From patchwork Mon Aug 7 13:26:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksandr Mikhalitsyn X-Patchwork-Id: 13344219 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 D05F9C41513 for ; Mon, 7 Aug 2023 13:29:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234186AbjHGN3X (ORCPT ); Mon, 7 Aug 2023 09:29:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234087AbjHGN3N (ORCPT ); Mon, 7 Aug 2023 09:29:13 -0400 Received: from smtp-relay-internal-1.canonical.com (smtp-relay-internal-1.canonical.com [185.125.188.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6EEF1BE8 for ; Mon, 7 Aug 2023 06:28:48 -0700 (PDT) Received: from mail-ej1-f69.google.com (mail-ej1-f69.google.com [209.85.218.69]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id 657863F189 for ; Mon, 7 Aug 2023 13:28:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1691414888; bh=CtBJRc4HIc+srecN6BR4LVumWEoikJhCfq0jTrx0/xU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=W6Kd+PuooTohbbUm+R3cZkXtBhewoL8EaFWpeGphkKMGEPR/ThsVO3g7cMUrtOhib JB7HD1LaqJj9OlJcmx0v6kN3mZ2LlGmz2HqbqzxWcsSx4OzpWjBuJkjtykDZmzx6kG SOdWQ0aZGHXxq8WuprmJjHrGExga2pTs3XgRqdtYKeXqCjESan4nUKwRXYnDqVE9nI +5l9aBCBkMoDNcrKJtRytDVKOnRCdDB/f+bLqh0zCf1gTCyrwZN6g3w0cdPsDpjaSB v3BrvPem33nOzdjQZ3UlCk/2zMZaBvOnBl9TJrkRxAraFW6EmFKI2tHlOtJAd4tiJP xg3ese3zJZmsQ== Received: by mail-ej1-f69.google.com with SMTP id a640c23a62f3a-99beea69484so344947966b.0 for ; Mon, 07 Aug 2023 06:28:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691414888; x=1692019688; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=CtBJRc4HIc+srecN6BR4LVumWEoikJhCfq0jTrx0/xU=; b=T0cbSGcoviLCR6pMPycPydF82hCJm1PZIVA/51YSiw4Pf79d8UsnQZgfI4/Rn0vyJN JHMg+7CoQRCJXdA2tcbEjMe4AyPTbMO3spUuvNTt7k0+hrPf0w4ET60y4r5U7aS0hINE fc7/lzgkfyH+EXozweKkd8XgUIFDtrpogSyukvprYZeXUPjIf2bpjJkqKkkzyWn8eI5F JzR1tA3x0y03d9eKbYd0lXuMIdomL4FDQFACYhSw6F6lYrKeg2xA0H7K7IWXvqT4qF5j 4WclYG0Lz65NY5Dw2TmtVjDr08FqA/B4vtU0K4vdjqAcBC4kYU14YXNinboIz/9+fBzo lIdQ== X-Gm-Message-State: AOJu0Yxt6vS5FzQ65TjbvffXX7VdSZefwMuzq2mEZrw7oCYvfAYLe5bz NFGEtvtPTtr67a/1xMi/0rYoy0AP6FRUZPKNF+1zAGzzZLvPOEF5ESYe4pPy9BznHoQD9jS8XTQ zPf2jw1qnd+oWSq62VlHsH/nvOwmeAWpRyyUWIwwsll4= X-Received: by 2002:a17:906:209c:b0:99b:d599:5086 with SMTP id 28-20020a170906209c00b0099bd5995086mr9623741ejq.75.1691414887905; Mon, 07 Aug 2023 06:28:07 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGyP5yIIrtiTVTtjzAf4BH44AU/ig6VCb8VPJwFX70tY7iKrYzWW3+k82ej/+HuCN4g9kHkJQ== X-Received: by 2002:a17:906:209c:b0:99b:d599:5086 with SMTP id 28-20020a170906209c00b0099bd5995086mr9623729ejq.75.1691414887721; Mon, 07 Aug 2023 06:28:07 -0700 (PDT) Received: from amikhalitsyn.local (dslb-088-066-182-192.088.066.pools.vodafone-ip.de. [88.66.182.192]) by smtp.gmail.com with ESMTPSA id lg12-20020a170906f88c00b00992ca779f42sm5175257ejb.97.2023.08.07.06.28.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Aug 2023 06:28:07 -0700 (PDT) From: Alexander Mikhalitsyn To: xiubli@redhat.com Cc: brauner@kernel.org, stgraber@ubuntu.com, linux-fsdevel@vger.kernel.org, Jeff Layton , Ilya Dryomov , ceph-devel@vger.kernel.org, Alexander Mikhalitsyn , linux-kernel@vger.kernel.org Subject: [PATCH v10 03/12] ceph: handle idmapped mounts in create_request_message() Date: Mon, 7 Aug 2023 15:26:17 +0200 Message-Id: <20230807132626.182101-4-aleksandr.mikhalitsyn@canonical.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230807132626.182101-1-aleksandr.mikhalitsyn@canonical.com> References: <20230807132626.182101-1-aleksandr.mikhalitsyn@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Christian Brauner Inode operations that create a new filesystem object such as ->mknod, ->create, ->mkdir() and others don't take a {g,u}id argument explicitly. Instead the caller's fs{g,u}id is used for the {g,u}id of the new filesystem object. In order to ensure that the correct {g,u}id is used map the caller's fs{g,u}id for creation requests. This doesn't require complex changes. It suffices to pass in the relevant idmapping recorded in the request message. If this request message was triggered from an inode operation that creates filesystem objects it will have passed down the relevant idmaping. If this is a request message that was triggered from an inode operation that doens't need to take idmappings into account the initial idmapping is passed down which is an identity mapping. This change uses a new cephfs protocol extension CEPHFS_FEATURE_HAS_OWNER_UIDGID which adds two new fields (owner_{u,g}id) to the request head structure. So, we need to ensure that MDS supports it otherwise we need to fail any IO that comes through an idmapped mount because we can't process it in a proper way. MDS server without such an extension will use caller_{u,g}id fields to set a new inode owner UID/GID which is incorrect because caller_{u,g}id values are unmapped. At the same time we can't map these fields with an idmapping as it can break UID/GID-based permission checks logic on the MDS side. This problem was described with a lot of details at [1], [2]. [1] https://lore.kernel.org/lkml/CAEivzxfw1fHO2TFA4dx3u23ZKK6Q+EThfzuibrhA3RKM=ZOYLg@mail.gmail.com/ [2] https://lore.kernel.org/all/20220104140414.155198-3-brauner@kernel.org/ Link: https://github.com/ceph/ceph/pull/52575 Link: https://tracker.ceph.com/issues/62217 Cc: Xiubo Li Cc: Jeff Layton Cc: Ilya Dryomov Cc: ceph-devel@vger.kernel.org Co-Developed-by: Alexander Mikhalitsyn Signed-off-by: Christian Brauner Signed-off-by: Alexander Mikhalitsyn Acked-by: Christian Brauner --- v7: - reworked to use two new fields for owner UID/GID (https://github.com/ceph/ceph/pull/52575) v8: - properly handled case when old MDS used with new kernel client v10: - fill struct_len field properly (use cpu_to_le32) - add extra checks IS_CEPH_MDS_OP_NEWINODE(..) as requested by Xiubo to match userspace client behavior --- fs/ceph/mds_client.c | 55 ++++++++++++++++++++++++++++++++++-- fs/ceph/mds_client.h | 5 +++- include/linux/ceph/ceph_fs.h | 10 ++++++- 3 files changed, 65 insertions(+), 5 deletions(-) diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 8829f55103da..5114de5ea65e 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -2902,6 +2902,17 @@ static void encode_mclientrequest_tail(void **p, const struct ceph_mds_request * } } +static inline u16 mds_supported_head_version(struct ceph_mds_session *session) +{ + if (!test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, &session->s_features)) + return 1; + + if (!test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) + return 2; + + return CEPH_MDS_REQUEST_HEAD_VERSION; +} + static struct ceph_mds_request_head_legacy * find_legacy_request_head(void *p, u64 features) { @@ -2923,6 +2934,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_session *session, { int mds = session->s_mds; struct ceph_mds_client *mdsc = session->s_mdsc; + struct ceph_client *cl = mdsc->fsc->client; struct ceph_msg *msg; struct ceph_mds_request_head_legacy *lhead; const char *path1 = NULL; @@ -2936,7 +2948,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_session *session, void *p, *end; int ret; bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME); - bool old_version = !test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, &session->s_features); + u16 request_head_version = mds_supported_head_version(session); ret = set_request_path_attr(mdsc, req->r_inode, req->r_dentry, req->r_parent, req->r_path1, req->r_ino1.ino, @@ -2977,8 +2989,10 @@ static struct ceph_msg *create_request_message(struct ceph_mds_session *session, */ if (legacy) len = sizeof(struct ceph_mds_request_head_legacy); - else if (old_version) + else if (request_head_version == 1) len = sizeof(struct ceph_mds_request_head_old); + else if (request_head_version == 2) + len = offsetofend(struct ceph_mds_request_head, ext_num_fwd); else len = sizeof(struct ceph_mds_request_head); @@ -3028,6 +3042,18 @@ static struct ceph_msg *create_request_message(struct ceph_mds_session *session, lhead = find_legacy_request_head(msg->front.iov_base, session->s_con.peer_features); + if ((req->r_mnt_idmap != &nop_mnt_idmap) && + !test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) { + WARN_ON_ONCE(!IS_CEPH_MDS_OP_NEWINODE(req->r_op)); + + pr_err_ratelimited_client(cl, + "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID" + " is not supported by MDS. Fail request with -EIO.\n"); + + ret = -EIO; + goto out_err; + } + /* * The ceph_mds_request_head_legacy didn't contain a version field, and * one was added when we moved the message version from 3->4. @@ -3035,17 +3061,40 @@ static struct ceph_msg *create_request_message(struct ceph_mds_session *session, if (legacy) { msg->hdr.version = cpu_to_le16(3); p = msg->front.iov_base + sizeof(*lhead); - } else if (old_version) { + } else if (request_head_version == 1) { struct ceph_mds_request_head_old *ohead = msg->front.iov_base; msg->hdr.version = cpu_to_le16(4); ohead->version = cpu_to_le16(1); p = msg->front.iov_base + sizeof(*ohead); + } else if (request_head_version == 2) { + struct ceph_mds_request_head *nhead = msg->front.iov_base; + + msg->hdr.version = cpu_to_le16(6); + nhead->version = cpu_to_le16(2); + + p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, ext_num_fwd); } else { struct ceph_mds_request_head *nhead = msg->front.iov_base; + kuid_t owner_fsuid; + kgid_t owner_fsgid; msg->hdr.version = cpu_to_le16(6); nhead->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION); + nhead->struct_len = cpu_to_le32(sizeof(struct ceph_mds_request_head)); + + if (IS_CEPH_MDS_OP_NEWINODE(req->r_op)) { + owner_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns, + VFSUIDT_INIT(req->r_cred->fsuid)); + owner_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns, + VFSGIDT_INIT(req->r_cred->fsgid)); + nhead->owner_uid = cpu_to_le32(from_kuid(&init_user_ns, owner_fsuid)); + nhead->owner_gid = cpu_to_le32(from_kgid(&init_user_ns, owner_fsgid)); + } else { + nhead->owner_uid = cpu_to_le32(-1); + nhead->owner_gid = cpu_to_le32(-1); + } + p = msg->front.iov_base + sizeof(*nhead); } diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index e3bbf3ba8ee8..8f683e8203bd 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -33,8 +33,10 @@ enum ceph_feature_type { CEPHFS_FEATURE_NOTIFY_SESSION_STATE, CEPHFS_FEATURE_OP_GETVXATTR, CEPHFS_FEATURE_32BITS_RETRY_FWD, + CEPHFS_FEATURE_NEW_SNAPREALM_INFO, + CEPHFS_FEATURE_HAS_OWNER_UIDGID, - CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_32BITS_RETRY_FWD, + CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_HAS_OWNER_UIDGID, }; #define CEPHFS_FEATURES_CLIENT_SUPPORTED { \ @@ -49,6 +51,7 @@ enum ceph_feature_type { CEPHFS_FEATURE_NOTIFY_SESSION_STATE, \ CEPHFS_FEATURE_OP_GETVXATTR, \ CEPHFS_FEATURE_32BITS_RETRY_FWD, \ + CEPHFS_FEATURE_HAS_OWNER_UIDGID, \ } /* diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h index 5f2301ee88bc..d0ead0b6354c 100644 --- a/include/linux/ceph/ceph_fs.h +++ b/include/linux/ceph/ceph_fs.h @@ -357,6 +357,11 @@ enum { CEPH_MDS_OP_RENAMESNAP = 0x01403, }; +#define IS_CEPH_MDS_OP_NEWINODE(op) (op == CEPH_MDS_OP_CREATE || \ + op == CEPH_MDS_OP_MKNOD || \ + op == CEPH_MDS_OP_MKDIR || \ + op == CEPH_MDS_OP_SYMLINK) + extern const char *ceph_mds_op_name(int op); #define CEPH_SETATTR_MODE (1 << 0) @@ -499,7 +504,7 @@ struct ceph_mds_request_head_legacy { union ceph_mds_request_args args; } __attribute__ ((packed)); -#define CEPH_MDS_REQUEST_HEAD_VERSION 2 +#define CEPH_MDS_REQUEST_HEAD_VERSION 3 struct ceph_mds_request_head_old { __le16 version; /* struct version */ @@ -530,6 +535,9 @@ struct ceph_mds_request_head { __le32 ext_num_retry; /* new count retry attempts */ __le32 ext_num_fwd; /* new count fwd attempts */ + + __le32 struct_len; /* to store size of struct ceph_mds_request_head */ + __le32 owner_uid, owner_gid; /* used for OPs which create inodes */ } __attribute__ ((packed)); /* cap/lease release record */