Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:44730 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752738AbcJKMvJ (ORCPT ); Tue, 11 Oct 2016 08:51:09 -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 v27 01/21] vfs: Add IS_ACL() and IS_RICHACL() tests Date: Tue, 11 Oct 2016 14:50:36 +0200 Message-Id: <1476190256-1677-2-git-send-email-agruenba@redhat.com> In-Reply-To: <1476190256-1677-1-git-send-email-agruenba@redhat.com> References: <1476190256-1677-1-git-send-email-agruenba@redhat.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: The vfs does not apply the umask for file systems that support acls. The test used for this used to be called IS_POSIXACL(). Switch to a new IS_ACL() test to check for either posix acls or richacls instead. Add a new MS_RICHACL flag and IS_RICHACL() test for richacls alone. The IS_POSIXACL() test is still needed in some places like nfsd. Signed-off-by: Andreas Gruenbacher Reviewed-by: J. Bruce Fields Reviewed-by: Andreas Dilger Reviewed-by: Steve French Reviewed-by: Jeff Layton --- fs/Kconfig | 3 +++ fs/namei.c | 6 +++--- include/linux/fs.h | 12 ++++++++++++ include/uapi/linux/fs.h | 3 ++- 4 files changed, 20 insertions(+), 4 deletions(-) diff --git a/fs/Kconfig b/fs/Kconfig index 4bd03a2..00c6865 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -67,6 +67,9 @@ endif # BLOCK config FS_POSIX_ACL def_bool n +config FS_RICHACL + def_bool n + config EXPORTFS tristate diff --git a/fs/namei.c b/fs/namei.c index a7f601c..33bdea7 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3129,7 +3129,7 @@ static int lookup_open(struct nameidata *nd, struct path *path, * O_EXCL open we want to return EEXIST not EROFS). */ if (open_flag & O_CREAT) { - if (!IS_POSIXACL(dir->d_inode)) + if (!IS_ACL(dir->d_inode)) mode &= ~current_umask(); if (unlikely(!got_write)) { create_error = -EROFS; @@ -3723,7 +3723,7 @@ SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode, if (IS_ERR(dentry)) return PTR_ERR(dentry); - if (!IS_POSIXACL(path.dentry->d_inode)) + if (!IS_ACL(path.dentry->d_inode)) mode &= ~current_umask(); error = security_path_mknod(&path, dentry, mode, dev); if (error) @@ -3794,7 +3794,7 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode) if (IS_ERR(dentry)) return PTR_ERR(dentry); - if (!IS_POSIXACL(path.dentry->d_inode)) + if (!IS_ACL(path.dentry->d_inode)) mode &= ~current_umask(); error = security_path_mkdir(&path, dentry, mode); if (!error) diff --git a/include/linux/fs.h b/include/linux/fs.h index c145219..b88225a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1867,6 +1867,12 @@ struct super_operations { #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) +#ifdef CONFIG_FS_RICHACL +#define IS_RICHACL(inode) __IS_FLG(inode, MS_RICHACL) +#else +#define IS_RICHACL(inode) 0 +#endif + #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) @@ -1885,6 +1891,12 @@ static inline bool HAS_UNMAPPED_ID(struct inode *inode) } /* + * IS_ACL() tells the VFS to not apply the umask + * and use check_acl for acl permission checks when defined. + */ +#define IS_ACL(inode) __IS_FLG(inode, MS_POSIXACL | MS_RICHACL) + +/* * Inode state bits. Protected by inode->i_lock * * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 2473272..0514d90 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -120,7 +120,7 @@ struct inodes_stat_t { #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. MS_VERBOSE is deprecated. */ #define MS_SILENT 32768 -#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ +#define MS_POSIXACL (1<<16) /* Supports POSIX ACLs */ #define MS_UNBINDABLE (1<<17) /* change to unbindable */ #define MS_PRIVATE (1<<18) /* change to private */ #define MS_SLAVE (1<<19) /* change to slave */ @@ -130,6 +130,7 @@ struct inodes_stat_t { #define MS_I_VERSION (1<<23) /* Update inode I_version field */ #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ #define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ +#define MS_RICHACL (1<<26) /* Supports richacls */ /* These sb flags are internal to the kernel */ #define MS_NOREMOTELOCK (1<<27) -- 2.7.4