linux-kernel - Re: [patch] Adding Secure Deletion to UBIFS

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Message-ID: <alpine.DEB.2.00.1203121430020.29192@eristoteles.iwoars.net>
Date:	Mon, 12 Mar 2012 14:34:41 +0100 (CET)
From:	Joel Reardon <joel@...mbassador.com>
To:	Artem Bityutskiy <dedekind1@...il.com>
cc:	linux-mtd@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] Adding Secure Deletion to UBIFS

>
> I think you can use them. But is it possible to kill these things from
> the data nodes themselves? We can always find it by looking up the index
> by the data node key, right?
>

Yep, thats exactly right. Originally it was just inside the data node;
I put it into the TNC as a optimization later during development. If I use
the last eight bytes from the data node's key, and I remove the position
from ubifs_branch, then there is no longer any change to the on-disk
format, so thats should be useful. Yeah, storing the same value twice
means also needing a consistency check. What can be done is that when the
value is loaded once after mounting, it is stored in in the z-node in
memory.
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