Re: [PATCH 3/3] wireguard: device: clear keys on VM fork

[Jason A. Donenfeld]

Hi Michael,

On Wed, Mar 2, 2022 at 9:36 AM Michael S. Tsirkin <mst@xxxxxxxxxx> wrote:
> Catastrophic cryptographic failure sounds bad :(
> So in another thread we discussed that there's a race with this
> approach, and we don't know how big it is. Question is how expensive
> it would be to fix it properly checking for fork after every use of
> key+nonce and before transmitting it. I did a quick microbenchmark
> and it did not seem too bad - care posting some numbers?

I followed up in that thread, which is a larger one, so it might be
easiest to keep discussion there. My response to you here is the same
as it was over there. :)

https://lore.kernel.org/lkml/CAHmME9pf-bjnZuweoLqoFEmPy1OK7ogEgGEAva1T8uVTufhCuw@xxxxxxxxxxxxxx/

Jason