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 X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79823C2D0DB for ; Mon, 27 Jan 2020 23:14:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 36EDF24679 for ; Mon, 27 Jan 2020 23:14:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=morgul.net header.i=@morgul.net header.b="uZAH94f7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726164AbgA0XOe (ORCPT ); Mon, 27 Jan 2020 18:14:34 -0500 Received: from minas.morgul.net ([128.31.0.48]:36566 "EHLO minas.morgul.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726101AbgA0XOe (ORCPT ); Mon, 27 Jan 2020 18:14:34 -0500 X-Greylist: delayed 738 seconds by postgrey-1.27 at vger.kernel.org; Mon, 27 Jan 2020 18:14:33 EST DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=morgul.net; s=20141010; h=Content-Type:MIME-Version:Message-ID:Subject:To:From:Date: Sender:Reply-To:Cc:Content-Transfer-Encoding:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=t6etz7kZrLLFb8kbDbOp4NCRp7ChqyB2f0+ScI91Qog=; b=uZAH94f7ZUdegQ061m+urd1hAJ YKUVYjrUJZaC7muFXD7H6hHcydIaBpO6sCzgr6ohwyZh41utTHezEhQAy7KxxCkcTSE4stwFWMl6J M1S3vIIKKTWp4Iu1LsqjSrE7dEVcxOdz6SrvWHS/NWVRVnBxOaTQJCdAFqQ2LAhNN+0M=; Received: from frodo by minas.morgul.net with local (Exim 4.92) (envelope-from ) id 1iwDOY-0006fe-TE for stable@vger.kernel.org; Mon, 27 Jan 2020 18:02:14 -0500 Date: Mon, 27 Jan 2020 18:02:14 -0500 From: Noah Meyerhans To: stable@vger.kernel.org Subject: Please apply 50ee7529ec45 ("random: try to actively add entropy rather than passively wait for it") to 4.19.y Message-ID: <20200127230214.GC25530@morgul.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org As detailed in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=948519 and https://wiki.debian.org/BoottimeEntropyStarvation, lack of boot-time entropy can contribute to multi-minute pauses during system initialization in some hardware configurations. While userspace workarounds, e.g. haveged, are documented, the in-kernel jitter entropy collector eliminates the need for such workarounds. It cherry-picks cleanly to 4.19.y and 4.14.y. I'm particularly interested in the former. Thanks for considering this. noah