From patchwork Wed Jul 16 21:45:35 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Lutomirski X-Patchwork-Id: 4571631 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 56BD6C0514 for ; Wed, 16 Jul 2014 21:47:57 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9761020120 for ; Wed, 16 Jul 2014 21:47:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CB85F2010F for ; Wed, 16 Jul 2014 21:47:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753469AbaGPVrW (ORCPT ); Wed, 16 Jul 2014 17:47:22 -0400 Received: from mail-pd0-f173.google.com ([209.85.192.173]:42727 "EHLO mail-pd0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752905AbaGPVp4 (ORCPT ); Wed, 16 Jul 2014 17:45:56 -0400 Received: by mail-pd0-f173.google.com with SMTP id w10so1904703pde.4 for ; Wed, 16 Jul 2014 14:45:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=3OIJ9ptJryRWuua/eRnwYgqdwWE7D6MErgAU0My06WQ=; b=k108rtHqrJRV6PQMdzOS55JFq4y1u/y3pz/sBFwRdz8viFafy2gPPA2c01rA+Plbvw EfdCmt8p3k8JpBfuD8hzWXLf9vPaHouupkKF5HCmFRIR5EfpdEdlrRM/lt6BXzmaupks HN75fw5fKWmERce5cuuuWaRhc8Ud7/vNYWgC2wh0OyqJMA3bGRnekeqwUhzmWOpIkuoi LCF4VbHJmqfsX0myREHCCdzBfzZ0CC+DiHOr1DInKBJtl7glO71jfn28tP/V2yjAD3sp QgULPLFK5CM9WwC91x16Vr/T61bmYCmUy1O5rt8kceuKADzWHFf9lN0ImfDluKDkqmsp j5pQ== X-Gm-Message-State: ALoCoQmZHx1i71eaqiVcXdz4oPf1ps3GlSqqho3GL9lh8PhDUhQdns+mlt0YIEvOByO4snY8VdGp X-Received: by 10.67.14.161 with SMTP id fh1mr19220148pad.105.1405547155869; Wed, 16 Jul 2014 14:45:55 -0700 (PDT) Received: from localhost (50-76-60-73-ip-static.hfc.comcastbusiness.net. [50.76.60.73]) by mx.google.com with ESMTPSA id bh9sm519643pdb.58.2014.07.16.14.45.53 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 16 Jul 2014 14:45:54 -0700 (PDT) From: Andy Lutomirski To: kvm@vger.kernel.org, "H. Peter Anvin" , Theodore Ts'o , linux-kernel@vger.kernel.org, Kees Cook , x86@kernel.org Cc: Daniel Borkmann , Srivatsa Vaddagiri , Raghavendra K T , Gleb Natapov , Paolo Bonzini , bsd@redhat.com, Andy Lutomirski Subject: [PATCH v3 3/5] random: Seed pools from arch_get_slow_rng_u64 at startup Date: Wed, 16 Jul 2014 14:45:35 -0700 Message-Id: <8de3797d8f49579b0751aea09f7686ef33232146.1405546879.git.luto@amacapital.net> X-Mailer: git-send-email 1.9.3 In-Reply-To: References: In-Reply-To: References: Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This should help solve the problem of guests starting out with predictable RNG state. Signed-off-by: Andy Lutomirski --- drivers/char/random.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/char/random.c b/drivers/char/random.c index 0a7ac0a..17ad33d 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -1261,6 +1261,13 @@ static void init_std_data(struct entropy_store *r) mix_pool_bytes(r, &rv, sizeof(rv), NULL); } mix_pool_bytes(r, utsname(), sizeof(*(utsname())), NULL); + + for (i = 0; i < 4; i++) { + u64 rv64; + + if (arch_get_slow_rng_u64(&rv64)) + mix_pool_bytes(r, &rv64, sizeof(rv64), NULL); + } } /*