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

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Message-ID: <alpine.DEB.2.00.1203141117430.14300@eristoteles.iwoars.net>
Date:	Wed, 14 Mar 2012 11:20:46 +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

For removing the key scheme notion, is it correct to remove:
UBIFS_KEY_MAX_LEN and UBIFS_SK_, UBIFS_S_KEY_BLOCK_BITS, ... and replace
it with a fixed UBIFS_KEY_LEN (and other values), thus also ignoring
key_fmt in key_max_inode_size and simply use a fixed key scheme? Or should
I simply reduce MAX_LEN to 8 but still allow multiple bit assignments
within those 8 bytes via selecting a different key_fmt.

Cheers,
Joel Reardon



On Mon, 12 Mar 2012, Artem Bityutskiy wrote:

> On Mon, 2012-03-12 at 15:30 +0200, Artem Bityutskiy wrote:
> > >  Btw, when I was
> > > developing it I used the last 8 bytes from the key as the key position,
> > > because the key was 16 bytes but only 8 were used. Could you comment on
> > > the last 8 bytes of ubifs keys?
> >
> > 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?
>
> Joel, but please, send small patches, preparation patches, etc. Do not
> disappear for several months and do not come back with another big
> patch. Tell about your intentions in advance.
>
> E.g., if you decide to start using those unused 8 bytes - first do small
> preparations like removing the notion of "key scheme" which we
> provisioned but never used (from comments as well). Clean-up the "space"
> for yourself. Then start using them for your purposes. As I said, as
> soon as I get the first patch I like, I'll create a separate branch in
> the UBIFS git tree for your work.
>
> Thanks!
>
> --
> Best Regards,
> Artem Bityutskiy
>
>
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