linux-kernel - Re: [PATCH] random: Move rand

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Date:   Tue, 16 Apr 2019 18:00:09 -0500
From:   Kees Cook <keescook@...omium.org>
To:     "Theodore Ts'o" <tytso@....edu>, Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Laura Abbott <labbott@...hat.com>,
        Daniel Micay <danielmicay@...il.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "Tobin C. Harding" <me@...in.cc>, Arnd Bergmann <arnd@...db.de>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] random: Move rand_initialize() earlier

On Tue, Apr 16, 2019 at 11:09 AM Theodore Ts'o <tytso@....edu> wrote:
>
> On Mon, Apr 15, 2019 at 10:46:34PM -0500, Kees Cook wrote:
> > On Fri, Oct 12, 2018 at 9:45 AM Kees Cook <keescook@...omium.org> wrote:
> > >
> > > On Fri, Oct 12, 2018 at 7:29 AM, Theodore Y. Ts'o <tytso@....edu> wrote:
> > > > On Thu, Oct 11, 2018 at 03:54:21PM -0700, Kees Cook wrote:
> > > >> Right now rand_initialize() is run as an early_initcall(), but it only
> > > >> depends on timekeeping_init() (for mixing ktime_get_real() into the
> > > >> pools). However, the call to boot_init_stack_canary() for stack canary
> > > >> initialization runs earlier, which triggers a warning at boot:
> > > >>
> > > >> random: get_random_bytes called from start_kernel+0x357/0x548 with crng_init=0
> > > >>
> > > >> Instead, this moves rand_initialize() to after timekeeping_init(), and moves
> > > >> canary initialization here as well.
> > > >>
> > > >> Note that this warning may still remain for machines that do not have
> > > >> UEFI RNG support (which initializes the RNG pools durting setup_arch()),
> > > >> or for x86 machines without RDRAND (or booting without "random.trust=on"
> > > >> or CONFIG_RANDOM_TRUST_CPU=y).
> > > >>
> > > >> Signed-off-by: Kees Cook <keescook@...omium.org>
> >
> > Hi Ted! Did this get lost? This has come up again, and I don't see it
> > having landed anywhere yet. Can you take this?
>
> Yeah, sorry, it got lost; my bad.  I'll take it and push it out at the
> next merge window.

Awesome; thanks!

-- 
Kees Cook