From patchwork Tue Aug 16 11:03:01 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Gruenbacher X-Patchwork-Id: 9283627 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 BE48E60839 for ; Tue, 16 Aug 2016 11:13:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AE702286F0 for ; Tue, 16 Aug 2016 11:13:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A31AD28704; Tue, 16 Aug 2016 11:13:54 +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 CE9EE286F0 for ; Tue, 16 Aug 2016 11:13:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753294AbcHPLNS (ORCPT ); Tue, 16 Aug 2016 07:13:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48850 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753267AbcHPLNQ (ORCPT ); Tue, 16 Aug 2016 07:13:16 -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 3C85985547; Tue, 16 Aug 2016 11:04:56 +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 u7GB34Fm006464; Tue, 16 Aug 2016 07:04:51 -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 20/22] vfs: Move check_posix_acl and check_richacl out of fs/namei.c Date: Tue, 16 Aug 2016 13:03:01 +0200 Message-Id: <1471345383-15334-21-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 [10.5.110.28]); Tue, 16 Aug 2016 11:04:56 +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 By moving those functions into fs/posix_acl.c and fs/richacl.c, the ifdefs can be moved into include/linux/posix_acl.h and include/linux/richacl.h. This may be seen as a small improvement. Suggested-by: Jeff Layton Signed-off-by: Andreas Gruenbacher --- fs/namei.c | 72 ++++------------------------------------------- fs/posix_acl.c | 28 ++++++++++++++++++ fs/richacl.c | 28 ++++++++++++++++++ include/linux/posix_acl.h | 5 ++++ include/linux/richacl.h | 8 ++++++ 5 files changed, 74 insertions(+), 67 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 63feb3c..3830ef1 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -258,73 +258,6 @@ void putname(struct filename *name) __putname(name); } -static int check_richacl(struct inode *inode, int mask) -{ -#ifdef CONFIG_FS_RICHACL - if (mask & MAY_NOT_BLOCK) { - struct base_acl *base_acl; - - base_acl = rcu_dereference(inode->i_acl); - if (!base_acl) - goto no_acl; - /* no ->get_richacl() calls in RCU mode... */ - if (is_uncached_acl(base_acl)) - return -ECHILD; - return richacl_permission(inode, richacl(base_acl), - mask & ~MAY_NOT_BLOCK); - } else { - struct richacl *acl; - - acl = get_richacl(inode); - if (IS_ERR(acl)) - return PTR_ERR(acl); - if (acl) { - int error = richacl_permission(inode, acl, mask); - richacl_put(acl); - return error; - } - } -no_acl: -#endif - if (mask & (MAY_DELETE_SELF | MAY_TAKE_OWNERSHIP | - MAY_CHMOD | MAY_SET_TIMES)) { - /* File permission bits cannot grant this. */ - return -EACCES; - } - return -EAGAIN; -} - -static int check_posix_acl(struct inode *inode, int mask) -{ -#ifdef CONFIG_FS_POSIX_ACL - if (mask & MAY_NOT_BLOCK) { - struct base_acl *base_acl; - - base_acl = rcu_dereference(inode->i_acl); - if (!base_acl) - return -EAGAIN; - /* no ->get_acl() calls in RCU mode... */ - if (is_uncached_acl(base_acl)) - return -ECHILD; - return posix_acl_permission(inode, posix_acl(base_acl), - mask & ~MAY_NOT_BLOCK); - } else { - struct posix_acl *acl; - - acl = get_acl(inode, ACL_TYPE_ACCESS); - if (IS_ERR(acl)) - return PTR_ERR(acl); - if (acl) { - int error = posix_acl_permission(inode, acl, mask); - posix_acl_release(acl); - return error; - } - } -#endif - - return -EAGAIN; -} - /* * This does the basic permission checking */ @@ -344,6 +277,11 @@ static int acl_permission_check(struct inode *inode, int mask) int error = check_richacl(inode, mask); if (error != -EAGAIN) return error; + if (mask & (MAY_DELETE_SELF | MAY_TAKE_OWNERSHIP | + MAY_CHMOD | MAY_SET_TIMES)) { + /* File permission bits cannot grant this. */ + return -EACCES; + } } if (likely(uid_eq(current_fsuid(), inode->i_uid))) mode >>= 6; diff --git a/fs/posix_acl.c b/fs/posix_acl.c index f7e1a29..6415675 100644 --- a/fs/posix_acl.c +++ b/fs/posix_acl.c @@ -374,6 +374,34 @@ check_perm: return -EACCES; } +int check_posix_acl(struct inode *inode, int mask) +{ + if (mask & MAY_NOT_BLOCK) { + struct base_acl *base_acl; + + base_acl = rcu_dereference(inode->i_acl); + if (!base_acl) + return -EAGAIN; + /* no ->get_acl() calls in RCU mode... */ + if (is_uncached_acl(base_acl)) + return -ECHILD; + return posix_acl_permission(inode, posix_acl(base_acl), + mask & ~MAY_NOT_BLOCK); + } else { + struct posix_acl *acl; + + acl = get_acl(inode, ACL_TYPE_ACCESS); + if (IS_ERR(acl)) + return PTR_ERR(acl); + if (acl) { + int error = posix_acl_permission(inode, acl, mask); + posix_acl_release(acl); + return error; + } + } + return -EAGAIN; +} + /* * Modify acl when creating a new inode. The caller must ensure the acl is * only referenced once. diff --git a/fs/richacl.c b/fs/richacl.c index 1945691..ece9d0b 100644 --- a/fs/richacl.c +++ b/fs/richacl.c @@ -385,6 +385,34 @@ out: } EXPORT_SYMBOL_GPL(richacl_permission); +int check_richacl(struct inode *inode, int mask) +{ + if (mask & MAY_NOT_BLOCK) { + struct base_acl *base_acl; + + base_acl = rcu_dereference(inode->i_acl); + if (!base_acl) + return -EAGAIN; + /* no ->get_richacl() calls in RCU mode... */ + if (is_uncached_acl(base_acl)) + return -ECHILD; + return richacl_permission(inode, richacl(base_acl), + mask & ~MAY_NOT_BLOCK); + } else { + struct richacl *acl; + + acl = get_richacl(inode); + if (IS_ERR(acl)) + return PTR_ERR(acl); + if (acl) { + int error = richacl_permission(inode, acl, mask); + richacl_put(acl); + return error; + } + } + return -EAGAIN; +} + /* * Note: functions like richacl_allowed_to_who(), richacl_group_class_allowed(), * and richacl_compute_max_masks() iterate through the entire acl in reverse diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h index eafb358..07225c1 100644 --- a/include/linux/posix_acl.h +++ b/include/linux/posix_acl.h @@ -94,6 +94,7 @@ extern struct posix_acl *get_posix_acl(struct inode *, int); extern int set_posix_acl(struct inode *, int, struct posix_acl *); #ifdef CONFIG_FS_POSIX_ACL +extern int check_posix_acl(struct inode *, int); extern int posix_acl_chmod(struct inode *, umode_t); extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **, struct posix_acl **); @@ -112,6 +113,10 @@ static inline void cache_no_acl(struct inode *inode) inode->i_default_acl = NULL; } #else +static inline int check_posix_acl(struct inode *inode, int mask) { + return -EAGAIN; +} + static inline int posix_acl_chmod(struct inode *inode, umode_t mode) { return 0; diff --git a/include/linux/richacl.h b/include/linux/richacl.h index 7530920..368e918 100644 --- a/include/linux/richacl.h +++ b/include/linux/richacl.h @@ -207,4 +207,12 @@ 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 *); +#ifdef CONFIG_FS_RICHACL +extern int check_richacl(struct inode *, int); +#else +static inline int check_richacl(struct inode *inode, int mask) { + return -EAGAIN; +} +#endif /* CONFIG_FS_RICHACL */ + #endif /* __RICHACL_H */