[289] in The Cryptographic File System users list
crypto filesystem bugs
daemon@ATHENA.MIT.EDU (Digby Tarvin)
Sat Sep 27 20:44:24 2003
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Date: Sun, 28 Sep 2003 01:35:50 +0100
From: Digby Tarvin <digbyt@acm.org>
To: cfs-users@research.att.com
Cc: Ian Grigg <iang@systemics.com>
Subject: crypto filesystem bugs
Message-ID: <20030928003550.GA26703@skaro.cthulhu.dircon.co.uk>
Reply-To: Digby Tarvin <digbyt@acm.org>
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Recently found an annoying bug in CFS (1.3.1) compiled on Linux (SuSE 7.3)
To see the fault:
1. Create a test directory in a CFS directory tree.
2. Create a bunch of files eg I used
i=1;while [ $i != 200 ]^Jdo^Jtouch $i^Ji=`expr 1 + $i`^Jdone
3. compare the output of 'ls' to 'ls *' eg
digbyt@voyager:/home/digbyt/work/secrets/test> ls
1 11 120 131 142 153 164 175 186 197 28 39 5 60 71 82 93
10 110 121 132 143 154 165 176 187 198 29 4 50 61 72 83 94
100 111 122 133 144 155 166 177 188 199 3 40 51 62 73 84 95
101 112 123 134 145 156 167 178 189 2 30 41 52 63 74 85 96
102 113 124 135 146 157 168 179 19 20 31 42 53 64 75 86 97
103 114 125 136 147 158 169 18 190 21 32 43 54 65 76 87 98
104 115 126 137 148 159 17 180 191 22 33 44 55 66 77 88 99
105 116 127 138 149 16 170 181 192 23 34 45 56 67 78 89
106 117 128 139 15 160 171 182 193 24 35 46 57 68 79 9
107 118 129 14 150 161 172 183 194 25 36 47 58 69 8 90
108 119 13 140 151 162 173 184 195 26 37 48 59 7 80 91
109 12 130 141 152 163 174 185 196 27 38 49 6 70 81 92
digbyt@voyager:/home/digbyt/work/secrets/test> echo *
1 10 11 12 13 14 15 16 17 18 19 2 20 21 22 23 24 25 26 27 28 29 3 30 31 32 33 34 35 36 37 38 39 4 40 41 42 43 44 45 46 47 48 49 5 50 51 52 53 54 55 56 57 58 59 6 60 61 62 63 7 8 9
digbyt@voyager:/home/digbyt/work/secrets> rm -r test
rm: cannot remove directory `test': Input/output error
digbyt@voyager:/home/digbyt/work/secrets> ls test
169 171 173 175 177 179 181 183 185 187 189 191 193 195 197 199
170 172 174 176 178 180 182 184 186 188 190 192 194 196 198
digbyt@voyager:/home/digbyt/work/secrets> rm -r test
digbyt@voyager:/home/digbyt/work/secrets>
For some reason 'ls' seems to see all the files, but the shell does not,
and neither does 'rm -r'.
I had noticed that files seemed to be going missing, but it was only
when I attempted to move the content of a CFS directoy elsewhere that
I noticed that not all files were copied on the first attempt, and
that I ended up with more files that I started with.
It only seems to be a problem with directories that have quite a
few files in them, and all the files are there, but sometimes
not found by reading the directory. Does seem dangerous never the less.
The same version compiled on BSD/OS does not seem to suffer this. I wonder
if it is a Linux NFS problem...
Anyone come across this before?
Regards
DigbyT
--
Digby R. S. Tarvin digbyt@acm.org
http://www.cthulhu.dircon.co.uk
