From patchwork Sun Jul 9 18:53:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sweet Tea Dorminy X-Patchwork-Id: 13306039 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 14391C001DF for ; Sun, 9 Jul 2023 18:53:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229897AbjGISx5 (ORCPT ); Sun, 9 Jul 2023 14:53:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57778 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229591AbjGISx4 (ORCPT ); Sun, 9 Jul 2023 14:53:56 -0400 Received: from box.fidei.email (box.fidei.email [IPv6:2605:2700:0:2:a800:ff:feba:dc44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F35310C; Sun, 9 Jul 2023 11:53:55 -0700 (PDT) Received: from authenticated-user (box.fidei.email [71.19.144.250]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by box.fidei.email (Postfix) with ESMTPSA id D5BD180AE0; Sun, 9 Jul 2023 14:53:54 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=dorminy.me; s=mail; t=1688928835; bh=jXmrDmv3a7aTd01El8w2YfMBqiBFTTnMgI7Hit+aCqI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KG/vxxeF0Y+wea7FTs1nYiscU3x2p105S71zdBOrb9d0JyBgOP7Bbs2WwbkFBJHE8 46KZlA0hQDFRHcdcBezFosjRoKXf+Z+OduWNRYUi2bHMDrzHGOp2krhn5ppobAB+Lg Pjt1qB+0s9VeWwoAsD/8XQjnp1u1bAr1btugB+Tg054AIaj1v2z9APV7KcUligjhd7 4RVPzo6w/Va5PGOQqBcJBi5sjL0VE5EtkYsNNHsUisy8mixeuyI7sL1vpP/upnkFlJ DWEaKoPRYtCXw0kwuBi23UmZaWpGaMJrDtQH+JT/g/uRhwJbKohO35cvKChXVINJd+ V6PCcy4pL2MCQ== From: Sweet Tea Dorminy To: "Theodore Y. Ts'o" , Jaegeuk Kim , Eric Biggers , Chris Mason , Josef Bacik , David Sterba , linux-fscrypt@vger.kernel.org, linux-btrfs@vger.kernel.org, kernel-team@meta.com Cc: Sweet Tea Dorminy Subject: [PATCH v2 03/14] fscrypt: adjust effective lblks based on extents Date: Sun, 9 Jul 2023 14:53:36 -0400 Message-Id: In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org If a filesystem uses extent-based encryption, then the offset within a file is not a constant which can be used for calculating an IV. For instance, the same extent could be blocks 0-8 in one file, and blocks 100-108 in another file. Instead, the block offset within the extent must be used instead. Update all uses of logical block offset within the file to use logical block offset within the extent, if applicable. Signed-off-by: Sweet Tea Dorminy --- fs/crypto/crypto.c | 3 ++- fs/crypto/inline_crypt.c | 24 +++++++++++++++++------- 2 files changed, 19 insertions(+), 8 deletions(-) diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c index 1b7e375b1c6b..d75f1b3f5795 100644 --- a/fs/crypto/crypto.c +++ b/fs/crypto/crypto.c @@ -107,8 +107,9 @@ int fscrypt_crypt_block(const struct inode *inode, fscrypt_direction_t rw, struct skcipher_request *req = NULL; DECLARE_CRYPTO_WAIT(wait); struct scatterlist dst, src; + u64 ci_offset = 0; struct fscrypt_info *ci = - fscrypt_get_lblk_info(inode, lblk_num, NULL, NULL); + fscrypt_get_lblk_info(inode, lblk_num, &ci_offset, NULL); struct crypto_skcipher *tfm = ci->ci_enc_key->tfm; int res = 0; diff --git a/fs/crypto/inline_crypt.c b/fs/crypto/inline_crypt.c index 885a2ec3d711..b3e7a5291d22 100644 --- a/fs/crypto/inline_crypt.c +++ b/fs/crypto/inline_crypt.c @@ -267,12 +267,15 @@ void fscrypt_set_bio_crypt_ctx(struct bio *bio, const struct inode *inode, { const struct fscrypt_info *ci; u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE]; + u64 ci_offset = 0; if (!fscrypt_inode_uses_inline_crypto(inode)) return; - ci = fscrypt_get_lblk_info(inode, first_lblk, NULL, NULL); + ci = fscrypt_get_lblk_info(inode, first_lblk, &ci_offset, NULL); + if (!ci) + return; - fscrypt_generate_dun(ci, first_lblk, dun); + fscrypt_generate_dun(ci, ci_offset, dun); bio_crypt_set_ctx(bio, ci->ci_enc_key->blk_key, dun, gfp_mask); } EXPORT_SYMBOL_GPL(fscrypt_set_bio_crypt_ctx); @@ -350,22 +353,23 @@ bool fscrypt_mergeable_bio(struct bio *bio, const struct inode *inode, const struct bio_crypt_ctx *bc = bio->bi_crypt_context; u64 next_dun[BLK_CRYPTO_DUN_ARRAY_SIZE]; struct fscrypt_info *ci; + u64 ci_offset = 0; if (!!bc != fscrypt_inode_uses_inline_crypto(inode)) return false; if (!bc) return true; - ci = fscrypt_get_lblk_info(inode, next_lblk, NULL, NULL); + ci = fscrypt_get_lblk_info(inode, next_lblk, &ci_offset, NULL); /* * Comparing the key pointers is good enough, as all I/O for each key * uses the same pointer. I.e., there's currently no need to support * merging requests where the keys are the same but the pointers differ. */ - if (bc->bc_key != ci->ci_enc_key->blk_key) + if (!ci || bc->bc_key != ci->ci_enc_key->blk_key) return false; - fscrypt_generate_dun(ci, next_lblk, next_dun); + fscrypt_generate_dun(ci, ci_offset, next_dun); return bio_crypt_dun_is_contiguous(bc, bio->bi_iter.bi_size, next_dun); } EXPORT_SYMBOL_GPL(fscrypt_mergeable_bio); @@ -460,6 +464,8 @@ u64 fscrypt_limit_io_blocks(const struct inode *inode, u64 lblk, u64 nr_blocks) { const struct fscrypt_info *ci; u32 dun; + u64 ci_offset = 0; + u64 extent_len = 0; if (!fscrypt_inode_uses_inline_crypto(inode)) return nr_blocks; @@ -467,14 +473,18 @@ u64 fscrypt_limit_io_blocks(const struct inode *inode, u64 lblk, u64 nr_blocks) if (nr_blocks <= 1) return nr_blocks; - ci = fscrypt_get_lblk_info(inode, lblk, NULL, NULL); + ci = fscrypt_get_lblk_info(inode, lblk, &ci_offset, &extent_len); + + /* Spanning an extent boundary will change the DUN */ + nr_blocks = min_t(u64, nr_blocks, extent_len); + if (!(fscrypt_policy_flags(&ci->ci_policy) & FSCRYPT_POLICY_FLAG_IV_INO_LBLK_32)) return nr_blocks; /* With IV_INO_LBLK_32, the DUN can wrap around from U32_MAX to 0. */ - dun = ci->ci_hashed_ino + lblk; + dun = ci->ci_hashed_ino + ci_offset; return min_t(u64, nr_blocks, (u64)U32_MAX + 1 - dun); }