linux-kernel - Re: [dm-devel] [PATCH] dm: remake of the verity target

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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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