From patchwork Sat Nov 5 20:44:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 13033240 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 6E4C5C4332F for ; Sat, 5 Nov 2022 20:44:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229517AbiKEUoZ (ORCPT ); Sat, 5 Nov 2022 16:44:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229479AbiKEUoZ (ORCPT ); Sat, 5 Nov 2022 16:44:25 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 64D13E0F2 for ; Sat, 5 Nov 2022 13:44:24 -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 E35F460B97 for ; Sat, 5 Nov 2022 20:44:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB346C433D6; Sat, 5 Nov 2022 20:44:22 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="F0RKbDv0" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1667681060; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=znuX4ysjKgHs+5ugNojvf7s4WgKzUG5UmonkOsznGCw=; b=F0RKbDv0TU77lzWJdb7DejrFTgXswFouZ7MNaRK0c9rqOD+hukgY1Qsi48sUTfZR8BKY/B a1OSMAEmrAZNf7TvmlC+XSHnk0J/kSJlt1yjdkscnrcOmaIIFeGZsyMpNuD90MPmYgX3f/ dY0NLbtrNkYIozI979581Gl55yHoZ+E= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id 2e7be018 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Sat, 5 Nov 2022 20:44:19 +0000 (UTC) From: "Jason A. Donenfeld" To: herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org Cc: "Jason A. Donenfeld" Subject: [PATCH] hw_random: use add_hwgenerator_randomness() for early entropy Date: Sat, 5 Nov 2022 21:44:17 +0100 Message-Id: <20221105204417.137001-1-Jason@zx2c4.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Rather than calling add_device_randomness(), the add_early_randomness() function should use add_hwgenerator_randomness(), so that the early entropy can be potentially credited, which allows for the RNG to initialize earlier without having to wait for the kthread to come up. Cc: Herbert Xu Signed-off-by: Jason A. Donenfeld --- drivers/char/hw_random/core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index cc002b0c2f0c..8c0819ce2781 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -69,8 +69,10 @@ static void add_early_randomness(struct hwrng *rng) mutex_lock(&reading_mutex); bytes_read = rng_get_data(rng, rng_fillbuf, 32, 0); mutex_unlock(&reading_mutex); - if (bytes_read > 0) - add_device_randomness(rng_fillbuf, bytes_read); + if (bytes_read > 0) { + size_t entropy = bytes_read * 8 * rng->quality / 1024; + add_hwgenerator_randomness(rng_fillbuf, bytes_read, entropy); + } } static inline void cleanup_rng(struct kref *kref)