From patchwork Thu Aug 24 14:18:55 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: 9920341 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 32159603FA for ; Thu, 24 Aug 2017 14:28:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 26B7428643 for ; Thu, 24 Aug 2017 14:28:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1B4152898D; Thu, 24 Aug 2017 14:28:21 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B9D2A28927 for ; Thu, 24 Aug 2017 14:28:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753012AbdHXOVK (ORCPT ); Thu, 24 Aug 2017 10:21:10 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:41968 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751352AbdHXOVG (ORCPT ); Thu, 24 Aug 2017 10:21:06 -0400 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 614401713; Thu, 24 Aug 2017 07:21:06 -0700 (PDT) Received: from gby.kfn.arm.com (unknown [10.45.48.132]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6CF593F540; Thu, 24 Aug 2017 07:20:58 -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 , 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, linux-ima-devel@lists.sourceforge.net, linux-ima-user@lists.sourceforge.net, linux-security-module@vger.kernel.org Cc: Ofir Drang Subject: [PATCH v7 08/19] crypto: move drbg to generic async completion Date: Thu, 24 Aug 2017 17:18:55 +0300 Message-Id: <1503584350-7831-9-git-send-email-gilad@benyossef.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1503584350-7831-1-git-send-email-gilad@benyossef.com> References: <1503584350-7831-1-git-send-email-gilad@benyossef.com> Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP DRBG is starting an async. crypto op and waiting for it complete. Move it over to generic code doing the same. The code now also passes CRYPTO_TFM_REQ_MAY_SLEEP flag indicating crypto request memory allocation may use GFP_KERNEL which should be perfectly fine as the code is obviously sleeping for the completion of the request any way. Signed-off-by: Gilad Ben-Yossef --- crypto/drbg.c | 36 +++++++++--------------------------- include/crypto/drbg.h | 3 +-- 2 files changed, 10 insertions(+), 29 deletions(-) diff --git a/crypto/drbg.c b/crypto/drbg.c index 633a88e..c522251 100644 --- a/crypto/drbg.c +++ b/crypto/drbg.c @@ -1651,16 +1651,6 @@ static int drbg_fini_sym_kernel(struct drbg_state *drbg) return 0; } -static void drbg_skcipher_cb(struct crypto_async_request *req, int error) -{ - struct drbg_state *drbg = req->data; - - if (error == -EINPROGRESS) - return; - drbg->ctr_async_err = error; - complete(&drbg->ctr_completion); -} - static int drbg_init_sym_kernel(struct drbg_state *drbg) { struct crypto_cipher *tfm; @@ -1691,7 +1681,7 @@ static int drbg_init_sym_kernel(struct drbg_state *drbg) return PTR_ERR(sk_tfm); } drbg->ctr_handle = sk_tfm; - init_completion(&drbg->ctr_completion); + crypto_init_wait(&drbg->ctr_wait); req = skcipher_request_alloc(sk_tfm, GFP_KERNEL); if (!req) { @@ -1700,8 +1690,9 @@ static int drbg_init_sym_kernel(struct drbg_state *drbg) return -ENOMEM; } drbg->ctr_req = req; - skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, - drbg_skcipher_cb, drbg); + skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG | + CRYPTO_TFM_REQ_MAY_SLEEP, + crypto_req_done, &drbg->ctr_wait); alignmask = crypto_skcipher_alignmask(sk_tfm); drbg->ctr_null_value_buf = kzalloc(DRBG_CTR_NULL_LEN + alignmask, @@ -1762,21 +1753,12 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg, /* Output buffer may not be valid for SGL, use scratchpad */ skcipher_request_set_crypt(drbg->ctr_req, &sg_in, &sg_out, cryptlen, drbg->V); - ret = crypto_skcipher_encrypt(drbg->ctr_req); - switch (ret) { - case 0: - break; - case -EINPROGRESS: - case -EBUSY: - wait_for_completion(&drbg->ctr_completion); - if (!drbg->ctr_async_err) { - reinit_completion(&drbg->ctr_completion); - break; - } - default: + ret = crypto_wait_req(crypto_skcipher_encrypt(drbg->ctr_req), + &drbg->ctr_wait); + if (ret) goto out; - } - init_completion(&drbg->ctr_completion); + + crypto_init_wait(&drbg->ctr_wait); memcpy(outbuf, drbg->outscratchpad, cryptlen); diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h index 22f884c..8f94110 100644 --- a/include/crypto/drbg.h +++ b/include/crypto/drbg.h @@ -126,8 +126,7 @@ struct drbg_state { __u8 *ctr_null_value; /* CTR mode aligned zero buf */ __u8 *outscratchpadbuf; /* CTR mode output scratchpad */ __u8 *outscratchpad; /* CTR mode aligned outbuf */ - struct completion ctr_completion; /* CTR mode async handler */ - int ctr_async_err; /* CTR mode async error */ + struct crypto_wait ctr_wait; /* CTR mode async wait obj */ bool seeded; /* DRBG fully seeded? */ bool pr; /* Prediction resistance enabled? */