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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 873FEC32771 for ; Thu, 9 Jan 2020 11:13:41 +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 505BD20656 for ; Thu, 9 Jan 2020 11:13:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="S75x/UNO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 505BD20656 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]:58416 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipVky-0001ov-9P for qemu-devel@archiver.kernel.org; Thu, 09 Jan 2020 06:13:40 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:53030) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipVhr-0005NQ-SZ for qemu-devel@nongnu.org; Thu, 09 Jan 2020 06:10:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ipVhn-0006PM-RR for qemu-devel@nongnu.org; Thu, 09 Jan 2020 06:10:27 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:41857 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ipVhn-0006NH-LT for qemu-devel@nongnu.org; Thu, 09 Jan 2020 06:10:23 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1578568223; 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=42aHYTnraCF8j7ZCDpVic9NDY8Kr1Y0zecMVba/0vVE=; b=S75x/UNO/dwrbxBeXsbUWQVRnwZ/qBBE1DyCpaxqAJ+F0LbCDqE1GrrqGjjp1Fgx6E/SDk ba3Cr5/l1wrsds/8krGBsZCp5fFed0haUsnk/ObH4/iGEOc+LAe/Cb7f2lAS3fRG5QkjZ7 AlYeklHVyVM8haOyUFcA9OrGN5e5AQc= 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-225-PaE4XJxTOg2LatNWb9x-RA-1; Thu, 09 Jan 2020 06:10:21 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BB5E8107ACCC; Thu, 9 Jan 2020 11:10:20 +0000 (UTC) Received: from localhost (unknown [10.36.118.69]) by smtp.corp.redhat.com (Postfix) with ESMTP id D1C9710027A6; Thu, 9 Jan 2020 11:10:17 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH v2 1/4] luks: extract block_crypto_calculate_payload_offset() Date: Thu, 9 Jan 2020 11:10:09 +0000 Message-Id: <20200109111012.559052-2-stefanha@redhat.com> In-Reply-To: <20200109111012.559052-1-stefanha@redhat.com> References: <20200109111012.559052-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: PaE4XJxTOg2LatNWb9x-RA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 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: Kevin Wolf , Stefan Hajnoczi , qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The qcow2 .bdrv_measure() code calculates the crypto payload offset. This logic really belongs in block/crypto.c where it can be reused by other image formats. The "luks" block driver will need this same logic in order to implement .bdrv_measure(), so extract the block_crypto_calculate_payload_offset() function now. Signed-off-by: Stefan Hajnoczi --- block/crypto.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++ block/crypto.h | 5 ++++ block/qcow2.c | 59 ++++------------------------------------------ 3 files changed, 73 insertions(+), 55 deletions(-) diff --git a/block/crypto.c b/block/crypto.c index 24823835c1..ed32202fa2 100644 --- a/block/crypto.c +++ b/block/crypto.c @@ -185,6 +185,70 @@ block_crypto_create_opts_init(QDict *opts, Error **err= p) } =20 =20 +static ssize_t block_crypto_headerlen_hdr_init_func(QCryptoBlock *block, + size_t headerlen, void *opaque, Error **errp) +{ + size_t *headerlenp =3D opaque; + + /* Stash away the payload size */ + *headerlenp =3D headerlen; + return 0; +} + + +static ssize_t block_crypto_headerlen_hdr_write_func(QCryptoBlock *block, + size_t offset, const uint8_t *buf, size_t buflen, + void *opaque, Error **errp) +{ + /* Discard the bytes, we're not actually writing to an image */ + return buflen; +} + + +/* Determine the number of bytes for the crypto header */ +bool block_crypto_calculate_payload_offset(QemuOpts *opts, + const char *optprefix, + size_t *len, + Error **errp) +{ + QDict *cryptoopts_qdict; + QCryptoBlockCreateOptions *cryptoopts; + QCryptoBlock *crypto; + + /* Extract options into a qdict */ + if (optprefix) { + QDict *opts_qdict =3D qemu_opts_to_qdict(opts, NULL); + + qdict_extract_subqdict(opts_qdict, &cryptoopts_qdict, optprefix); + qobject_unref(opts_qdict); + } else { + cryptoopts_qdict =3D qemu_opts_to_qdict(opts, NULL); + } + + /* Build QCryptoBlockCreateOptions object from qdict */ + qdict_put_str(cryptoopts_qdict, "format", "luks"); + + cryptoopts =3D block_crypto_create_opts_init(cryptoopts_qdict, errp); + qobject_unref(cryptoopts_qdict); + if (!cryptoopts) { + return false; + } + + /* Fake LUKS creation in order to determine the payload size */ + crypto =3D qcrypto_block_create(cryptoopts, optprefix, + block_crypto_headerlen_hdr_init_func, + block_crypto_headerlen_hdr_write_func, + len, errp); + qapi_free_QCryptoBlockCreateOptions(cryptoopts); + if (!crypto) { + return false; + } + + qcrypto_block_free(crypto); + return true; +} + + static int block_crypto_open_generic(QCryptoBlockFormat format, QemuOptsList *opts_spec, BlockDriverState *bs, diff --git a/block/crypto.h b/block/crypto.h index b935695e79..5a39bee71b 100644 --- a/block/crypto.h +++ b/block/crypto.h @@ -94,4 +94,9 @@ block_crypto_create_opts_init(QDict *opts, Error **errp); QCryptoBlockOpenOptions * block_crypto_open_opts_init(QDict *opts, Error **errp); =20 +bool block_crypto_calculate_payload_offset(QemuOpts *opts, + const char *optprefix, + size_t *len, + Error **errp); + #endif /* BLOCK_CRYPTO_H */ diff --git a/block/qcow2.c b/block/qcow2.c index cef9d72b3a..3aaf79bbf6 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -4609,60 +4609,6 @@ static coroutine_fn int qcow2_co_flush_to_os(BlockDr= iverState *bs) return ret; } =20 -static ssize_t qcow2_measure_crypto_hdr_init_func(QCryptoBlock *block, - size_t headerlen, void *opaque, Error **errp) -{ - size_t *headerlenp =3D opaque; - - /* Stash away the payload size */ - *headerlenp =3D headerlen; - return 0; -} - -static ssize_t qcow2_measure_crypto_hdr_write_func(QCryptoBlock *block, - size_t offset, const uint8_t *buf, size_t buflen, - void *opaque, Error **errp) -{ - /* Discard the bytes, we're not actually writing to an image */ - return buflen; -} - -/* Determine the number of bytes for the LUKS payload */ -static bool qcow2_measure_luks_headerlen(QemuOpts *opts, size_t *len, - Error **errp) -{ - QDict *opts_qdict; - QDict *cryptoopts_qdict; - QCryptoBlockCreateOptions *cryptoopts; - QCryptoBlock *crypto; - - /* Extract "encrypt." options into a qdict */ - opts_qdict =3D qemu_opts_to_qdict(opts, NULL); - qdict_extract_subqdict(opts_qdict, &cryptoopts_qdict, "encrypt."); - qobject_unref(opts_qdict); - - /* Build QCryptoBlockCreateOptions object from qdict */ - qdict_put_str(cryptoopts_qdict, "format", "luks"); - cryptoopts =3D block_crypto_create_opts_init(cryptoopts_qdict, errp); - qobject_unref(cryptoopts_qdict); - if (!cryptoopts) { - return false; - } - - /* Fake LUKS creation in order to determine the payload size */ - crypto =3D qcrypto_block_create(cryptoopts, "encrypt.", - qcow2_measure_crypto_hdr_init_func, - qcow2_measure_crypto_hdr_write_func, - len, errp); - qapi_free_QCryptoBlockCreateOptions(cryptoopts); - if (!crypto) { - return false; - } - - qcrypto_block_free(crypto); - return true; -} - static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *i= n_bs, Error **errp) { @@ -4715,7 +4661,10 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opt= s, BlockDriverState *in_bs, if (has_luks) { size_t headerlen; =20 - if (!qcow2_measure_luks_headerlen(opts, &headerlen, &local_err)) { + if (!block_crypto_calculate_payload_offset(opts, + "encrypt.", + &headerlen, + &local_err)) { goto err; } =20 --=20 2.24.1