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From: Eric Biggers <ebiggers@kernel.org>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
	tytso@mit.edu, linux@dominikbrodowski.net
Subject: Re: [PATCH v2 8/9] random: use hash function for crng_slow_load()
Date: Sun, 20 Feb 2022 19:40:17 -0800	[thread overview]
Message-ID: <YhMJoYykeNTVpz7w@sol.localdomain> (raw)
In-Reply-To: <20220209011919.493762-9-Jason@zx2c4.com>

On Wed, Feb 09, 2022 at 02:19:18AM +0100, Jason A. Donenfeld wrote:
> Since we have a hash function that's really fast, and the goal of
> crng_slow_load() is reportedly to "touch all of the crng's state", we
> can just hash the old state together with the new state and call it a
> day. This way we dont need to reason about another LFSR or worry about
> various attacks there. This code is only ever used at early boot and
> then never again.
> 
> Cc: Theodore Ts'o <tytso@mit.edu>
> Cc: Dominik Brodowski <linux@dominikbrodowski.net>
> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
> ---
>  drivers/char/random.c | 42 +++++++++++++++---------------------------
>  1 file changed, 15 insertions(+), 27 deletions(-)

Reviewed-by: Eric Biggers <ebiggers@google.com>

- Eric

  parent reply	other threads:[~2022-02-21  3:40 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-09  1:19 [PATCH v2 0/9] random: cleanups around per-cpu crng & rdrand Jason A. Donenfeld
2022-02-09  1:19 ` [PATCH v2 1/9] random: use RDSEED instead of RDRAND in entropy extraction Jason A. Donenfeld
2022-02-09  6:18   ` Dominik Brodowski
2022-02-09  1:19 ` [PATCH v2 2/9] random: get rid of secondary crngs Jason A. Donenfeld
2022-02-09  8:22   ` Dominik Brodowski
2022-02-09 10:26     ` Jason A. Donenfeld
2022-02-21  2:38   ` Eric Biggers
2022-02-09  1:19 ` [PATCH v2 3/9] random: inline leaves of rand_initialize() Jason A. Donenfeld
2022-02-09  8:22   ` Dominik Brodowski
2022-02-09 10:27     ` Jason A. Donenfeld
2022-02-09  1:19 ` [PATCH v2 4/9] random: ensure early RDSEED goes through mixer on init Jason A. Donenfeld
2022-02-09  8:23   ` Dominik Brodowski
2022-02-09 10:37     ` Jason A. Donenfeld
2022-02-09  1:19 ` [PATCH v2 5/9] random: do not xor RDRAND when writing into /dev/random Jason A. Donenfeld
2022-02-09  8:28   ` Dominik Brodowski
2022-02-09 10:40     ` Jason A. Donenfeld
2022-02-09  1:19 ` [PATCH v2 6/9] random: absorb fast pool into input pool after fast load Jason A. Donenfeld
2022-02-09  8:29   ` Dominik Brodowski
2022-02-09 10:45     ` Jason A. Donenfeld
2022-02-15 21:13       ` [PATCH v3] " Jason A. Donenfeld
2022-02-21  2:47         ` Eric Biggers
2022-02-21 14:57           ` Jason A. Donenfeld
2022-02-21 14:58             ` [PATCH v4] " Jason A. Donenfeld
2022-02-21 19:08               ` Eric Biggers
2022-02-09  1:19 ` [PATCH v2 7/9] random: use simpler fast key erasure flow on per-cpu keys Jason A. Donenfeld
2022-02-09  8:30   ` Dominik Brodowski
2022-02-09 10:54     ` Jason A. Donenfeld
2022-02-14 18:46   ` [PATCH v3] " Jason A. Donenfeld
2022-02-16 23:21     ` [PATCH v4] " Jason A. Donenfeld
2022-02-21  3:37       ` Eric Biggers
2022-02-21 14:42         ` Jason A. Donenfeld
2022-02-09  1:19 ` [PATCH v2 8/9] random: use hash function for crng_slow_load() Jason A. Donenfeld
2022-02-09  8:30   ` Dominik Brodowski
2022-02-21  3:40   ` Eric Biggers [this message]
2022-02-09  1:19 ` [PATCH v2 9/9] random: remove outdated INT_MAX >> 6 check in urandom_read() Jason A. Donenfeld
2022-02-21  3:56   ` Eric Biggers

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