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

[Mikulas Patocka <mpatocka redhat com>]

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 chromium org>
> 
> Regards,
> Mandeep
> 
> > Mikulas

I can introduce a switch to make it accept the old format. Do you want to?

Mikulas