Re: [PATCH v3 1/2] random: add mechanism for VM forks to reinitialize crng

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On Fri, Feb 25, 2022 at 12:26 PM Ard Biesheuvel <ardb@xxxxxxxxxx> wrote:
>
> On Thu, 24 Feb 2022 at 14:39, Jason A. Donenfeld <Jason@xxxxxxxxx> wrote:
> >
> > When a VM forks, we must immediately mix in additional information to
> > the stream of random output so that two forks or a rollback don't
> > produce the same stream of random numbers, which could have catastrophic
> > cryptographic consequences. This commit adds a simple API, add_vmfork_
> > randomness(), for that, by force reseeding the crng.
> >
> > This has the added benefit of also draining the entropy pool and setting
> > its timer back, so that any old entropy that was there prior -- which
> > could have already been used by a different fork, or generally gone
> > stale -- does not contribute to the accounting of the next 256 bits.
> >
> > Cc: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
> > Cc: Theodore Ts'o <tytso@xxxxxxx>
> > Cc: Jann Horn <jannh@xxxxxxxxxx>
> > Cc: Eric Biggers <ebiggers@xxxxxxxxxx>
> > Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
>
> Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>

Okay if I treat this as a Reviewed-by instead?



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