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Re: Converting an external hard drive enclosure into a write blocker?

Subject: Re: Converting an external hard drive enclosure into a write blocker?
Date: Tue, 20 Nov 2007 09:27:03 +0100
you can mount the storage as read-only - any unix filesystem will
support read-only mount, and provided your root account isnt
compromised, no one can remount it as write. Root cant write to
read-only mounted filesystems without remount either.

mount -r /dev/da2 /readonly in BSD land..

Beware, however, that on journaling file systems such as
ReiserFS or EXT3 you might incidentially change the file
system although it is mounted read-only:

http://www.mail-archive.com/reiserfs-list@namesys.com/msg20263.html

Cheers,

        Stefan.

--------------------------------------------------------
Stefan Kelm
Security Consultant

Secorvo Security Consulting GmbH
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stefan.kelm@secorvo.de, http://www.secorvo.de/
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