Messages in this thread | | | Date | Tue, 20 Mar 2012 20:49:37 -0700 | Subject | Re: [dm-devel] [PATCH] dm: remake of the verity target | From | Mandeep Singh Baines <> |
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On Tue, Mar 20, 2012 at 8:44 PM, Mikulas Patocka <mpatocka@redhat.com> wrote: > > > 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? >
We can carry that as an out-of-tree patch until we migrate.
On the other hand, it might be nice to support prepend or append.
I don't too strong feelings but it might be nice to have prepend/append flag. Would definitely make our life easier.
> Mikulas
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