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From: mkhaw@teknowledge-vaxc.ARPA (Mike Khaw)
Newsgroups: comp.bugs.4bsd
Subject: Re: rdump security deficiency, or am I wrong?
Message-ID: <17079@teknowledge-vaxc.ARPA>
Date: Sat, 19-Sep-87 03:20:59 EDT
Article-I.D.: teknowle.17079
Posted: Sat Sep 19 03:20:59 1987
Date-Received: Sun, 20-Sep-87 10:59:26 EDT
References: <83@puffin.USS.TEK.COM>
Organization: Teknowledge, Inc., Palo Alto CA
Lines: 43

in article <83@puffin.USS.TEK.COM>, richl@penguin.USS.TEK.COM (Rick Lindsley) says:
+--------------------
| matt@oddjob.UChicago.EDU (Matt Crawford) wrote:
|> ) >Use:   rdump 0uf dumphost.dumpuser:/dev/tapedev filesystem
| 
| Mike Khaw replied:
|> ) You don't say which version of Sun Unix you have.  I tried this under
|> ) Release 3.2 and rdump complained about a "write error".
| 
| matt@oddjob.UChicago.EDU (Matt Crawford) rereplied:
|> Unless this feature is new in 3.3, I don't know why it didn't work
|> for you.
| 
| Mike, it's possible that whatever non-root user you used couldn't open the
| tape drive. Are your tape drives all world-writable, or could they have
| been protected somehow?
| 
| Rick
+--------------------
Here's what I get from "ls -l /dev/*mt*':

brw-rw-rw-  1 root       8,   0 Jun 19 23:12 /dev/mt0
brw-rw-rw-  1 root       8,  12 Jun 19 23:12 /dev/mt12
brw-rw-rw-  1 root       8,   4 Jun 19 23:12 /dev/mt4
brw-rw-rw-  1 root       8,   8 Jun 19 23:12 /dev/mt8
brw-rw-rw-  1 root       8,   4 Jun 19 23:12 /dev/nmt0
brw-rw-rw-  1 root       8,  12 Jun 19 23:12 /dev/nmt8
crw-rw-rw-  1 root      30,   4 Jun 19 23:12 /dev/nrmt0
crw-rw-rw-  1 root      30,  12 Sep  1 14:19 /dev/nrmt8
crw-rw-rw-  1 root      30,   0 Jun 19 23:12 /dev/rmt0
crw-rw-rw-  1 root      30,  12 Aug 21 11:53 /dev/rmt12
crw-rw-rw-  1 root      30,   4 Jun 19 23:12 /dev/rmt4
crw-rw-rw-  1 root      30,   8 Aug  5 10:44 /dev/rmt8

(this is a 1/2" drive on a Pertec(?) VMEbus controller on a 3/160, and in
case anyone asks (again), yes, the tape had a write-enable ring in it, and
the front panel showed that it was at "load point" before I started rdump.)

Mike Khaw
-- 
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