From patchwork Tue Oct 10 20:40:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josef Bacik X-Patchwork-Id: 13416104 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2C8D5CD68E9 for ; Tue, 10 Oct 2023 20:41:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234654AbjJJUlZ (ORCPT ); Tue, 10 Oct 2023 16:41:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234614AbjJJUlO (ORCPT ); Tue, 10 Oct 2023 16:41:14 -0400 Received: from mail-yw1-x1134.google.com (mail-yw1-x1134.google.com [IPv6:2607:f8b0:4864:20::1134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2744AD3 for ; Tue, 10 Oct 2023 13:41:11 -0700 (PDT) Received: by mail-yw1-x1134.google.com with SMTP id 00721157ae682-5a7ad24b3aaso22705377b3.2 for ; Tue, 10 Oct 2023 13:41:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=toxicpanda-com.20230601.gappssmtp.com; s=20230601; t=1696970470; x=1697575270; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=3m4RAmLF+khaONHXt5qu//wFJJoUrRtGots1ic/eLAI=; b=WjfFi+gH5h5K1Rxx88fOl7il7cMo1NwVuHfhNO9uPV/j+y2+ahEQd4RjsgDL5154by RWeE+SibHed/VdWh/hho6I2YbWoyMVip28dIWPKHu174IYo2U/+z21MrZwuqWYp4EiVg 05Rr5czj4m+0KvVdJNfMUxT/xH0VzgKoO4r5Zr0oFpRAh1yTgNU/Sx6wZMAlDhODlFpc n8/5xsl5LbO18JHqI41LT3qyyoAXaOafyCKF0uktkzV3+rjU1VHgVQlcFXqflpZQgTve ICJTARlqXYiGTJ8mgVrXIKI3jGRY/Ez4M1a0ITVB/tuX9nyC2U/aL3mv6UCdLu2Wy32C bxIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696970470; x=1697575270; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=3m4RAmLF+khaONHXt5qu//wFJJoUrRtGots1ic/eLAI=; b=KNXsLdwbEI3JC12gYLo4+Hw+jmDBt02f+Zu2IMXprTv7lcyBM9UqSyAgC9Gq1SjIjh Ol82Jy7CU1jXjctLMSHy/tZU0s8sHpDtc3pmSE1XrFckUDIEtQs+ZVQuZTcgZ9llGXB1 WBOCWHIeMOeiwHVh+kGN8hOza4lcMe/bBnlPsoyBOScfNdTnHxutuiz10fjiwdxb0AX5 jD+o/4JvPXiVPDXlgmUM7nPWtPmOaRYj92H7AaYq30R0bvFRyed4IhH4ulCfGR8IwzyB 54zwyML7TgEx5m8tk1HTOkdO86mfd4GCqDOGBAL1xz6z5vWBch6LOsCZ97XHAVT83RYz S6oQ== X-Gm-Message-State: AOJu0Yz+9GvnG1OMmg/Ami2gWM3vdKozCkxpXGpgtp7aUmQmHv9mKWB1 NPUh6OpcRwEzG35A5x7X3uErQy8EDWBbxkIGoO1M9A== X-Google-Smtp-Source: AGHT+IEouGSIjN904f72tEDHIxSSZumqXFfqa+Z9ibdW067FA51KO6BL+bO0SLL2rzK/kWN9sdei7g== X-Received: by 2002:a81:4e4a:0:b0:5a7:ca59:82b9 with SMTP id c71-20020a814e4a000000b005a7ca5982b9mr2301640ywb.16.1696970470319; Tue, 10 Oct 2023 13:41:10 -0700 (PDT) Received: from localhost (cpe-76-182-20-124.nc.res.rr.com. [76.182.20.124]) by smtp.gmail.com with ESMTPSA id n184-20020a0de4c1000000b005a4d922cf77sm4656731ywe.119.2023.10.10.13.41.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Oct 2023 13:41:09 -0700 (PDT) From: Josef Bacik To: linux-fscrypt@vger.kernel.org, ebiggers@kernel.org, linux-btrfs@vger.kernel.org Subject: [PATCH v2 05/36] blk-crypto: add a process bio callback Date: Tue, 10 Oct 2023 16:40:20 -0400 Message-ID: X-Mailer: git-send-email 2.41.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Btrfs does checksumming, and the checksums need to match the bytes on disk. In order to facilitate this add a process bio callback for the blk-crypto layer. This allows the file system to specify a callback and then can process the encrypted bio as necessary. For btrfs, writes will have the checksums calculated and saved into our relevant data structures for storage once the write completes. For reads we will validate the checksums match what is on disk and error out if there is a mismatch. This is incompatible with native encryption obviously, so make sure we don't use native encryption if this callback is set. Signed-off-by: Josef Bacik --- block/blk-crypto-fallback.c | 28 ++++++++++++++++++++++++++++ block/blk-crypto-profile.c | 2 ++ block/blk-crypto.c | 6 +++++- fs/crypto/inline_crypt.c | 3 ++- include/linux/blk-crypto-profile.h | 7 +++++++ include/linux/blk-crypto.h | 9 +++++++-- include/linux/fscrypt.h | 14 ++++++++++++++ 7 files changed, 65 insertions(+), 4 deletions(-) diff --git a/block/blk-crypto-fallback.c b/block/blk-crypto-fallback.c index e6468eab2681..8b4a83534127 100644 --- a/block/blk-crypto-fallback.c +++ b/block/blk-crypto-fallback.c @@ -346,6 +346,15 @@ static bool blk_crypto_fallback_encrypt_bio(struct bio **bio_ptr) } } + /* Process the encrypted bio before we submit it. */ + if (bc->bc_key->crypto_cfg.process_bio) { + blk_st = bc->bc_key->crypto_cfg.process_bio(src_bio, enc_bio); + if (blk_st != BLK_STS_OK) { + src_bio->bi_status = blk_st; + goto out_free_bounce_pages; + } + } + enc_bio->bi_private = src_bio; enc_bio->bi_end_io = blk_crypto_fallback_encrypt_endio; *bio_ptr = enc_bio; @@ -391,6 +400,24 @@ static void blk_crypto_fallback_decrypt_bio(struct work_struct *work) unsigned int i; blk_status_t blk_st; + /* + * Process the bio first before trying to decrypt. + * + * NOTE: btrfs expects that this bio is the same that was submitted. If + * at any point this changes we will need to update process_bio to take + * f_ctx->crypt_iter in order to make sure we can iterate the pages for + * checksumming. We're currently saving this in our btrfs_bio, so this + * works, but if at any point in the future we start allocating a bounce + * bio or something we need to update this callback. + */ + if (bc->bc_key->crypto_cfg.process_bio) { + blk_st = bc->bc_key->crypto_cfg.process_bio(bio, bio); + if (blk_st != BLK_STS_OK) { + bio->bi_status = blk_st; + goto out_no_keyslot; + } + } + /* * Get a blk-crypto-fallback keyslot that contains a crypto_skcipher for * this bio's algorithm and key. @@ -560,6 +587,7 @@ static int blk_crypto_fallback_init(void) blk_crypto_fallback_profile->ll_ops = blk_crypto_fallback_ll_ops; blk_crypto_fallback_profile->max_dun_bytes_supported = BLK_CRYPTO_MAX_IV_SIZE; + blk_crypto_fallback_profile->process_bio_supported = true; /* All blk-crypto modes have a crypto API fallback. */ for (i = 0; i < BLK_ENCRYPTION_MODE_MAX; i++) diff --git a/block/blk-crypto-profile.c b/block/blk-crypto-profile.c index 7fabc883e39f..640cf2ea3fcc 100644 --- a/block/blk-crypto-profile.c +++ b/block/blk-crypto-profile.c @@ -352,6 +352,8 @@ bool __blk_crypto_cfg_supported(struct blk_crypto_profile *profile, return false; if (profile->max_dun_bytes_supported < cfg->dun_bytes) return false; + if (cfg->process_bio && !profile->process_bio_supported) + return false; return true; } diff --git a/block/blk-crypto.c b/block/blk-crypto.c index 4d760b092deb..50556952df19 100644 --- a/block/blk-crypto.c +++ b/block/blk-crypto.c @@ -321,6 +321,8 @@ int __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio, * @dun_bytes: number of bytes that will be used to specify the DUN when this * key is used * @data_unit_size: the data unit size to use for en/decryption + * @process_bio: the call back if the upper layer needs to process the encrypted + * bio * * Return: 0 on success, -errno on failure. The caller is responsible for * zeroizing both blk_key and raw_key when done with them. @@ -328,7 +330,8 @@ int __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio, int blk_crypto_init_key(struct blk_crypto_key *blk_key, const u8 *raw_key, enum blk_crypto_mode_num crypto_mode, unsigned int dun_bytes, - unsigned int data_unit_size) + unsigned int data_unit_size, + blk_crypto_process_bio_t process_bio) { const struct blk_crypto_mode *mode; @@ -350,6 +353,7 @@ int blk_crypto_init_key(struct blk_crypto_key *blk_key, const u8 *raw_key, blk_key->crypto_cfg.crypto_mode = crypto_mode; blk_key->crypto_cfg.dun_bytes = dun_bytes; blk_key->crypto_cfg.data_unit_size = data_unit_size; + blk_key->crypto_cfg.process_bio = process_bio; blk_key->data_unit_size_bits = ilog2(data_unit_size); blk_key->size = mode->keysize; memcpy(blk_key->raw, raw_key, mode->keysize); diff --git a/fs/crypto/inline_crypt.c b/fs/crypto/inline_crypt.c index 4eeb75410ba8..57776c548a06 100644 --- a/fs/crypto/inline_crypt.c +++ b/fs/crypto/inline_crypt.c @@ -168,7 +168,8 @@ int fscrypt_prepare_inline_crypt_key(struct fscrypt_prepared_key *prep_key, err = blk_crypto_init_key(blk_key, raw_key, crypto_mode, fscrypt_get_dun_bytes(ci), - 1U << ci->ci_data_unit_bits); + 1U << ci->ci_data_unit_bits, + sb->s_cop->process_bio); if (err) { fscrypt_err(inode, "error %d initializing blk-crypto key", err); goto fail; diff --git a/include/linux/blk-crypto-profile.h b/include/linux/blk-crypto-profile.h index 90ab33cb5d0e..3c002e85631a 100644 --- a/include/linux/blk-crypto-profile.h +++ b/include/linux/blk-crypto-profile.h @@ -100,6 +100,13 @@ struct blk_crypto_profile { */ struct device *dev; + /** + * @process_bio_supported: Some things, like btrfs, require the + * encrypted data for checksumming. Drivers set this to true if they can + * handle the process_bio() callback. + */ + bool process_bio_supported; + /* private: The following fields shouldn't be accessed by drivers. */ /* Number of keyslots, or 0 if not applicable */ diff --git a/include/linux/blk-crypto.h b/include/linux/blk-crypto.h index 5e5822c18ee4..194c1d727013 100644 --- a/include/linux/blk-crypto.h +++ b/include/linux/blk-crypto.h @@ -6,7 +6,7 @@ #ifndef __LINUX_BLK_CRYPTO_H #define __LINUX_BLK_CRYPTO_H -#include +#include enum blk_crypto_mode_num { BLK_ENCRYPTION_MODE_INVALID, @@ -17,6 +17,9 @@ enum blk_crypto_mode_num { BLK_ENCRYPTION_MODE_MAX, }; +typedef blk_status_t (blk_crypto_process_bio_t)(struct bio *orig_bio, + struct bio *enc_bio); + #define BLK_CRYPTO_MAX_KEY_SIZE 64 /** * struct blk_crypto_config - an inline encryption key's crypto configuration @@ -31,6 +34,7 @@ struct blk_crypto_config { enum blk_crypto_mode_num crypto_mode; unsigned int data_unit_size; unsigned int dun_bytes; + blk_crypto_process_bio_t *process_bio; }; /** @@ -90,7 +94,8 @@ bool bio_crypt_dun_is_contiguous(const struct bio_crypt_ctx *bc, int blk_crypto_init_key(struct blk_crypto_key *blk_key, const u8 *raw_key, enum blk_crypto_mode_num crypto_mode, unsigned int dun_bytes, - unsigned int data_unit_size); + unsigned int data_unit_size, + blk_crypto_process_bio_t process_bio); int blk_crypto_start_using_key(struct block_device *bdev, const struct blk_crypto_key *key); diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h index ea8fdc6f3b83..a3576da6a9fa 100644 --- a/include/linux/fscrypt.h +++ b/include/linux/fscrypt.h @@ -16,6 +16,7 @@ #include #include #include +#include #include /* @@ -199,6 +200,19 @@ struct fscrypt_operations { */ struct block_device **(*get_devices)(struct super_block *sb, unsigned int *num_devs); + + /* + * A callback if the file system requires the ability to process the + * encrypted bio. + * + * @orig_bio: the original bio submitted. + * @enc_bio: the encrypted bio. + * + * For writes the enc_bio will be different from the orig_bio, for reads + * they will be the same. For reads we get the bio before it is + * decrypted, for writes we get the bio before it is submitted. + */ + blk_crypto_process_bio_t *process_bio; }; static inline struct fscrypt_inode_info *