From patchwork Tue Nov 29 10:39:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Luis Henriques X-Patchwork-Id: 629183 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 5E9AAC4332F for ; Tue, 29 Nov 2022 10:38:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230343AbiK2Kit (ORCPT ); Tue, 29 Nov 2022 05:38:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229954AbiK2Kis (ORCPT ); Tue, 29 Nov 2022 05:38:48 -0500 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A5311B798; Tue, 29 Nov 2022 02:38:47 -0800 (PST) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id C388F1FDDE; Tue, 29 Nov 2022 10:38:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1669718325; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=Sn6kDglaa1mYzXYIabbpumL2ZI4pe8py+KGgBZKikr4=; b=xvGmib6LfzlkleVx5q55PBbYpRgpUGDzrU0zq4cLC8FTTnSDXjvymWO2ctyL+dUdE0NP6S uSkKnFx3ZE+oDwgUNey51yZsqp7mQu4budFWYB9rJ8KyI3StqLuhAKF1T2Cv7azsP5ooc4 DfCVNgzQg9g8h99zSU4SfAXBvEsJzAs= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1669718325; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=Sn6kDglaa1mYzXYIabbpumL2ZI4pe8py+KGgBZKikr4=; b=efSCJ2l9eDfdL53PqoinnDf+OPrlWHBcYaHaTx10xJ9C4ph8UGBP/XBJvgU2YqaF6/g39o KWNN46svvi0PurBg== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 5BEE113AF6; Tue, 29 Nov 2022 10:38:45 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id ODuNEzXhhWMCSwAAMHmgww (envelope-from ); Tue, 29 Nov 2022 10:38:45 +0000 Received: from localhost (brahms.olymp [local]) by brahms.olymp (OpenSMTPD) with ESMTPA id d80b8a47; Tue, 29 Nov 2022 10:39:50 +0000 (UTC) From: =?utf-8?q?Lu=C3=ADs_Henriques?= To: Xiubo Li , Ilya Dryomov , Jeff Layton Cc: ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?Lu?= =?utf-8?q?=C3=ADs_Henriques?= Subject: [PATCH v4] ceph: mark directory as non-complete complete after loading key Date: Tue, 29 Nov 2022 10:39:49 +0000 Message-Id: <20221129103949.19737-1-lhenriques@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org When setting a directory's crypt context, ceph_dir_clear_complete() needs to be called otherwise if it was complete before, any existing (old) dentry will still be valid. This patch adds a wrapper around __fscrypt_prepare_readdir() which will ensure a directory is marked as non-complete if key status changes. Signed-off-by: Luís Henriques --- Hi Xiubo, Here's a rebase of this patch. I did some testing but since this branch doesn't really have full fscrypt support, I couldn't even reproduce the bug. So, my testing was limited. Changes since v3: - Rebased patch to 'testing' branch Changes since v2: - Created helper wrapper for __fscrypt_prepare_readdir() - Added calls to the new helper Changes since v1: - Moved the __ceph_dir_clear_complete() call from ceph_crypt_get_context() to ceph_lookup(). - Added an __fscrypt_prepare_readdir() wrapper to check key status changes fs/ceph/crypto.c | 35 +++++++++++++++++++++++++++++++++-- fs/ceph/crypto.h | 6 ++++++ fs/ceph/dir.c | 8 ++++---- fs/ceph/mds_client.c | 6 +++--- 4 files changed, 46 insertions(+), 9 deletions(-) diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c index 5b807f8f4c69..fe47fbdaead9 100644 --- a/fs/ceph/crypto.c +++ b/fs/ceph/crypto.c @@ -277,8 +277,8 @@ int ceph_fname_to_usr(const struct ceph_fname *fname, struct fscrypt_str *tname, if (fname->name_len > NAME_MAX || fname->ctext_len > NAME_MAX) return -EIO; - ret = __fscrypt_prepare_readdir(fname->dir); - if (ret) + ret = ceph_fscrypt_prepare_readdir(fname->dir); + if (ret < 0) return ret; /* @@ -323,3 +323,34 @@ int ceph_fname_to_usr(const struct ceph_fname *fname, struct fscrypt_str *tname, fscrypt_fname_free_buffer(&_tname); return ret; } + +/** + * ceph_fscrypt_prepare_readdir - simple __fscrypt_prepare_readdir() wrapper + * @dir: directory inode for readdir prep + * + * Simple wrapper around __fscrypt_prepare_readdir() that will mark directory as + * non-complete if this call results in having the directory unlocked. + * + * Returns: + * 1 - if directory was locked and key is now loaded (i.e. dir is unlocked) + * 0 - if directory is still locked + * < 0 - if __fscrypt_prepare_readdir() fails + */ +int ceph_fscrypt_prepare_readdir(struct inode *dir) +{ + bool had_key = fscrypt_has_encryption_key(dir); + int err; + + if (!IS_ENCRYPTED(dir)) + return 0; + + err = __fscrypt_prepare_readdir(dir); + if (err) + return err; + if (!had_key && fscrypt_has_encryption_key(dir)) { + /* directory just got unlocked, mark it as not complete */ + ceph_dir_clear_complete(dir); + return 1; + } + return 0; +} diff --git a/fs/ceph/crypto.h b/fs/ceph/crypto.h index 05db33f1a421..f8d5f33f708a 100644 --- a/fs/ceph/crypto.h +++ b/fs/ceph/crypto.h @@ -94,6 +94,7 @@ static inline void ceph_fname_free_buffer(struct inode *parent, struct fscrypt_s int ceph_fname_to_usr(const struct ceph_fname *fname, struct fscrypt_str *tname, struct fscrypt_str *oname, bool *is_nokey); +int ceph_fscrypt_prepare_readdir(struct inode *dir); #else /* CONFIG_FS_ENCRYPTION */ @@ -147,6 +148,11 @@ static inline int ceph_fname_to_usr(const struct ceph_fname *fname, struct fscry oname->len = fname->name_len; return 0; } + +static inline int ceph_fscrypt_prepare_readdir(struct inode *dir) +{ + return 0; +} #endif /* CONFIG_FS_ENCRYPTION */ #endif diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index b136fb923b7a..bc908d0dd224 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -343,8 +343,8 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) ctx->pos = 2; } - err = fscrypt_prepare_readdir(inode); - if (err) + err = ceph_fscrypt_prepare_readdir(inode); + if (err < 0) return err; spin_lock(&ci->i_ceph_lock); @@ -784,8 +784,8 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, return ERR_PTR(-ENAMETOOLONG); if (IS_ENCRYPTED(dir)) { - err = __fscrypt_prepare_readdir(dir); - if (err) + err = ceph_fscrypt_prepare_readdir(dir); + if (err < 0) return ERR_PTR(err); if (!fscrypt_has_encryption_key(dir)) { spin_lock(&dentry->d_lock); diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index e3683305445c..cbbaf334b6b8 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -2551,8 +2551,8 @@ static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen) if (!IS_ENCRYPTED(dir)) goto success; - ret = __fscrypt_prepare_readdir(dir); - if (ret) + ret = ceph_fscrypt_prepare_readdir(dir); + if (ret < 0) return ERR_PTR(ret); /* No key? Just ignore it. */ @@ -2668,7 +2668,7 @@ char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase, int for spin_unlock(&cur->d_lock); parent = dget_parent(cur); - ret = __fscrypt_prepare_readdir(d_inode(parent)); + ret = ceph_fscrypt_prepare_readdir(d_inode(parent)); if (ret < 0) { dput(parent); dput(cur);