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
next prev 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YhMJoYykeNTVpz7w@sol.localdomain \
--to=ebiggers@kernel.org \
--cc=Jason@zx2c4.com \
--cc=linux-crypto@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@dominikbrodowski.net \
--cc=tytso@mit.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).