From patchwork Sat Feb 8 01:35:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Rosenberg X-Patchwork-Id: 11371471 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7774D1398 for ; Sat, 8 Feb 2020 01:36:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 40F5320838 for ; Sat, 8 Feb 2020 01:36:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="qi6hH+g8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727698AbgBHBg3 (ORCPT ); Fri, 7 Feb 2020 20:36:29 -0500 Received: from mail-pl1-f201.google.com ([209.85.214.201]:41061 "EHLO mail-pl1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727591AbgBHBgK (ORCPT ); Fri, 7 Feb 2020 20:36:10 -0500 Received: by mail-pl1-f201.google.com with SMTP id p19so628135plr.8 for ; Fri, 07 Feb 2020 17:36:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=u/JnfqfNGIyu0nd68o7YqAhgzmEDUAvpvLabn2MnzDQ=; b=qi6hH+g8A2tOnXrv6e/2ktRs8azAQwUa4eik1PW9fFC/on1QVYRt6mx1zRTTCg6ZL4 4PLPJms/15mBGz7V1e3uNWcWf14g2q0GYIef3WkcY1ePchMw0ZvPpFN9Gf8MppPPm8Py J96WnaEK+ciSC0RRWk9RRXOwAvFqM2wg466NZpVWhjE4BkHO28IOlrhdx2uxKKceG/68 66ibuWm+nhw+GWAN21uIGMbfGYEdKUCr/XY6YSeNsisvJ6Ri4LadbSUqlO57k5jSw+ir 6RSVPhXPfB0duEc69ska1SVBlqHqaj10t3s3FcOAHlFOU09CBakLDdQJXJAwTfdF4u1q 6BNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=u/JnfqfNGIyu0nd68o7YqAhgzmEDUAvpvLabn2MnzDQ=; b=iEoT3ugASfqYiUuWieE1EQhFZGCrTB2oCZz96/sLxZkmgUOyY16+ptDGzawdscH1sR flWAFoFUCPWjwefQ3CaLlM/VNPJfoTLc/vqCZtUDJMGwU6jCrTmQtgn+1lgxg3IiF/1d L+RYm4kV/t2iriI84dk/sc5RgUiMgrZWtd1qwTZ1mvshbDiDB7i/7M2qvgs/3srZIevD WIeomvwBkcO0wQKJ5H+mL6srzVLQnuFvSkXQmu0bSekttm2WDvg4xYB0dP9szmwmx/Um dc5mP2bMeKxZqUc4CIXzyfhejg5GTPDnppDM78NAeJMuAto9x3A1OQHo5/JHPoVO6vWY 1sBA== X-Gm-Message-State: APjAAAWMrA5vTB7jOlj835fQMhSjbQ09XganW1HDjaXYcISZVSS4kI7K S31ZA5Kj+ETvrnyMI0REY13zdHehGvk= X-Google-Smtp-Source: APXvYqwX0BKSDJt6E69l+sKNQlU9x6vSpU7uhONO1FyDU+vIPvCd/6tEQzcHyLHyrAfNZ29zRmP2LbAccH4= X-Received: by 2002:a63:551a:: with SMTP id j26mr2072946pgb.370.1581125768440; Fri, 07 Feb 2020 17:36:08 -0800 (PST) Date: Fri, 7 Feb 2020 17:35:49 -0800 In-Reply-To: <20200208013552.241832-1-drosen@google.com> Message-Id: <20200208013552.241832-6-drosen@google.com> Mime-Version: 1.0 References: <20200208013552.241832-1-drosen@google.com> X-Mailer: git-send-email 2.25.0.341.g760bfbb309-goog Subject: [PATCH v7 5/8] fscrypt: Have filesystems handle their d_ops From: Daniel Rosenberg To: "Theodore Ts'o" , linux-ext4@vger.kernel.org, Jaegeuk Kim , Chao Yu , linux-f2fs-devel@lists.sourceforge.net, Eric Biggers , linux-fscrypt@vger.kernel.org, Alexander Viro , Richard Weinberger Cc: linux-mtd@lists.infradead.org, Andreas Dilger , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , kernel-team@android.com, Daniel Rosenberg Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This shifts the responsibility of setting up dentry operations from fscrypt to the individual filesystems, allowing them to have their own operations while still setting fscrypt's d_revalidate as appropriate. Also added helper function to libfs to unify ext4 and f2fs implementations. Signed-off-by: Daniel Rosenberg --- fs/crypto/fname.c | 7 ++---- fs/crypto/fscrypt_private.h | 1 - fs/crypto/hooks.c | 1 - fs/ext4/dir.c | 7 ------ fs/ext4/namei.c | 1 + fs/ext4/super.c | 5 ---- fs/f2fs/dir.c | 7 ------ fs/f2fs/f2fs.h | 3 --- fs/f2fs/namei.c | 1 + fs/f2fs/super.c | 1 - fs/libfs.c | 50 +++++++++++++++++++++++++++++++++++++ fs/ubifs/dir.c | 18 +++++++++++++ include/linux/fs.h | 2 ++ include/linux/fscrypt.h | 6 +++-- 14 files changed, 78 insertions(+), 32 deletions(-) diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c index 4c212442a8f7f..14c585f66f8da 100644 --- a/fs/crypto/fname.c +++ b/fs/crypto/fname.c @@ -543,7 +543,7 @@ EXPORT_SYMBOL_GPL(fscrypt_fname_siphash); * Validate dentries in encrypted directories to make sure we aren't potentially * caching stale dentries after a key has been added. */ -static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) +int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) { struct dentry *dir; int err; @@ -582,7 +582,4 @@ static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) return valid; } - -const struct dentry_operations fscrypt_d_ops = { - .d_revalidate = fscrypt_d_revalidate, -}; +EXPORT_SYMBOL(fscrypt_d_revalidate); diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h index 9aae851409e55..238075fcabb3e 100644 --- a/fs/crypto/fscrypt_private.h +++ b/fs/crypto/fscrypt_private.h @@ -250,7 +250,6 @@ extern int fscrypt_fname_encrypt(const struct inode *inode, extern bool fscrypt_fname_encrypted_size(const struct inode *inode, u32 orig_len, u32 max_len, u32 *encrypted_len_ret); -extern const struct dentry_operations fscrypt_d_ops; /* hkdf.c */ diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c index 5ef861742921c..604a028dee25a 100644 --- a/fs/crypto/hooks.c +++ b/fs/crypto/hooks.c @@ -118,7 +118,6 @@ int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry, spin_lock(&dentry->d_lock); dentry->d_flags |= DCACHE_ENCRYPTED_NAME; spin_unlock(&dentry->d_lock); - d_set_d_op(dentry, &fscrypt_d_ops); } return err; } diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c index 128198ed1a96f..18b8da7ba92f6 100644 --- a/fs/ext4/dir.c +++ b/fs/ext4/dir.c @@ -665,10 +665,3 @@ const struct file_operations ext4_dir_operations = { .open = ext4_dir_open, .release = ext4_release_dir, }; - -#ifdef CONFIG_UNICODE -const struct dentry_operations ext4_dentry_ops = { - .d_hash = generic_ci_d_hash, - .d_compare = generic_ci_d_compare, -}; -#endif diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 53ce3c331528e..e4715c154b60f 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -1614,6 +1614,7 @@ static struct buffer_head *ext4_lookup_entry(struct inode *dir, struct buffer_head *bh; err = ext4_fname_prepare_lookup(dir, dentry, &fname); + generic_set_encrypted_ci_d_ops(dir, dentry); if (err == -ENOENT) return NULL; if (err) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 9717c802d889d..4d866c3b8bdbf 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4542,11 +4542,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) goto failed_mount4; } -#ifdef CONFIG_UNICODE - if (sb->s_encoding) - sb->s_d_op = &ext4_dentry_ops; -#endif - sb->s_root = d_make_root(root); if (!sb->s_root) { ext4_msg(sb, KERN_ERR, "get root dentry failed"); diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index d822c0d5eb182..38c0e6d589be4 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -1077,10 +1077,3 @@ const struct file_operations f2fs_dir_operations = { .compat_ioctl = f2fs_compat_ioctl, #endif }; - -#ifdef CONFIG_UNICODE -const struct dentry_operations f2fs_dentry_ops = { - .d_hash = generic_ci_d_hash, - .d_compare = generic_ci_d_compare, -}; -#endif diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index e73b8752f9c8d..0fc153b5a5c09 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -3626,9 +3626,6 @@ static inline void update_sit_info(struct f2fs_sb_info *sbi) {} #endif extern const struct file_operations f2fs_dir_operations; -#ifdef CONFIG_UNICODE -extern const struct dentry_operations f2fs_dentry_ops; -#endif extern const struct file_operations f2fs_file_operations; extern const struct inode_operations f2fs_file_inode_operations; extern const struct address_space_operations f2fs_dblock_aops; diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 2aa035422c0fa..24d68eafffa40 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -494,6 +494,7 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, } err = fscrypt_prepare_lookup(dir, dentry, &fname); + generic_set_encrypted_ci_d_ops(dir, dentry); if (err == -ENOENT) goto out_splice; if (err) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 89b52629bd437..7520a9c04c75e 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -3256,7 +3256,6 @@ static int f2fs_setup_casefold(struct f2fs_sb_info *sbi) sbi->sb->s_encoding = encoding; sbi->sb->s_encoding_flags = encoding_flags; - sbi->sb->s_d_op = &f2fs_dentry_ops; } #else if (f2fs_sb_has_casefold(sbi)) { diff --git a/fs/libfs.c b/fs/libfs.c index 433c283df3099..75dcf1e1a0488 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -1437,4 +1437,54 @@ int generic_ci_d_hash(const struct dentry *dentry, struct qstr *str) return ret; } EXPORT_SYMBOL(generic_ci_d_hash); + +static const struct dentry_operations generic_ci_dentry_ops = { + .d_hash = generic_ci_d_hash, + .d_compare = generic_ci_d_compare, +}; +#endif + +#ifdef CONFIG_FS_ENCRYPTION +static const struct dentry_operations generic_encrypted_dentry_ops = { + .d_revalidate = fscrypt_d_revalidate, +}; +#endif + +#if IS_ENABLED(CONFIG_UNICODE) && IS_ENABLED(CONFIG_FS_ENCRYPTION) +static const struct dentry_operations generic_encrypted_ci_dentry_ops = { + .d_hash = generic_ci_d_hash, + .d_compare = generic_ci_d_compare, + .d_revalidate = fscrypt_d_revalidate, +}; +#endif + +/** + * generic_set_encrypted_ci_d_ops - helper for setting d_ops for given dentry + * @dir: parent of dentry whose ops to set + * @dentry: detnry to set ops on + * + * This function sets the dentry ops for the given dentry to handle both + * casefolding and encryption of the dentry name. + */ +void generic_set_encrypted_ci_d_ops(struct inode *dir, struct dentry *dentry) +{ +#ifdef CONFIG_FS_ENCRYPTION + if (dentry->d_flags & DCACHE_ENCRYPTED_NAME) { +#ifdef CONFIG_UNICODE + if (dir->i_sb->s_encoding) { + d_set_d_op(dentry, &generic_encrypted_ci_dentry_ops); + return; + } #endif + d_set_d_op(dentry, &generic_encrypted_dentry_ops); + return; + } +#endif +#ifdef CONFIG_UNICODE + if (dir->i_sb->s_encoding) { + d_set_d_op(dentry, &generic_ci_dentry_ops); + return; + } +#endif +} +EXPORT_SYMBOL(generic_set_encrypted_ci_d_ops); diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index ef85ec167a843..f3c96d99c0514 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -196,6 +196,7 @@ static int dbg_check_name(const struct ubifs_info *c, return 0; } +static void ubifs_set_d_ops(struct inode *dir, struct dentry *dentry); static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { @@ -209,6 +210,7 @@ static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino); err = fscrypt_prepare_lookup(dir, dentry, &nm); + ubifs_set_d_ops(dir, dentry); if (err == -ENOENT) return d_splice_alias(NULL, dentry); if (err) @@ -1655,3 +1657,19 @@ const struct file_operations ubifs_dir_operations = { .compat_ioctl = ubifs_compat_ioctl, #endif }; + +#ifdef CONFIG_FS_ENCRYPTION +static const struct dentry_operations ubifs_encrypted_dentry_ops = { + .d_revalidate = fscrypt_d_revalidate, +}; +#endif + +static void ubifs_set_d_ops(struct inode *dir, struct dentry *dentry) +{ +#ifdef CONFIG_FS_ENCRYPTION + if (dentry->d_flags & DCACHE_ENCRYPTED_NAME) { + d_set_d_op(dentry, &ubifs_encrypted_dentry_ops); + return; + } +#endif +} diff --git a/include/linux/fs.h b/include/linux/fs.h index a260afbc06d22..a72ae9f14d016 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3382,6 +3382,8 @@ static inline bool needs_casefold(const struct inode *dir) return 0; } #endif +extern void generic_set_encrypted_ci_d_ops(struct inode *dir, + struct dentry *dentry); #ifdef CONFIG_MIGRATION extern int buffer_migrate_page(struct address_space *, diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h index 556f4adf5dc58..340ef5b88772f 100644 --- a/include/linux/fscrypt.h +++ b/include/linux/fscrypt.h @@ -134,6 +134,7 @@ static inline struct page *fscrypt_pagecache_page(struct page *bounce_page) } extern void fscrypt_free_bounce_page(struct page *bounce_page); +extern int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags); /* policy.c */ extern int fscrypt_ioctl_set_policy(struct file *, const void __user *); @@ -595,8 +596,9 @@ static inline int fscrypt_prepare_rename(struct inode *old_dir, * filenames are presented in encrypted form. Therefore, we'll try to set up * the directory's encryption key, but even without it the lookup can continue. * - * This also installs a custom ->d_revalidate() method which will invalidate the - * dentry if it was created without the key and the key is later added. + * After calling this function, a filesystem should ensure that it's dentry + * operations contain fscrypt_d_revalidate if DCACHE_ENCRYPTED_NAME was set, + * so that the dentry can be invalidated if the key is later added. * * Return: 0 on success; -ENOENT if key is unavailable but the filename isn't a * correctly formed encoded ciphertext name, so a negative dentry should be