test/stress/stress2/misc/fuzz.sh

   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 # $FreeBSD$
  29 #
  30
  31 # Stress test UFS2 file systems by introducing single bit errors in the FS
  32 # fsck fould fix the FS no matter how damaged, but f.x. this panic has been seen:
  33 #
  34 # panic(c0912b65,dfe96000,0,c09e4060,ef48c778,...) at panic+0x14b
  35 # vm_fault(c1868000,dfe96000,1,0) at vm_fault+0x1e0
  36 # trap_pfault(ef48c894,0,dfe96000) at trap_pfault+0x137
  37 # trap(dfe90008,ef480028,c0690028,d0560000,dfe96000,...) at trap+0x341
  38 # calltrap() at calltrap+0x5
  39 # --- trap 0xc, eip = 0xc08785a6, esp = 0xef48c8d4, ebp = 0xef48c958 ---
  40 # generic_bcopy(c81cd570,d0508000,c5ead600,c87b81c0,0,...) at generic_bcopy+0x1a
  41 # ffs_mount(d0508000,c5ead600,0,c09b0860,c5ecfc3c,...) at ffs_mount+0xa14
  42 # vfs_domount(c5ead600,cd8c7280,ccb75080,0,...) at vfs_domount+0x687
  43 # vfs_donmount(c5ead600,0,ef48cc04) at vfs_donmount+0x2ef
  44 # kernel_mount(c5660960,0,bfbfec86,0,fffffffe,...) at kernel_mount+0x6d
  45 # ffs_cmount(c5660960,bfbfde50,0,c5ead600,c09b0860,...) at ffs_cmount+0x5d
  46 # mount(c5ead600,ef48cd04) at mount+0x156
  47 # syscall(3b,3b,3b,804abcf,bfbfe8e4,...) at syscall+0x22f
  48
  49
  50 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
  51
  52 . ../default.cfg
  53
  54 D=$diskimage
  55
  56 tst() {
  57    rm -f $D
  58    truncate -s 2M $D
  59    mdconfig -a -t vnode -f $D -u $mdstart
  60    bsdlabel -w md$mdstart auto
  61    newfs -b 8192 -f 1024 -U /dev/md${mdstart}${part} > /dev/null 2>&1
  62    mount /dev/md${mdstart}${part} $mntpoint
  63    cp /etc/passwd /etc/group /etc/hosts $mntpoint
  64    cp -r /usr/include/ufs $mntpoint
  65    umount $mntpoint
  66
  67    for i in `jot 50`; do
  68       ./fuzz -n 50 $D
  69       if fsck -f -y /dev/md${mdstart}${part} 2>&1 | egrep "^[A-Z]" > /dev/null; then
  70          if fsck -f -y /dev/md${mdstart}${part} 2>&1 | egrep "^[A-Z]" > /dev/null; then
  71             if fsck -f -y /dev/md${mdstart}${part} 2>&1 | egrep "^[A-Z]" > /dev/null; then
  72                echo "fsck is giving up in loop $i!"
  73                break
  74             fi
  75          fi
  76       fi
  77       sync;sync;sync
  78       if mount /dev/md${mdstart}${part} $mntpoint; then
  79          ls -l $mntpoint > /dev/null
  80          find $mntpoint  -exec dd if={} of=/dev/null bs=1m count=3 \; > /dev/null 2>&1
  81          umount $mntpoint
  82       else
  83          echo "Giving up at loop $i"
  84          break
  85       fi
  86    done
  87    mdconfig -d -u ${mdstart}
  88    rm -f $D
  89 }
  90
  91 odir=`pwd`
  92 dir=/tmp
  93
  94 cd $dir
  95 sed '1,/^EOF/d' < $odir/$0 > $dir/fuzz.c
  96 cc -o fuzz -Wall fuzz.c
  97 rm -f fuzz.c
  98
  99 for j in `jot 10`; do
 100    date '+%T'
 101    tst
 102 done
 103 rm -f fuzz
 104
 105 exit
 106
 107 EOF
 108 #include <stdio.h>
 109 #include <stdlib.h>
 110 #include <unistd.h>
 111 #include <fcntl.h>
 112 #include <sys/stat.h>
 113 #include <err.h>
 114
 115 void
 116 usage(void)
 117 {
 118         fprintf(stderr, "%s {-n <num|-v} <file>\n", getprogname());
 119         exit(1);
 120 }
 121
 122 long
 123 random_long(long mi, long ma)
 124 {
 125         return (arc4random()  % (ma - mi + 1) + mi);
 126 }
 127
 128 int
 129 main(int argc, char **argv)
 130 {
 131         int ch, fd, i, times = 1, verbose = 0;
 132         long pos;
 133         unsigned char bit, buf, mask, old;
 134         struct stat sb;
 135
 136         while ((ch = getopt(argc, argv, "n:v")) != -1)
 137                 switch(ch) {
 138                 case 'n':       /* Bits to alter */
 139                         if (sscanf(optarg, "%d", &times) != 1)
 140                                 usage();
 141                         break;
 142                 case 'v':       /* verbose flag */
 143                         verbose += 1;
 144                         break;
 145                 default:
 146                         usage();
 147                 }
 148         argc -= optind;
 149         argv += optind;
 150
 151         if (argc == 0)
 152                 usage();
 153
 154
 155         if ((fd = open(argv[0], O_RDWR)) == -1)
 156                 err(1, "open(%s)", argv[0]);
 157         if (fstat(fd, &sb) == -1)
 158                 err(1, "stat(%s)", argv[0]);
 159
 160         for (i = 0; i < times; i++) {
 161                 pos = random_long(0, sb.st_size - 1);
 162                 if (lseek(fd, pos, SEEK_SET) == -1)
 163                         err(1, "fseek(%d, %ld)", fd, pos);
 164                 if (read(fd, &buf, 1) != 1)
 165                         err(1, "read(%d)", fd);
 166                 bit = random_long(0,7);
 167                 mask = ~(1 << bit);
 168                 old = buf;
 169                 buf = (buf & mask) | (~buf & ~mask);
 170                 if (verbose > 0)
 171                         printf("Change %2x to %2x at %4ld by flipping bit %d\n",
 172                                         old, buf, pos, bit);
 173                 if (lseek(fd, pos, SEEK_SET) == -1)
 174                         err(1, "fseek(%d, %ld)", fd, pos);
 175                 if (write(fd, &buf, 1) != 1)
 176                         err(1, "write(%d)", fd);
 177         }
 178         close(fd);
 179         return (0);
 180 }