From patchwork Mon Aug 12 14:53:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 11090025 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 28EDB1399 for ; Mon, 12 Aug 2019 14:53:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 19C4D28437 for ; Mon, 12 Aug 2019 14:53:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0E0B428448; Mon, 12 Aug 2019 14:53:57 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham 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 A090B2843B for ; Mon, 12 Aug 2019 14:53:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727068AbfHLOx4 (ORCPT ); Mon, 12 Aug 2019 10:53:56 -0400 Received: from mail-wm1-f68.google.com ([209.85.128.68]:53576 "EHLO mail-wm1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727037AbfHLOx4 (ORCPT ); Mon, 12 Aug 2019 10:53:56 -0400 Received: by mail-wm1-f68.google.com with SMTP id 10so12458509wmp.3 for ; Mon, 12 Aug 2019 07:53:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=RPAXMF1cZCQBFyoO5A8Rg5Pyb4a0kwaVK9Utdlrc6bw=; b=HPd1I4UgBWiDtrDqP8Ibwq0bukCpSgD2COS1aF+OJautrHGb22YSz6iSzyREDD7/iU +8RHZSigttoAcV4j0A4x0NPM2Gc1eVLwnNdLZGqNXz7k55tir9Vfeebrn6byVb8fssmB aJt8sE3BGLbxRpw8XzNRSg9dwjt/faluQIM2oRa2YTLYpQS6yUF7c6TWGeMvQIOG6WV5 EhxcX7W8sbfoE5+fOdz9xTut4arwIvhboa21yo1QN94hYf2Js7Mp8avqzVpvvz6GdP+H HmLGftm+HF6lDkAyS2bLhdetY9nz6kMccX0ZGOmYvwj1JHnX8dRCGCrcYIqn3rfqdROg RbGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=RPAXMF1cZCQBFyoO5A8Rg5Pyb4a0kwaVK9Utdlrc6bw=; b=LbAtiEEUg9HND0z0rMQcxEX2li+PlNznpBfiZs6QN7UVbcTUdzPRGPJgBUrK7YZO0u 560zmWiiYnITL7GK4ltFgxFVwnvKvWVqyY9WfzbWqowc9OZUrL90z48wHZKqyPs+116G 4TllgwG0Wjfl+eZKEJl2MAPBlZMshVD0mwlNwwiGJDuMULstegYItvDhvLGl1FyNBANM 5AJsj4uTwCNu8zbfztTw3MvPLnts1S/+WmEtLoHtwNNBRNrFaJ31xU1WQ2fbhvfFHz0S Sj8H4btKh88FZbIwRXmLWiYPIEkJ/pEs+ZMThoh36nfXyVGwl13nmbP/pLvqmQKzn/TZ lsxA== X-Gm-Message-State: APjAAAUmW9bGGN26+MrDYWDF3/7F38eumJW2XGPkmfVL+AlJotQ8GTrD rJgLe+NdTAbaqs23WRfd9UiVRg== X-Google-Smtp-Source: APXvYqzsX9jGCzgbY3nph2SZ/NkCZDR8QVdOrP8Q0upsnGNRaqynD6WofTQaCwEM5IwdsBMfLcLCcQ== X-Received: by 2002:a1c:760b:: with SMTP id r11mr28955527wmc.41.1565621634015; Mon, 12 Aug 2019 07:53:54 -0700 (PDT) Received: from localhost.localdomain ([2a02:587:a407:da00:1c0e:f938:89a1:8e17]) by smtp.gmail.com with ESMTPSA id k13sm23369190wro.97.2019.08.12.07.53.52 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Aug 2019 07:53:53 -0700 (PDT) From: Ard Biesheuvel To: linux-crypto@vger.kernel.org Cc: Ard Biesheuvel , Herbert Xu , Eric Biggers , dm-devel@redhat.com, linux-fscrypt@vger.kernel.org, Gilad Ben-Yossef , Milan Broz Subject: [PATCH v10 7/7] md: dm-crypt: omit parsing of the encapsulated cipher Date: Mon, 12 Aug 2019 17:53:24 +0300 Message-Id: <20190812145324.27090-8-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190812145324.27090-1-ard.biesheuvel@linaro.org> References: <20190812145324.27090-1-ard.biesheuvel@linaro.org> Sender: linux-fscrypt-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Only the ESSIV IV generation mode used to use cc->cipher so it could instantiate the bare cipher used to encrypt the IV. However, this is now taken care of by the ESSIV template, and so no users of cc->cipher remain. So remove it altogether. Signed-off-by: Ard Biesheuvel --- drivers/md/dm-crypt.c | 58 -------------------- 1 file changed, 58 deletions(-) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index d44d24853aee..f87f6495652f 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -143,7 +143,6 @@ struct crypt_config { struct task_struct *write_thread; struct rb_root write_tree; - char *cipher; char *cipher_string; char *cipher_auth; char *key_string; @@ -2140,7 +2139,6 @@ static void crypt_dtr(struct dm_target *ti) if (cc->dev) dm_put_device(ti, cc->dev); - kzfree(cc->cipher); kzfree(cc->cipher_string); kzfree(cc->key_string); kzfree(cc->cipher_auth); @@ -2221,52 +2219,6 @@ static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode) return 0; } -/* - * Workaround to parse cipher algorithm from crypto API spec. - * The cc->cipher is currently used only in ESSIV. - * This should be probably done by crypto-api calls (once available...) - */ -static int crypt_ctr_blkdev_cipher(struct crypt_config *cc) -{ - const char *alg_name = NULL; - char *start, *end; - - if (crypt_integrity_aead(cc)) { - alg_name = crypto_tfm_alg_name(crypto_aead_tfm(any_tfm_aead(cc))); - if (!alg_name) - return -EINVAL; - if (crypt_integrity_hmac(cc)) { - alg_name = strchr(alg_name, ','); - if (!alg_name) - return -EINVAL; - } - alg_name++; - } else { - alg_name = crypto_tfm_alg_name(crypto_skcipher_tfm(any_tfm(cc))); - if (!alg_name) - return -EINVAL; - } - - start = strchr(alg_name, '('); - end = strchr(alg_name, ')'); - - if (!start && !end) { - cc->cipher = kstrdup(alg_name, GFP_KERNEL); - return cc->cipher ? 0 : -ENOMEM; - } - - if (!start || !end || ++start >= end) - return -EINVAL; - - cc->cipher = kzalloc(end - start + 1, GFP_KERNEL); - if (!cc->cipher) - return -ENOMEM; - - strncpy(cc->cipher, start, end - start); - - return 0; -} - /* * Workaround to parse HMAC algorithm from AEAD crypto API spec. * The HMAC is needed to calculate tag size (HMAC digest size). @@ -2376,12 +2328,6 @@ static int crypt_ctr_cipher_new(struct dm_target *ti, char *cipher_in, char *key else cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); - ret = crypt_ctr_blkdev_cipher(cc); - if (ret < 0) { - ti->error = "Cannot allocate cipher string"; - return -ENOMEM; - } - return 0; } @@ -2416,10 +2362,6 @@ static int crypt_ctr_cipher_old(struct dm_target *ti, char *cipher_in, char *key } cc->key_parts = cc->tfms_count; - cc->cipher = kstrdup(cipher, GFP_KERNEL); - if (!cc->cipher) - goto bad_mem; - chainmode = strsep(&tmp, "-"); *ivmode = strsep(&tmp, ":"); *ivopts = tmp;