[dm-devel] [RFC PATCH 0/2] dm crypt: Allow unaligned buffer lengths for skcipher devices
Mikulas Patocka
mpatocka at redhat.com
Thu Sep 24 12:47:30 UTC 2020
On Wed, 23 Sep 2020, Mike Snitzer wrote:
> You've clearly done a nice job with these changes. Looks clean.
>
> BUT, I'm struggling to just accept that dm-crypt needs to go to these
> extra lengths purely because of one bad apple usecase.
>
> These alignment constraints aren't new. Are there other portions of
> Linux's crypto subsystem that needed comparable fixes in order to work
> with Microsfot OS initiated IO through a guest?
>
> You forecast that these same kinds of changes are needed for AEAD and
> dm-integrity... that's alarming.
... and dm-writecache also expects that the bio is aligned ...
Mikulas
> Are we _certain_ there is no other way forward?
> (Sorry I don't have suggestions.. I'm in "fact finding mode" ;)
>
> Thanks,
> Mike
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