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 EED02C43334 for ; Mon, 20 Jun 2022 13:30:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345140AbiFTNaB (ORCPT ); Mon, 20 Jun 2022 09:30:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346256AbiFTN2w (ORCPT ); Mon, 20 Jun 2022 09:28:52 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A74023BE8; Mon, 20 Jun 2022 06:11:37 -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 ams.source.kernel.org (Postfix) with ESMTPS id 006F8B811EA; Mon, 20 Jun 2022 13:10:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45624C3411B; Mon, 20 Jun 2022 13:10:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655730654; bh=pcD20pTjXc0OFvfBkI7Jf92GEK2cRr+LG3vaDSjPkLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kGgzEujNdNrT36ekwSZZfPtpztZBTPkRq+UHQ5RmvGROp8wqP7+HF/XpQlnjGXlBS V0mkCA9yg1vOCu4NRVBMtieq8h2N9YHYTD9qt36viqml00sg4MXrCdjTP8yCGQ9HkV 0Sq34qR0DztrCJdGoj/2UF21G7Pq9gG8uNIs1XMY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andy Lutomirski , Theodore Tso , "Jason A. Donenfeld" Subject: [PATCH 5.4 015/240] random: delete code to pull data into pools Date: Mon, 20 Jun 2022 14:48:36 +0200 Message-Id: <20220620124738.252986941@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220620124737.799371052@linuxfoundation.org> References: <20220620124737.799371052@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: stable@vger.kernel.org From: Andy Lutomirski commit 84df7cdfbb215a34657b39f4257dab739efa2df9 upstream. There is no pool that pulls, so it was just dead code. Signed-off-by: Andy Lutomirski Link: https://lore.kernel.org/r/4a05fe0c7a5c831389ef4aea51d24528ac8682c7.1577088521.git.luto@kernel.org Signed-off-by: Theodore Ts'o Signed-off-by: Jason A. Donenfeld Signed-off-by: Greg Kroah-Hartman --- drivers/char/random.c | 40 ---------------------------------------- 1 file changed, 40 deletions(-) --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -529,10 +529,8 @@ struct entropy_store { const struct poolinfo *poolinfo; __u32 *pool; const char *name; - struct entropy_store *pull; /* read-write data: */ - unsigned long last_pulled; spinlock_t lock; unsigned short add_ptr; unsigned short input_rotate; @@ -1368,41 +1366,6 @@ EXPORT_SYMBOL_GPL(add_disk_randomness); *********************************************************************/ /* - * This utility inline function is responsible for transferring entropy - * from the primary pool to the secondary extraction pool. We make - * sure we pull enough for a 'catastrophic reseed'. - */ -static void _xfer_secondary_pool(struct entropy_store *r, size_t nbytes); -static void xfer_secondary_pool(struct entropy_store *r, size_t nbytes) -{ - if (!r->pull || - r->entropy_count >= (nbytes << (ENTROPY_SHIFT + 3)) || - r->entropy_count > r->poolinfo->poolfracbits) - return; - - _xfer_secondary_pool(r, nbytes); -} - -static void _xfer_secondary_pool(struct entropy_store *r, size_t nbytes) -{ - __u32 tmp[OUTPUT_POOL_WORDS]; - - int bytes = nbytes; - - /* pull at least as much as a wakeup */ - bytes = max_t(int, bytes, random_read_wakeup_bits / 8); - /* but never more than the buffer size */ - bytes = min_t(int, bytes, sizeof(tmp)); - - trace_xfer_secondary_pool(r->name, bytes * 8, nbytes * 8, - ENTROPY_BITS(r), ENTROPY_BITS(r->pull)); - bytes = extract_entropy(r->pull, tmp, bytes, - random_read_wakeup_bits / 8, 0); - mix_pool_bytes(r, tmp, bytes); - credit_entropy_bits(r, bytes*8); -} - -/* * This function decides how many bytes to actually take from the * given pool, and also debits the entropy count accordingly. */ @@ -1565,7 +1528,6 @@ static ssize_t extract_entropy(struct en spin_unlock_irqrestore(&r->lock, flags); trace_extract_entropy(r->name, EXTRACT_SIZE, ENTROPY_BITS(r), _RET_IP_); - xfer_secondary_pool(r, EXTRACT_SIZE); extract_buf(r, tmp); spin_lock_irqsave(&r->lock, flags); memcpy(r->last_data, tmp, EXTRACT_SIZE); @@ -1574,7 +1536,6 @@ static ssize_t extract_entropy(struct en } trace_extract_entropy(r->name, nbytes, ENTROPY_BITS(r), _RET_IP_); - xfer_secondary_pool(r, nbytes); nbytes = account(r, nbytes, min, reserved); return _extract_entropy(r, buf, nbytes, fips_enabled); @@ -1846,7 +1807,6 @@ static void __init init_std_data(struct ktime_t now = ktime_get_real(); unsigned long rv; - r->last_pulled = jiffies; mix_pool_bytes(r, &now, sizeof(now)); for (i = r->poolinfo->poolbytes; i > 0; i -= sizeof(rv)) { if (!arch_get_random_seed_long(&rv) &&