From patchwork Sun Jul 9 18:53:41 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: 13306020 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 D5E13C001DE for ; Sun, 9 Jul 2023 18:54:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229900AbjGISyF (ORCPT ); Sun, 9 Jul 2023 14:54:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57858 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229939AbjGISyE (ORCPT ); Sun, 9 Jul 2023 14:54:04 -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 7813D124; Sun, 9 Jul 2023 11:54:03 -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 BC89380AE0; Sun, 9 Jul 2023 14:54:02 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=dorminy.me; s=mail; t=1688928843; bh=Bc0Ykt0qYEJfRIkG+fty++J6AyeiIf8Gvf+5Drnz2Sk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=anKLG3RgB4vr3KIAjbjFCMzO+RY+TDtbWTDv0r+ArAedgWpWqO0t5t4QX+/uO/k2/ l3lX9KD0cvovvL2zJLR/AZ4YRrEuobdUX3PBhk0yORFJBvXpevSv9WyWd6/O+62xLu aHT5WKgy42fYI5GKfxkI4e5ofndDJSrjU6F0/ulVHgzt7U6xIh0Vuc+cgmG5tf/ABz w07DQ9/UPl5PgM70pqa9n7IJ5kwBhzK5qIh0NNgJ95IeVlEN+m02NVXC4AlSo2TTWr vsNC0Lj2gM6VDQPK+p+6/42uZL9j/tnvxJWssDo7HzXeHH9hvXhA0YBc9VcQl8k+Qe AI91yqZVuOk2g== 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 08/14] fscrypt: use an optional ino equivalent for per-extent infos Date: Sun, 9 Jul 2023 14:53:41 -0400 Message-Id: <6830afa74507c24d61510f54c34a3bee560c3b3c.1688927487.git.sweettea-kernel@dorminy.me> In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org Since per-extent infos are not tied to inodes, an ino-based policy cannot access the inode's i_ino to get the necessary information. Instead, this adds an optional fscrypt_operation pointer to get the ino equivalent for an extent, adds a wrapper to get the ino for an info, and uses this wrapper everywhere where the ci's inode's i_ino is currently accessed. Signed-off-by: Sweet Tea Dorminy --- fs/crypto/fscrypt_private.h | 18 ++++++++++++++++++ fs/crypto/keyring.c | 8 ++++---- fs/crypto/keysetup.c | 6 +++--- include/linux/fscrypt.h | 9 +++++++++ 4 files changed, 34 insertions(+), 7 deletions(-) diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h index 1674e66e72e3..8bf27ceeecd1 100644 --- a/fs/crypto/fscrypt_private.h +++ b/fs/crypto/fscrypt_private.h @@ -332,6 +332,24 @@ static inline bool fscrypt_uses_extent_encryption(const struct inode *inode) return false; } +/** + * fscrypt_get_info_ino() - get the ino or ino equivalent for an info + * + * @ci: the fscrypt_info in question + * + * Return: For inode-based encryption, this will return the info's inode's ino. + * For extent-based encryption, this will return the extent's ino equivalent + * or 0 if it is not implemented. + */ +static inline u64 fscrypt_get_info_ino(const struct fscrypt_info *ci) +{ + if (ci->ci_inode) + return ci->ci_inode->i_ino; + if (!ci->ci_sb->s_cop->get_extent_ino_equivalent) + return 0; + return ci->ci_sb->s_cop->get_extent_ino_equivalent(ci->ci_info_ptr); +} + /* crypto.c */ extern struct kmem_cache *fscrypt_info_cachep; int fscrypt_initialize(struct super_block *sb); diff --git a/fs/crypto/keyring.c b/fs/crypto/keyring.c index 0aad825087c1..bfcd2ecbe481 100644 --- a/fs/crypto/keyring.c +++ b/fs/crypto/keyring.c @@ -923,12 +923,12 @@ static int check_for_busy_inodes(struct super_block *sb, } { - /* select an example file to show for debugging purposes */ - struct inode *inode = + /* select an example info to show for debugging purposes */ + struct fscrypt_info *ci = list_first_entry(&mk->mk_decrypted_inodes, struct fscrypt_info, - ci_master_key_link)->ci_inode; - ino = inode->i_ino; + ci_master_key_link); + ino = fscrypt_get_info_ino(ci); } spin_unlock(&mk->mk_decrypted_inodes_lock); diff --git a/fs/crypto/keysetup.c b/fs/crypto/keysetup.c index 29565338d9c0..d20cee61e24f 100644 --- a/fs/crypto/keysetup.c +++ b/fs/crypto/keysetup.c @@ -380,10 +380,10 @@ int fscrypt_derive_dirhash_key(struct fscrypt_info *ci, void fscrypt_hash_inode_number(struct fscrypt_info *ci, const struct fscrypt_master_key *mk) { - WARN_ON_ONCE(ci->ci_inode->i_ino == 0); + WARN_ON_ONCE(fscrypt_get_info_ino(ci) == 0); WARN_ON_ONCE(!mk->mk_ino_hash_key_initialized); - ci->ci_hashed_ino = (u32)siphash_1u64(ci->ci_inode->i_ino, + ci->ci_hashed_ino = (u32)siphash_1u64(fscrypt_get_info_ino(ci), &mk->mk_ino_hash_key); } @@ -706,7 +706,7 @@ fscrypt_setup_encryption_info(struct inode *inode, if (res) goto out; - if (inode->i_ino) + if (fscrypt_get_info_ino(crypt_info)) fscrypt_hash_inode_number(crypt_info, mk); } diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h index 378a1f41c62f..22affbb15706 100644 --- a/include/linux/fscrypt.h +++ b/include/linux/fscrypt.h @@ -169,6 +169,15 @@ struct fscrypt_operations { void (*get_ino_and_lblk_bits)(struct super_block *sb, int *ino_bits_ret, int *lblk_bits_ret); + /* + * Get the inode number equivalent for filesystems using per-extent + * encryption keys. + * + * This function only needs to be implemented if support for one of the + * FSCRYPT_POLICY_FLAG_IV_INO_* flags is needed. + */ + u64 (*get_extent_ino_equivalent)(struct fscrypt_info **info_ptr); + /* * Return an array of pointers to the block devices to which the * filesystem may write encrypted file contents, NULL if the filesystem