linux-kernel - Re: [PATCH] random / hw_random: core: start hwrng kthread also for untrusted sources

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Date:   Tue, 20 Sep 2022 16:21:46 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     herbert@...dor.apana.org.au
Cc:     Dominik Brodowski <linux@...inikbrodowski.net>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH] random / hw_random: core: start hwrng kthread also for
 untrusted sources

On Wed, Sep 7, 2022 at 8:34 AM Herbert Xu <herbert@...dor.apana.org.au> wrote:
>
> Dominik Brodowski <linux@...inikbrodowski.net> wrote:
> >
> > diff --git a/drivers/char/random.c b/drivers/char/random.c
> > index 79d7d4e4e582..b360ed4ece03 100644
> > --- a/drivers/char/random.c
> > +++ b/drivers/char/random.c
> > @@ -867,9 +867,9 @@ void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy)
> >
> >        /*
> >         * Throttle writing to once every CRNG_RESEED_INTERVAL, unless
> > -        * we're not yet initialized.
> > +        * we're not yet initialized or this source isn't trusted.
> >         */
> > -       if (!kthread_should_stop() && crng_ready())
> > +       if (!kthread_should_stop() && (crng_ready() || !entropy))
> >                schedule_timeout_interruptible(CRNG_RESEED_INTERVAL);
> > }
> > EXPORT_SYMBOL_GPL(add_hwgenerator_randomness);
>
> Couldn't you split this bit out?

It's been two weeks and Dominik hasn't posted anything new, so I'm
going to do that for him. Patch incoming (retaining his authorship).

Jason