From patchwork Tue Sep 5 12:38:52 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gilad Ben-Yossef X-Patchwork-Id: 9939085 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 81B8F6038C for ; Tue, 5 Sep 2017 13:50:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0052128A2C for ; Tue, 5 Sep 2017 13:50:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F22D3289F8; Tue, 5 Sep 2017 13:50:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B7D59289F7 for ; Tue, 5 Sep 2017 13:50:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=ek9Up4zqgPVkdzGS8poc6zJf9JgabcRwCbEQVPhQhdY=; b=B4g4z8OgG77BqwXAmoh0d8dzVV hyKTiZv/7I3WoNEyYuGw27kSxPe++jzIysV2cjaxsv+kXyfacZ6j4XDX/XXen4PEm93a1/tMbdh0Z kBdkAlP+opE8//7YbzKxaNbil1uI1QN7ZMFur0lft27zX5B6zTRolnPwYuEWh2K6zFbxRl5cIBC1l ZGRTDFsPIbRehiaK2HyAN7rn3tufLkvF5Pl0N0hOWBFIQdmVpt3688jC9C4pK9oowTUkphNb/NAuv 5/gkx5/86HgSfKBHY7Kl5IztJP8QmU+HFWdIsMRqv4w/9pPW2LqDTOVycpluLIfTfOdVaZrnw0CZ4 EOv1RMhA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dpEEq-0003Am-1d; Tue, 05 Sep 2017 13:50:00 +0000 Received: from merlin.infradead.org ([2001:8b0:10b:1231::1]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dpEEB-0002UD-EI; Tue, 05 Sep 2017 13:49:19 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=yokMHLubPS5KZ6QGU/qPdCFo/LRzdL2q+9BrKoLtAms=; b=cyQdBJansiaEX59KVC0r0wEQl 6Uym+N8teYsosX63AZngvvoIIOgWbykDV57UI0MzGPRvo3q/1WAkaEogx+Ch9XKLdqOMvXeVfjMXu Edc/WAkH/xyBkRdEAhbph7zPMi2J1z0OSOdBmD6rO/1yL3MCpCZwdaX67G+pL/OSi6Mv9wnfA4Z7o tBOVpujGNNuS4rqq8MnB2/4TYsTGSR2pyUkMGdfRgh2iFIOqJsCCrsUrDswFUYd1FN9w3TcjU9u1f yq/GFJgTve9lB+kXAWYQSDLa11bW400Faa7VpgNKgL4PhSOjygR1tQUV1HoLWWKDublp+GWT79YvN 0t9my65OA==; Received: from foss.arm.com ([217.140.101.70]) by merlin.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dpDBn-0003DI-Po; Tue, 05 Sep 2017 12:42:48 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 85824168F; Tue, 5 Sep 2017 05:42:30 -0700 (PDT) Received: from gby.kfn.arm.com (unknown [10.45.48.140]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 121EE3F3E1; Tue, 5 Sep 2017 05:42:20 -0700 (PDT) From: Gilad Ben-Yossef To: Herbert Xu , "David S. Miller" , Jonathan Corbet , David Howells , Tom Lendacky , Gary Hook , Boris Brezillon , Arnaud Ebalard , Matthias Brugger , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Shaohua Li , Steve French , "Theodore Y. Ts'o" , Jaegeuk Kim , Steffen Klassert , Alexey Kuznetsov , Hideaki YOSHIFUJI , Mimi Zohar , Dmitry Kasatkin , James Morris , "Serge E. Hallyn" , linux-crypto@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, keyrings@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-raid@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-fscrypt@vger.kernel.org, netdev@vger.kernel.org, linux-ima-devel@lists.sourceforge.net, linux-ima-user@lists.sourceforge.net, linux-security-module@vger.kernel.org Subject: [PATCH v8 13/20] dm: move dm-verity to generic async completion Date: Tue, 5 Sep 2017 15:38:52 +0300 Message-Id: <1504615144-29770-14-git-send-email-gilad@benyossef.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1504615144-29770-1-git-send-email-gilad@benyossef.com> References: <1504615144-29770-1-git-send-email-gilad@benyossef.com> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mikulas Patocka , Ofir Drang MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP dm-verity is starting async. crypto ops and waiting for them to complete. Move it over to generic code doing the same. This also avoids a future potential data coruption bug created by the use of wait_for_completion_interruptible() without dealing correctly with an interrupt aborting the wait prior to the async op finishing, should this code ever move to a context where signals are not masked. Signed-off-by: Gilad Ben-Yossef CC: Mikulas Patocka --- drivers/md/dm-verity-target.c | 81 +++++++++++-------------------------------- drivers/md/dm-verity.h | 5 --- 2 files changed, 20 insertions(+), 66 deletions(-) diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c index bda3cac..811ad28 100644 --- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -92,74 +92,33 @@ static sector_t verity_position_at_level(struct dm_verity *v, sector_t block, return block >> (level * v->hash_per_block_bits); } -/* - * Callback function for asynchrnous crypto API completion notification - */ -static void verity_op_done(struct crypto_async_request *base, int err) -{ - struct verity_result *res = (struct verity_result *)base->data; - - if (err == -EINPROGRESS) - return; - - res->err = err; - complete(&res->completion); -} - -/* - * Wait for async crypto API callback - */ -static inline int verity_complete_op(struct verity_result *res, int ret) -{ - switch (ret) { - case 0: - break; - - case -EINPROGRESS: - case -EBUSY: - ret = wait_for_completion_interruptible(&res->completion); - if (!ret) - ret = res->err; - reinit_completion(&res->completion); - break; - - default: - DMERR("verity_wait_hash: crypto op submission failed: %d", ret); - } - - if (unlikely(ret < 0)) - DMERR("verity_wait_hash: crypto op failed: %d", ret); - - return ret; -} - static int verity_hash_update(struct dm_verity *v, struct ahash_request *req, const u8 *data, size_t len, - struct verity_result *res) + struct crypto_wait *wait) { struct scatterlist sg; sg_init_one(&sg, data, len); ahash_request_set_crypt(req, &sg, NULL, len); - return verity_complete_op(res, crypto_ahash_update(req)); + return crypto_wait_req(crypto_ahash_update(req), wait); } /* * Wrapper for crypto_ahash_init, which handles verity salting. */ static int verity_hash_init(struct dm_verity *v, struct ahash_request *req, - struct verity_result *res) + struct crypto_wait *wait) { int r; ahash_request_set_tfm(req, v->tfm); ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP | CRYPTO_TFM_REQ_MAY_BACKLOG, - verity_op_done, (void *)res); - init_completion(&res->completion); + crypto_req_done, (void *)wait); + crypto_init_wait(wait); - r = verity_complete_op(res, crypto_ahash_init(req)); + r = crypto_wait_req(crypto_ahash_init(req), wait); if (unlikely(r < 0)) { DMERR("crypto_ahash_init failed: %d", r); @@ -167,18 +126,18 @@ static int verity_hash_init(struct dm_verity *v, struct ahash_request *req, } if (likely(v->salt_size && (v->version >= 1))) - r = verity_hash_update(v, req, v->salt, v->salt_size, res); + r = verity_hash_update(v, req, v->salt, v->salt_size, wait); return r; } static int verity_hash_final(struct dm_verity *v, struct ahash_request *req, - u8 *digest, struct verity_result *res) + u8 *digest, struct crypto_wait *wait) { int r; if (unlikely(v->salt_size && (!v->version))) { - r = verity_hash_update(v, req, v->salt, v->salt_size, res); + r = verity_hash_update(v, req, v->salt, v->salt_size, wait); if (r < 0) { DMERR("verity_hash_final failed updating salt: %d", r); @@ -187,7 +146,7 @@ static int verity_hash_final(struct dm_verity *v, struct ahash_request *req, } ahash_request_set_crypt(req, NULL, digest, 0); - r = verity_complete_op(res, crypto_ahash_final(req)); + r = crypto_wait_req(crypto_ahash_final(req), wait); out: return r; } @@ -196,17 +155,17 @@ int verity_hash(struct dm_verity *v, struct ahash_request *req, const u8 *data, size_t len, u8 *digest) { int r; - struct verity_result res; + struct crypto_wait wait; - r = verity_hash_init(v, req, &res); + r = verity_hash_init(v, req, &wait); if (unlikely(r < 0)) goto out; - r = verity_hash_update(v, req, data, len, &res); + r = verity_hash_update(v, req, data, len, &wait); if (unlikely(r < 0)) goto out; - r = verity_hash_final(v, req, digest, &res); + r = verity_hash_final(v, req, digest, &wait); out: return r; @@ -389,7 +348,7 @@ int verity_hash_for_block(struct dm_verity *v, struct dm_verity_io *io, * Calculates the digest for the given bio */ int verity_for_io_block(struct dm_verity *v, struct dm_verity_io *io, - struct bvec_iter *iter, struct verity_result *res) + struct bvec_iter *iter, struct crypto_wait *wait) { unsigned int todo = 1 << v->data_dev_block_bits; struct bio *bio = dm_bio_from_per_bio_data(io, v->ti->per_io_data_size); @@ -414,7 +373,7 @@ int verity_for_io_block(struct dm_verity *v, struct dm_verity_io *io, */ sg_set_page(&sg, bv.bv_page, len, bv.bv_offset); ahash_request_set_crypt(req, &sg, NULL, len); - r = verity_complete_op(res, crypto_ahash_update(req)); + r = crypto_wait_req(crypto_ahash_update(req), wait); if (unlikely(r < 0)) { DMERR("verity_for_io_block crypto op failed: %d", r); @@ -482,7 +441,7 @@ static int verity_verify_io(struct dm_verity_io *io) struct dm_verity *v = io->v; struct bvec_iter start; unsigned b; - struct verity_result res; + struct crypto_wait wait; for (b = 0; b < io->n_blocks; b++) { int r; @@ -507,17 +466,17 @@ static int verity_verify_io(struct dm_verity_io *io) continue; } - r = verity_hash_init(v, req, &res); + r = verity_hash_init(v, req, &wait); if (unlikely(r < 0)) return r; start = io->iter; - r = verity_for_io_block(v, io, &io->iter, &res); + r = verity_for_io_block(v, io, &io->iter, &wait); if (unlikely(r < 0)) return r; r = verity_hash_final(v, req, verity_io_real_digest(v, io), - &res); + &wait); if (unlikely(r < 0)) return r; diff --git a/drivers/md/dm-verity.h b/drivers/md/dm-verity.h index a59e0ad..b675bc0 100644 --- a/drivers/md/dm-verity.h +++ b/drivers/md/dm-verity.h @@ -90,11 +90,6 @@ struct dm_verity_io { */ }; -struct verity_result { - struct completion completion; - int err; -}; - static inline struct ahash_request *verity_io_hash_req(struct dm_verity *v, struct dm_verity_io *io) {