From patchwork Tue Apr 13 17:50:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffrey Layton X-Patchwork-Id: 12201117 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_NONE,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09295C4361A for ; Tue, 13 Apr 2021 17:51:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DDA9661176 for ; Tue, 13 Apr 2021 17:51:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347471AbhDMRvj (ORCPT ); Tue, 13 Apr 2021 13:51:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:45038 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347449AbhDMRva (ORCPT ); Tue, 13 Apr 2021 13:51:30 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D805B613B8; Tue, 13 Apr 2021 17:51:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618336267; bh=TviWrPPnC1gTnbi2XdMVlKDC0scJdqGSyrBmZE+Egjw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JMpfszAZ+Dlr58Z/wfc48g+cYnIg/ujuzedlJGTD2CUsEcQLGbpZMvQk3kaucOZp9 Vo0bl5LMFwZKmN14Cgp03Th+ebCUwKpXgZQ/t0vs8exV/j6v2mDpNZ0Q85gv1JOB04 h77xUrdHEkehSWYXm0uSBrFT7Zvbaf3QmLY3HmL+I008MwK4HeRJm1ef+Ztiag4hsk 0UllykpZJua/9mnRfect5KV5xYlCL58MxhfsTdNNGbwZ1t1u5SOPRJ6/+QRkPcgiIJ SX989mwRWPAJlHA7Zx9Y2Gh86e37vTwTFjtqkmjPsnty28gnH/ggmpy6dyX8lNxbA9 QSzVulWW9Tkeg== From: Jeff Layton To: ceph-devel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-fscrypt@vger.kernel.org, lhenriques@suse.de Subject: [RFC PATCH v6 20/20] ceph: add fscrypt ioctls Date: Tue, 13 Apr 2021 13:50:52 -0400 Message-Id: <20210413175052.163865-21-jlayton@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210413175052.163865-1-jlayton@kernel.org> References: <20210413175052.163865-1-jlayton@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org We gate most of the ioctls on MDS feature support. The exception is the key removal and status functions that we still want to work if the MDS's were to (inexplicably) lose the feature. For the set_policy ioctl, we take Fcx caps to ensure that nothing can create files in the directory while the ioctl is running. That should be enough to ensure that the "empty_dir" check is reliable. Signed-off-by: Jeff Layton --- fs/ceph/ioctl.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c index 6e061bf62ad4..485be1637fc0 100644 --- a/fs/ceph/ioctl.c +++ b/fs/ceph/ioctl.c @@ -6,6 +6,7 @@ #include "mds_client.h" #include "ioctl.h" #include +#include /* * ioctls @@ -268,8 +269,55 @@ static long ceph_ioctl_syncio(struct file *file) return 0; } +static int vet_mds_for_fscrypt(struct file *file) +{ + int i, ret = -EOPNOTSUPP; + struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(file_inode(file)->i_sb); + + mutex_lock(&mdsc->mutex); + for (i = 0; i < mdsc->max_sessions; i++) { + struct ceph_mds_session *s = mdsc->sessions[i]; + + if (!s) + continue; + if (test_bit(CEPHFS_FEATURE_ALTERNATE_NAME, &s->s_features)) + ret = 0; + break; + } + mutex_unlock(&mdsc->mutex); + return ret; +} + +static long ceph_set_encryption_policy(struct file *file, unsigned long arg) +{ + int ret, got = 0; + struct inode *inode = file_inode(file); + struct ceph_inode_info *ci = ceph_inode(inode); + + ret = vet_mds_for_fscrypt(file); + if (ret) + return ret; + + /* + * Ensure we hold these caps so that we _know_ that the rstats check + * in the empty_dir check is reliable. + */ + ret = ceph_get_caps(file, CEPH_CAP_FILE_SHARED, 0, -1, &got); + if (ret) + return ret; + + ret = fscrypt_ioctl_set_policy(file, (const void __user *)arg); + if (got) + ceph_put_cap_refs(ci, got); + + return ret; +} + long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { + int ret; + struct ceph_inode_info *ci = ceph_inode(file_inode(file)); + dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg); switch (cmd) { case CEPH_IOC_GET_LAYOUT: @@ -289,6 +337,51 @@ long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case CEPH_IOC_SYNCIO: return ceph_ioctl_syncio(file); + + case FS_IOC_SET_ENCRYPTION_POLICY: + return ceph_set_encryption_policy(file, arg); + + case FS_IOC_GET_ENCRYPTION_POLICY: + ret = vet_mds_for_fscrypt(file); + if (ret) + return ret; + return fscrypt_ioctl_get_policy(file, (void __user *)arg); + + case FS_IOC_GET_ENCRYPTION_POLICY_EX: + ret = vet_mds_for_fscrypt(file); + if (ret) + return ret; + return fscrypt_ioctl_get_policy_ex(file, (void __user *)arg); + + case FS_IOC_ADD_ENCRYPTION_KEY: + ret = vet_mds_for_fscrypt(file); + if (ret) + return ret; + atomic_inc(&ci->i_shared_gen); + ceph_dir_clear_ordered(file_inode(file)); + ceph_dir_clear_complete(file_inode(file)); + return fscrypt_ioctl_add_key(file, (void __user *)arg); + + case FS_IOC_REMOVE_ENCRYPTION_KEY: + atomic_inc(&ci->i_shared_gen); + ceph_dir_clear_ordered(file_inode(file)); + ceph_dir_clear_complete(file_inode(file)); + return fscrypt_ioctl_remove_key(file, (void __user *)arg); + + case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: + atomic_inc(&ci->i_shared_gen); + ceph_dir_clear_ordered(file_inode(file)); + ceph_dir_clear_complete(file_inode(file)); + return fscrypt_ioctl_remove_key_all_users(file, (void __user *)arg); + + case FS_IOC_GET_ENCRYPTION_KEY_STATUS: + return fscrypt_ioctl_get_key_status(file, (void __user *)arg); + + case FS_IOC_GET_ENCRYPTION_NONCE: + ret = vet_mds_for_fscrypt(file); + if (ret) + return ret; + return fscrypt_ioctl_get_nonce(file, (void __user *)arg); } return -ENOTTY;