From patchwork Fri Apr 16 03:05:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 423033 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 CA59FC433B4 for ; Fri, 16 Apr 2021 03:05:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ACE1E610FB for ; Fri, 16 Apr 2021 03:05:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237764AbhDPDGF (ORCPT ); Thu, 15 Apr 2021 23:06:05 -0400 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:63371 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237593AbhDPDGA (ORCPT ); Thu, 15 Apr 2021 23:06:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1618542335; x=1650078335; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7xpGw5gOit7hgiXUka877UmTYdM1ZmxbqzhNHdLZabs=; b=Tx05KlTGk2/vWIo0d6ssD1I+M6OpOTjM3NCsr0GcEWInENSR/o+hfsXE aBTHSXqN3jMrqFsPBT3ozBSl9zcgpGDBPMMSiE/uC07DAoESvUKimEPp/ mpCplCS+YecAa85W9JxzLbX/U+RrkDDS7jr1QaONZbipro3q7uTixiE+z 1Cj+gN2EXAh50l9i4nWH168uzKAorP1C7VD5fsFsz484PhkWB/8PWyj3t 4HBoNS71KjeEvxIB1CjjNUZg6Bp86sIBcW3XWH19vTjtr/+ttzIIud1IU g4VMdZhq+2MK2HLys+L5DXTBxFGVi8XA5oeDCkwW8UzQmZ9BJ1sg+Xyjv A==; IronPort-SDR: rtOdSX0tb3/sbl2mwTe9ibEUqbZbeR3GqelApw5evYWj10jqMaRvLG0DZ0CYfm7oAui7f6fE74 pxsWC/VwQ7BrkN6O5DUYHEAexCOebR9sIARKK5CykSysCBqoPYrm3ki2Zubkz9iBM3awUTg/3+ PM2wX1SKXrPe4x2ohJQXr9Yk2n/bcjE1pAHbPggFpzqiFgqRFPTsFnFi2+wt+CRSgba+rpkiO6 r8nFJzRmfskzrn6TEmkUgb3q7DL7I3Fsolib5ibl2kPUrSNAgw5QzbxLBsC9T5We2ATOjfn+rK EM0= X-IronPort-AV: E=Sophos;i="5.82,226,1613404800"; d="scan'208";a="169567883" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 16 Apr 2021 11:05:35 +0800 IronPort-SDR: NTf6YD+kTvlYGxs2Gb7w2WGaEojr+5+V8jgErNcIckQr9OuVGebNXY5+Fd+mQySKwnzMsJOMoA PQAM0ObdPMW3x+MG/UsngoyxBGBa8e6t1TMGVNxpiJNfOT3nZufjJRrG4gy3XGorvFiyXZaSSy C2kkaH66fIXh1DUujuaHEVMDJ1R+Q/Dg2R0w4FOZZjOpFYalgO9wB7hlwbxpES9Wn6Y4TieGkX 0B5MPa/8jUR3KXS+/BDSr+Y+DgxG0Qe0gX29Dj/0GkHsgiMNVWHv4EBmqz4kWUDR0UTJIRqXEv U/7e1tnEACK5+tEwpcwtrdDQ Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Apr 2021 19:44:54 -0700 IronPort-SDR: reXaIl08fufcrKmwqlTrWikXVN+K7DeRaEHrim6atgn6l0Yzshs6cwZfuVPyG/kvBFwDZwOrfr KS+rIvyqVDxgc7Gk/123Bm8msgUO6s4kvzkQ+qbbMhLQMA2VUtrz2kPI7Uz0wH9p97zvdy+QzB dBNntEhDmRfVb+H6+MNJdlgbWRYLOtg4nGCU+7WubVXDhzMhGvHAgjkXjcQHedj6A+mGlgbgKU F2qkOL1fodLfhCMmK6ceLxyGqBvX+6LMi073Jjr5TrHhAQGPfhL+ssy2/DyhiIJ0c5n+L76/P5 VD8= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 15 Apr 2021 20:05:35 -0700 From: Damien Le Moal To: dm-devel@redhat.com, Mike Snitzer , linux-block@vger.kernel.org, Jens Axboe , linux-nvme@lists.infradead.org, Christoph Hellwig , linux-scsi@vger.kernel.org, "Martin K . Petersen" , linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, David Sterba , Josef Bacik Cc: Johannes Thumshirn , Shinichiro Kawasaki , Naohiro Aota Subject: [PATCH 2/4] dm crypt: Fix zoned block device support Date: Fri, 16 Apr 2021 12:05:26 +0900 Message-Id: <20210416030528.757513-3-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210416030528.757513-1-damien.lemoal@wdc.com> References: <20210416030528.757513-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Zone append BIOs (REQ_OP_ZONE_APPEND) always specify the start sector of the zone to be written instead of the actual location sector to write. The write location is determined by the device and returned to the host upon completion of the operation. This interface, while simple and efficient for writing into sequential zones of a zoned block device, is incompatible with the use of sector values to calculate a cypher block IV. All data written in a zone end up using the same IV values corresponding to the first sectors of the zone, but read operation will specify any sector within the zone, resulting in an IV mismatch between encryption and decryption. Using a single sector value (e.g. the zone start sector) for all read and writes into a zone can solve this problem, but at the cost of weakening the cypher chosen by the user. Instead, to solve this problem, explicitly disable support for zone append operations using the zone_append_not_supported field of struct dm_target if the IV mode used is sector-based, that is for all IVs modes except null and random. The cypher flag CRYPT_IV_NO_SECTORS iis introduced to indicate that the cypher does not use sector values. This flag is set in crypt_ctr_ivmode() for the null and random IV modes and checked in crypt_ctr() to set to true zone_append_not_supported if CRYPT_IV_NO_SECTORS is not set for the chosen cypher. Reported-by: Shin'ichiro Kawasaki Signed-off-by: Damien Le Moal --- drivers/md/dm-crypt.c | 48 +++++++++++++++++++++++++++++++++++-------- 1 file changed, 39 insertions(+), 9 deletions(-) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index b0ab080f2567..0a44bc0ff960 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -137,6 +137,7 @@ enum cipher_flags { CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cipher */ CRYPT_IV_LARGE_SECTORS, /* Calculate IV from sector_size, not 512B sectors */ CRYPT_ENCRYPT_PREPROCESS, /* Must preprocess data for encryption (elephant) */ + CRYPT_IV_NO_SECTORS, /* IV calculation does not use sectors */ }; /* @@ -2750,9 +2751,10 @@ static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) } /* Choose ivmode, see comments at iv code. */ - if (ivmode == NULL) + if (ivmode == NULL) { cc->iv_gen_ops = NULL; - else if (strcmp(ivmode, "plain") == 0) + set_bit(CRYPT_IV_NO_SECTORS, &cc->cipher_flags); + } else if (strcmp(ivmode, "plain") == 0) cc->iv_gen_ops = &crypt_iv_plain_ops; else if (strcmp(ivmode, "plain64") == 0) cc->iv_gen_ops = &crypt_iv_plain64_ops; @@ -2762,9 +2764,10 @@ static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) cc->iv_gen_ops = &crypt_iv_essiv_ops; else if (strcmp(ivmode, "benbi") == 0) cc->iv_gen_ops = &crypt_iv_benbi_ops; - else if (strcmp(ivmode, "null") == 0) + else if (strcmp(ivmode, "null") == 0) { cc->iv_gen_ops = &crypt_iv_null_ops; - else if (strcmp(ivmode, "eboiv") == 0) + set_bit(CRYPT_IV_NO_SECTORS, &cc->cipher_flags); + } else if (strcmp(ivmode, "eboiv") == 0) cc->iv_gen_ops = &crypt_iv_eboiv_ops; else if (strcmp(ivmode, "elephant") == 0) { cc->iv_gen_ops = &crypt_iv_elephant_ops; @@ -2791,6 +2794,7 @@ static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; } else if (strcmp(ivmode, "random") == 0) { cc->iv_gen_ops = &crypt_iv_random_ops; + set_bit(CRYPT_IV_NO_SECTORS, &cc->cipher_flags); /* Need storage space in integrity fields. */ cc->integrity_iv_size = cc->iv_size; } else { @@ -3281,14 +3285,31 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) } cc->start = tmpll; - /* - * For zoned block devices, we need to preserve the issuer write - * ordering. To do so, disable write workqueues and force inline - * encryption completion. - */ if (bdev_is_zoned(cc->dev->bdev)) { + /* + * For zoned block devices, we need to preserve the issuer write + * ordering. To do so, disable write workqueues and force inline + * encryption completion. + */ set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags); set_bit(DM_CRYPT_WRITE_INLINE, &cc->flags); + + /* + * All zone append writes to a zone of a zoned block device will + * have the same BIO sector (the start of the zone). When the + * cypher IV mode uses sector values, all data targeting a + * zone will be encrypted using the first sector numbers of the + * zone. This will not result in write errors but will + * cause most reads to fail as reads will use the sector values + * for the actual data location, resulting in IV mismatch. + * To avoid this problem, allow zone append operations only for + * cyphers with an IV mode not using sector values (null and + * random IVs). + */ + if (!test_bit(CRYPT_IV_NO_SECTORS, &cc->cipher_flags)) { + DMWARN("Zone append is not supported with sector-based IV cyphers"); + ti->zone_append_not_supported = true; + } } if (crypt_integrity_aead(cc) || cc->integrity_iv_size) { @@ -3356,6 +3377,15 @@ static int crypt_map(struct dm_target *ti, struct bio *bio) struct dm_crypt_io *io; struct crypt_config *cc = ti->private; + /* + * For zoned targets using a sector based IV, zone append is not + * supported. We should not see any such operation in that case. + * In the unlikely case we do, warn and fail the request. + */ + if (WARN_ON_ONCE(bio_op(bio) == REQ_OP_ZONE_APPEND && + !test_bit(CRYPT_IV_NO_SECTORS, &cc->cipher_flags))) + return DM_MAPIO_KILL; + /* * If bio is REQ_PREFLUSH or REQ_OP_DISCARD, just bypass crypt queues. * - for REQ_PREFLUSH device-mapper core ensures that no IO is in-flight