linux-kernel - Re: The ext3 way of journalling

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Message-ID: <20080112100835.GA14605@citd.de>
Date:	Sat, 12 Jan 2008 11:08:35 +0100
From:	Matthias Schniedermeyer <ms@...d.de>
To:	TimC <tconnors@...ro.swin.edu.au>
Cc:	Bodo Eggert <7eggert@....de>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Tuomo Valkonen <tuomov@....fi>, linux-kernel@...r.kernel.org
Subject: Re: The ext3 way of journalling

On 12.01.2008 18:10, TimC wrote:
> Bodo Eggert <7eggert@....de> said on Sat, 12 Jan 2008 02:41:17 +0100 (CET):
> > On Fri, 11 Jan 2008, Lennart Sorensen wrote:
> > > On Fri, Jan 11, 2008 at 05:22:45PM +0100, Bodo Eggert wrote:
> > 
> > > > What can happen if someone does tune2fs -Lroot /dev/usbstick
> > > > and puts that stick into this system?
> > > 
> > > Don't know.  I use UUIDs rather than LABELs.  Having duplicated labels
> > > just means being careless.  Having duplicate UUIDs should require being
> > > malicous.
> > 
> > That's exactly what you have to assume for your users. Otherwise, you could 
> > remove any security feature from the system.
> 
> If they've got physical access to your machine, you've already lost.

As a last resort there is always the option to encrypt everything.

Of course you loose the LABEL & UUID support with that.

But i circumvented that by a custom udev script and marking the MBR in 
the documented 4 bytes for an ID that is used by said script to create 
an appropriate symlink.

Together with a matching autofs-conf i can still automatically mount all 
my >50 encrypted HDDs i have stacked on my shelf. :-)






Bis denn

-- 
Real Programmers consider "what you see is what you get" to be just as 
bad a concept in Text Editors as it is in women. No, the Real Programmer
wants a "you asked for it, you got it" text editor -- complicated, 
cryptic, powerful, unforgiving, dangerous.

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