From patchwork Tue Aug 16 11:02:59 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Gruenbacher X-Patchwork-Id: 9283579 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 301F860839 for ; Tue, 16 Aug 2016 11:11:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 213B0286F0 for ; Tue, 16 Aug 2016 11:11:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 15D1B28704; Tue, 16 Aug 2016 11:11:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B0301286F0 for ; Tue, 16 Aug 2016 11:11:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753396AbcHPLLn (ORCPT ); Tue, 16 Aug 2016 07:11:43 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59288 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753182AbcHPLLl (ORCPT ); Tue, 16 Aug 2016 07:11:41 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 89482C057FA9; Tue, 16 Aug 2016 11:04:45 +0000 (UTC) Received: from nux.redhat.com (vpn1-4-81.ams2.redhat.com [10.36.4.81]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u7GB34Fk006464; Tue, 16 Aug 2016 07:04:40 -0400 From: Andreas Gruenbacher To: Alexander Viro Cc: Andreas Gruenbacher , Christoph Hellwig , "Theodore Ts'o" , Andreas Dilger , "J. Bruce Fields" , Jeff Layton , Trond Myklebust , Anna Schumaker , Dave Chinner , linux-ext4@vger.kernel.org, xfs@oss.sgi.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH v25 18/22] richacl: Add richacl xattr handler Date: Tue, 16 Aug 2016 13:02:59 +0200 Message-Id: <1471345383-15334-19-git-send-email-agruenba@redhat.com> In-Reply-To: <1471345383-15334-1-git-send-email-agruenba@redhat.com> References: <1471345383-15334-1-git-send-email-agruenba@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Tue, 16 Aug 2016 11:04:45 +0000 (UTC) Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add richacl xattr handler implementing the xattr operations based on the get_richacl and set_richacl inode operations. Signed-off-by: Andreas Gruenbacher Reviewed-by: Jeff Layton --- fs/richacl.c | 22 ++++++++++++++++ fs/richacl_xattr.c | 61 +++++++++++++++++++++++++++++++++++++++++++ include/linux/richacl.h | 1 + include/linux/richacl_xattr.h | 2 ++ 4 files changed, 86 insertions(+) diff --git a/fs/richacl.c b/fs/richacl.c index 4edce8b..1945691 100644 --- a/fs/richacl.c +++ b/fs/richacl.c @@ -543,6 +543,28 @@ restart: EXPORT_SYMBOL_GPL(richacl_compute_max_masks); /** + * set_richacl - set the richacl of an inode + * @inode: inode whose richacl to set + * @acl: access control list + */ +int +set_richacl(struct inode *inode, struct richacl *acl) +{ + if (!IS_RICHACL(inode)) + return -EOPNOTSUPP; + if (!inode->i_op->set_richacl) + return -EOPNOTSUPP; + + if (!uid_eq(current_fsuid(), inode->i_uid) && + inode_permission(inode, MAY_CHMOD) && + !capable(CAP_FOWNER)) + return -EPERM; + + return inode->i_op->set_richacl(inode, acl); +} +EXPORT_SYMBOL(set_richacl); + +/** * __richacl_chmod - update the file masks to reflect the new mode * @acl: access control list * @mode: new file permission bits including the file type diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c index dc1ad36..5eb4aba 100644 --- a/fs/richacl_xattr.c +++ b/fs/richacl_xattr.c @@ -18,7 +18,9 @@ #include #include #include +#include #include +#include /** * richacl_from_xattr - convert a richacl xattr into the in-memory representation @@ -159,3 +161,62 @@ richacl_to_xattr(struct user_namespace *user_ns, return real_size; } EXPORT_SYMBOL_GPL(richacl_to_xattr); + +static bool +richacl_xattr_list(struct dentry *dentry) +{ + return IS_RICHACL(d_backing_inode(dentry)); +} + +static int +richacl_xattr_get(const struct xattr_handler *handler, + struct dentry *unused, struct inode *inode, + const char *name, void *buffer, size_t buffer_size) +{ + struct richacl *acl; + int error; + + if (*name) + return -EINVAL; + if (!IS_RICHACL(inode)) + return -EOPNOTSUPP; + if (S_ISLNK(inode->i_mode)) + return -EOPNOTSUPP; + acl = get_richacl(inode); + if (IS_ERR(acl)) + return PTR_ERR(acl); + if (acl == NULL) + return -ENODATA; + error = richacl_to_xattr(current_user_ns(), acl, buffer, buffer_size); + richacl_put(acl); + return error; +} + +static int +richacl_xattr_set(const struct xattr_handler *handler, + struct dentry *unused, struct inode *inode, + const char *name, const void *value, size_t size, + int flags) +{ + struct richacl *acl = NULL; + int ret; + + if (value) { + acl = richacl_from_xattr(current_user_ns(), value, size, + -EINVAL); + if (IS_ERR(acl)) + return PTR_ERR(acl); + } + + ret = set_richacl(inode, acl); + richacl_put(acl); + return ret; +} + +struct xattr_handler richacl_xattr_handler = { + .name = XATTR_NAME_RICHACL, + .list = richacl_xattr_list, + .get = richacl_xattr_get, + .set = richacl_xattr_set, +}; +EXPORT_SYMBOL(richacl_xattr_handler); diff --git a/include/linux/richacl.h b/include/linux/richacl.h index 737513b..7530920 100644 --- a/include/linux/richacl.h +++ b/include/linux/richacl.h @@ -205,5 +205,6 @@ extern int richacl_chmod(struct inode *, umode_t); extern int richacl_equiv_mode(const struct richacl *, umode_t *); extern struct richacl *richacl_inherit(const struct richacl *, int); extern struct richacl *richacl_create(umode_t *, struct inode *); +extern int set_richacl(struct inode *, struct richacl *); #endif /* __RICHACL_H */ diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h index 0efa14b..6c6adb1 100644 --- a/include/linux/richacl_xattr.h +++ b/include/linux/richacl_xattr.h @@ -26,4 +26,6 @@ extern size_t richacl_xattr_size(const struct richacl *); extern int richacl_to_xattr(struct user_namespace *, const struct richacl *, void *, size_t); +extern struct xattr_handler richacl_xattr_handler; + #endif /* __RICHACL_XATTR_H */