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Message-ID: <Pine.LNX.4.64.1203202340160.15617@file.rdu.redhat.com>
Date: Tue, 20 Mar 2012 23:44:47 -0400 (EDT)
From: Mikulas Patocka <mpatocka@...hat.com>
To: Mandeep Singh Baines <msb@...omium.org>
cc: device-mapper development <dm-devel@...hat.com>,
Steffen Klassert <steffen.klassert@...unet.com>,
Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org,
Elly Jones <ellyjones@...omium.org>,
Olof Johansson <olofj@...omium.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Alasdair G Kergon <agk@...hat.com>,
Milan Broz <mbroz@...hat.com>
Subject: Re: [dm-devel] [PATCH] dm: remake of the verity target
On Tue, 20 Mar 2012, Mandeep Singh Baines wrote:
> But we are hashing fixed-sized blocks so there is no possibility of extension.
If the first part of some block contains some security-sensitive data and
the last part of the same block can be attacker-controlled, he can use the
collision attack to change the security-sensitive data.
> However, better safe than sorry. I guess we'll just have to deal with
> backward incompatibility. So feel free to add my sign off to the new
> patch also.
>
> Signed-off-by: Mandeep Singh Baines <msb@...omium.org>
>
> Regards,
> Mandeep
>
> > Mikulas
I can introduce a switch to make it accept the old format. Do you want to?
Mikulas
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