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Message-Id: <20200921075857.4424-13-nstange@suse.de>
Date: Mon, 21 Sep 2020 09:58:28 +0200
From: Nicolai Stange <nstange@...e.de>
To: "Theodore Y. Ts'o" <tytso@....edu>
Cc: linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
"Alexander E. Patrakov" <patrakov@...il.com>,
"Ahmed S. Darwish" <darwish.07@...il.com>,
Willy Tarreau <w@....eu>,
Matthew Garrett <mjg59@...f.ucam.org>,
Vito Caputo <vcaputo@...garu.com>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Jan Kara <jack@...e.cz>, Ray Strode <rstrode@...hat.com>,
William Jon McCann <mccann@....edu>,
zhangjs <zachary@...shancloud.com>,
Andy Lutomirski <luto@...nel.org>,
Florian Weimer <fweimer@...hat.com>,
Lennart Poettering <mzxreary@...inter.de>,
Peter Matthias <matthias.peter@....bund.de>,
Marcelo Henrique Cerri <marcelo.cerri@...onical.com>,
Roman Drahtmueller <draht@...altsekun.de>,
Neil Horman <nhorman@...hat.com>,
Randy Dunlap <rdunlap@...radead.org>,
Julia Lawall <julia.lawall@...ia.fr>,
Dan Carpenter <dan.carpenter@...cle.com>,
Andy Lavr <andy.lavr@...il.com>,
Eric Biggers <ebiggers@...nel.org>,
"Jason A. Donenfeld" <Jason@...c4.com>,
Stephan Müller <smueller@...onox.de>,
Torsten Duwe <duwe@...e.de>, Petr Tesarik <ptesarik@...e.cz>,
Nicolai Stange <nstange@...e.de>
Subject: [RFC PATCH 12/41] random: convert add_interrupt_randomness() to queued_entropy API
In an effort to drop __credit_entropy_bits_fast() in favor of the new
__queue_entropy()/__dispatch_queued_entropy_fast() API, convert
add_interrupt_randomness() from the former to the latter.
There is no change in functionality at this point, because
__credit_entropy_bits_fast() has already been reimplemented on top of the
new API before.
Signed-off-by: Nicolai Stange <nstange@...e.de>
---
drivers/char/random.c | 28 ++++++++++++++++------------
1 file changed, 16 insertions(+), 12 deletions(-)
diff --git a/drivers/char/random.c b/drivers/char/random.c
index e8c86abde901..bd3774c6be4b 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1512,6 +1512,7 @@ void add_interrupt_randomness(int irq, int irq_flags)
unsigned long seed;
int credit = 0;
bool reseed;
+ struct queued_entropy q = { 0 };
if (cycles == 0)
cycles = get_reg(fast_pool, regs);
@@ -1546,24 +1547,27 @@ void add_interrupt_randomness(int irq, int irq_flags)
if (!spin_trylock(&r->lock))
return;
- fast_pool->last = now;
- __mix_pool_bytes(r, &fast_pool->pool, sizeof(fast_pool->pool));
-
/*
* If we have architectural seed generator, produce a seed and
- * add it to the pool. For the sake of paranoia don't let the
- * architectural seed generator dominate the input from the
- * interrupt noise.
+ * add it to the pool further below. For the sake of paranoia
+ * don't let the architectural seed generator dominate the
+ * input from the interrupt noise.
*/
- if (arch_get_random_seed_long(&seed)) {
- __mix_pool_bytes(r, &seed, sizeof(seed));
- credit = 1;
- }
+ credit = !!arch_get_random_long(&seed);
+ fast_pool->last = now;
fast_pool->count = 0;
-
/* award one bit for the contents of the fast pool */
- reseed = __credit_entropy_bits_fast(r, credit + 1);
+ __queue_entropy(r, &q, (credit + 1) << ENTROPY_SHIFT);
+ __mix_pool_bytes(r, &fast_pool->pool, sizeof(fast_pool->pool));
+ if (credit) {
+ /*
+ * A seed has been obtained from
+ * arch_get_random_seed_long() above, mix it in.
+ */
+ __mix_pool_bytes(r, &seed, sizeof(seed));
+ }
+ reseed = __dispatch_queued_entropy_fast(r, &q);
spin_unlock(&r->lock);
if (reseed)
crng_reseed(&primary_crng, r);
--
2.26.2
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