 while ((ch = getopt(argc, argv, "n:v")) != -1) { 135 switch(ch) { 136 case 'n': /* Bits to alter */ 137 if (sscanf(optarg, "%d", ×) != 1) 138 usage(); 139 break; 140 case 'v': /* verbose flag */ 141 verbose += 1; 142 break; 143 default: 144 usage(); 145 } 146 } 147 argc -= optind; 148 argv += optind; 149 150 if (argc == 0) 151 usage(); 152 153 if ((fd = open(argv[0], O_RDWR)) == -1) 154 err(1, "open(%s)", argv[0]); 155 if (fstat(fd, &sb) == -1) 156 err(1, "stat(%s)", argv[0]); 157 158 for (i = 0; i < times; i++) { 159 pos = random_long(0, sb.st_size - 1); 160 if (lseek(fd, pos, SEEK_SET) == -1) 161 err(1, "fseek(%d, %ld)", fd, pos); 162 if (read(fd, &buf, 1) != 1) 163 err(1, "read(%d)", fd); 164 bit = random_long(0,7); 165 mask = ~(1 << bit); 166 old = buf; 167 buf = (buf & mask) | (~buf & ~mask); 168 if (verbose > 0) 169 printf("Change %2x to %2x at %4ld " 170 "by flipping bit %d\n", 171 old, buf, pos, bit); 172 if (lseek(fd, pos, SEEK_SET) == -1) 173 err(1, "fseek(%d, %ld)", fd, pos); 174 if (write(fd, &buf, 1) != 1) 175 err(1, "write(%d)", fd); 176 } 177 close(fd); 178 179 return (0); 180} 181