From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2601AC433EF for ; Thu, 23 Jun 2022 17:56:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235314AbiFWR4W (ORCPT ); Thu, 23 Jun 2022 13:56:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235646AbiFWRw7 (ORCPT ); Thu, 23 Jun 2022 13:52:59 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55F07A8B6E; Thu, 23 Jun 2022 10:13:48 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6E4E961D17; Thu, 23 Jun 2022 17:13:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4A550C3411B; Thu, 23 Jun 2022 17:13:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1656004426; bh=MuUF0Ibb2Dea1LHOE/d3WkUCemoyfGQMOCwEgo8brko=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x8IRn3tvZuGhJPDEw97SJGKzbwcmeltD2h6y2cjCMUYTzjyY+mResQK+b0i54sMTz TFHGX96ICRmePvo090f5i9yTT4mwbKGtKR7aXYVPnJKTg+Vaas5gdrIMsYOE266LNm oBmYBPplg8i8Y0FUQVui80j3TyWpk2omiApTYrv0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mark Rutland , Mark Brown , Theodore Tso , "Jason A. Donenfeld" Subject: [PATCH 4.19 033/234] random: split primary/secondary crng init paths Date: Thu, 23 Jun 2022 18:41:40 +0200 Message-Id: <20220623164344.003169695@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220623164343.042598055@linuxfoundation.org> References: <20220623164343.042598055@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mark Rutland commit 5cbe0f13b51ac2fb2fd55902cff8d0077fc084c0 upstream. Currently crng_initialize() is used for both the primary CRNG and secondary CRNGs. While we wish to share common logic, we need to do a number of additional things for the primary CRNG, and this would be easier to deal with were these handled in separate functions. This patch splits crng_initialize() into crng_initialize_primary() and crng_initialize_secondary(), with common logic factored out into a crng_init_try_arch() helper. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland Cc: Mark Brown Cc: Theodore Ts'o Link: https://lore.kernel.org/r/20200210130015.17664-2-mark.rutland@arm.com Signed-off-by: Theodore Ts'o Signed-off-by: Jason A. Donenfeld Signed-off-by: Greg Kroah-Hartman --- drivers/char/random.c | 34 ++++++++++++++++++++++------------ 1 file changed, 22 insertions(+), 12 deletions(-) --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -783,27 +783,37 @@ static int __init parse_trust_cpu(char * } early_param("random.trust_cpu", parse_trust_cpu); -static void crng_initialize(struct crng_state *crng) +static bool crng_init_try_arch(struct crng_state *crng) { int i; - int arch_init = 1; + bool arch_init = true; unsigned long rv; - memcpy(&crng->state[0], "expand 32-byte k", 16); - if (crng == &primary_crng) - _extract_entropy(&input_pool, &crng->state[4], - sizeof(__u32) * 12, 0); - else - _get_random_bytes(&crng->state[4], sizeof(__u32) * 12); for (i = 4; i < 16; i++) { if (!arch_get_random_seed_long(&rv) && !arch_get_random_long(&rv)) { rv = random_get_entropy(); - arch_init = 0; + arch_init = false; } crng->state[i] ^= rv; } - if (trust_cpu && arch_init && crng == &primary_crng) { + + return arch_init; +} + +static void crng_initialize_secondary(struct crng_state *crng) +{ + memcpy(&crng->state[0], "expand 32-byte k", 16); + _get_random_bytes(&crng->state[4], sizeof(__u32) * 12); + crng_init_try_arch(crng); + crng->init_time = jiffies - CRNG_RESEED_INTERVAL - 1; +} + +static void __init crng_initialize_primary(struct crng_state *crng) +{ + memcpy(&crng->state[0], "expand 32-byte k", 16); + _extract_entropy(&input_pool, &crng->state[4], sizeof(__u32) * 12, 0); + if (crng_init_try_arch(crng) && trust_cpu) { invalidate_batched_entropy(); numa_crng_init(); crng_init = 2; @@ -854,7 +864,7 @@ static void do_numa_crng_init(struct wor crng = kmalloc_node(sizeof(struct crng_state), GFP_KERNEL | __GFP_NOFAIL, i); spin_lock_init(&crng->lock); - crng_initialize(crng); + crng_initialize_secondary(crng); pool[i] = crng; } /* pairs with READ_ONCE() in select_crng() */ @@ -1792,7 +1802,7 @@ int __init rand_initialize(void) init_std_data(&input_pool); if (crng_need_final_init) crng_finalize_init(&primary_crng); - crng_initialize(&primary_crng); + crng_initialize_primary(&primary_crng); crng_global_init_time = jiffies; if (ratelimit_disable) { urandom_warning.interval = 0;