linux-hardening - Re: [PATCH] random: split initialization into early arch step and later non-arch step

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Date:   Tue, 27 Sep 2022 11:30:51 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] random: split initialization into early arch step and
 later non-arch step

On Tue, Sep 27, 2022 at 10:34:16AM +0200, Jason A. Donenfeld wrote:
> > > Yes, we could maybe *change* to using init_utsname if we wanted. That
> > > seems kind of different though. So I'd prefer that to be a different
> > > patch, which would require looking at the interaction with early
> > > hostname setting and such. If you want to do that work, I'd certainly
> > > welcome the patch.
> >
> > Er, isn't that _WAY_ later? Like, hostname isn't set until sysctls up
> > and running, etc. I haven't actually verified 100% but it looks like
> > current->utsname is exactly init_utsname currently.
> 
> If init_utsname()==utsname() and all is fine, can you please send a
> patch atop random.git adjusting that and explaining why? I would
> happily take such a patch. If your suspicion is correct, it would make
> a most welcome improvement.

https://lore.kernel.org/lkml/20220927092920.1559685-1-Jason@zx2c4.com