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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 119F3C433DF for ; Mon, 15 Jun 2020 10:37:44 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D0C7420663 for ; Mon, 15 Jun 2020 10:37:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZslIfXtE" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D0C7420663 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:56604 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jkmUo-0002Ok-Vx for qemu-devel@archiver.kernel.org; Mon, 15 Jun 2020 06:37:43 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52482) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jkmTs-0000ft-Et for qemu-devel@nongnu.org; Mon, 15 Jun 2020 06:36:44 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:57523 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jkmTq-0007Rn-HA for qemu-devel@nongnu.org; Mon, 15 Jun 2020 06:36:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592217401; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DcbBSo5vE0YFfV2gRVV5Ik/OnmR1K71bEatWoKpYXhs=; b=ZslIfXtEe10bTpsZoMPZ+oBqdDTzDgdRexVFEA1zWJs21ACuHJExLZOwUMle3cylqbvacP 2FCb7d2dYFaILeDb+n1gNWtmMdVA4dOshw6EPGpEY9uSIUdLjgLcCMVPRjpWI2YlJcKv7a SdylRmdsvHPoBQeIoDD0u+aGNijU+cY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-395-w3jN1ibtM3CcjVe4FauUZw-1; Mon, 15 Jun 2020 06:36:37 -0400 X-MC-Unique: w3jN1ibtM3CcjVe4FauUZw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E29B9835B48; Mon, 15 Jun 2020 10:36:36 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.36.110.57]) by smtp.corp.redhat.com (Postfix) with ESMTP id ED8985D9CD; Mon, 15 Jun 2020 10:36:35 +0000 (UTC) From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PULL 1/5] crypto: add "none" random provider Date: Mon, 15 Jun 2020 11:36:29 +0100 Message-Id: <20200615103633.300208-2-berrange@redhat.com> In-Reply-To: <20200615103633.300208-1-berrange@redhat.com> References: <20200615103633.300208-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Received-SPF: pass client-ip=207.211.31.120; envelope-from=berrange@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/15 01:17:36 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Marek Marczykowski-Górecki In case of not using random-number needing feature, it makes sense to skip RNG init too. This is especially helpful when QEMU is sandboxed in Stubdomain under Xen, where there is very little entropy so initial getrandom() call delays the startup several seconds. In that setup, no random bytes are needed at all. Signed-off-by: Marek Marczykowski-Górecki Signed-off-by: Daniel P. Berrangé --- configure | 11 +++++++++++ crypto/Makefile.objs | 3 ++- crypto/random-none.c | 38 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 51 insertions(+), 1 deletion(-) create mode 100644 crypto/random-none.c diff --git a/configure b/configure index bb7fd12612..997284e094 100755 --- a/configure +++ b/configure @@ -509,6 +509,7 @@ libpmem="" default_devices="yes" plugins="no" fuzzing="no" +rng_none="no" supported_cpu="no" supported_os="no" @@ -1601,6 +1602,10 @@ for opt do ;; --gdb=*) gdb_bin="$optarg" ;; + --enable-rng-none) rng_none=yes + ;; + --disable-rng-none) rng_none=no + ;; *) echo "ERROR: unknown option $opt" echo "Try '$0 --help' for more information" @@ -1898,6 +1903,7 @@ disabled with --disable-FEATURE, default is enabled if available: debug-mutex mutex debugging support libpmem libpmem support xkbcommon xkbcommon support + rng-none dummy RNG, avoid using /dev/(u)random and getrandom() NOTE: The object files are built at the place where configure is launched EOF @@ -6767,6 +6773,7 @@ echo "default devices $default_devices" echo "plugin support $plugins" echo "fuzzing support $fuzzing" echo "gdb $gdb_bin" +echo "rng-none $rng_none" if test "$supported_cpu" = "no"; then echo @@ -7744,6 +7751,10 @@ if test "$edk2_blobs" = "yes" ; then echo "DECOMPRESS_EDK2_BLOBS=y" >> $config_host_mak fi +if test "$rng_none" = "yes"; then + echo "CONFIG_RNG_NONE=y" >> $config_host_mak +fi + # use included Linux headers if test "$linux" = "yes" ; then mkdir -p linux-headers diff --git a/crypto/Makefile.objs b/crypto/Makefile.objs index c2a371b0b4..cdee92b4e5 100644 --- a/crypto/Makefile.objs +++ b/crypto/Makefile.objs @@ -35,5 +35,6 @@ crypto-obj-y += block-luks.o util-obj-$(CONFIG_GCRYPT) += random-gcrypt.o util-obj-$(if $(CONFIG_GCRYPT),n,$(CONFIG_GNUTLS)) += random-gnutls.o -util-obj-$(if $(CONFIG_GCRYPT),n,$(if $(CONFIG_GNUTLS),n,y)) += random-platform.o +util-obj-$(if $(CONFIG_GCRYPT),n,$(if $(CONFIG_GNUTLS),n,$(CONFIG_RNG_NONE))) += random-none.o +util-obj-$(if $(CONFIG_GCRYPT),n,$(if $(CONFIG_GNUTLS),n,$(if $(CONFIG_RNG_NONE),n,y))) += random-platform.o util-obj-y += aes.o init.o diff --git a/crypto/random-none.c b/crypto/random-none.c new file mode 100644 index 0000000000..102f8a4dce --- /dev/null +++ b/crypto/random-none.c @@ -0,0 +1,38 @@ +/* + * QEMU Crypto "none" random number provider + * + * Copyright (c) 2020 Marek Marczykowski-Górecki + * + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + * + */ + +#include "qemu/osdep.h" + +#include "crypto/random.h" +#include "qapi/error.h" + +int qcrypto_random_init(Error **errp) +{ + return 0; +} + +int qcrypto_random_bytes(void *buf, + size_t buflen, + Error **errp) +{ + error_setg(errp, "Random bytes not available with \"none\" rng"); + return -1; +} -- 2.26.2