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Message-ID: <20150828203452.GA23326@fieldses.org>
Date: Fri, 28 Aug 2015 16:34:52 -0400
From: bfields@...ldses.org (J. Bruce Fields)
To: Andreas Gruenbacher <andreas.gruenbacher@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-nfs@...r.kernel.org, linux-api@...r.kernel.org,
linux-cifs@...r.kernel.org, linux-security-module@...r.kernel.org,
Andreas Gruenbacher <agruenba@...hat.com>
Subject: Re: [RFC v6 01/40] vfs: Add IS_ACL() and IS_RICHACL() tests
On Tue, Aug 04, 2015 at 01:52:59PM +0200, Andreas Gruenbacher wrote:
> 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 by file systems that specifically support POSIX ACLs,
> like nfsd.
Nit: nfsd's not a filesystem. Maybe just list the users instead.
--b.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
> ---
> fs/Kconfig | 3 +++
> fs/namei.c | 8 ++++----
> include/linux/fs.h | 12 ++++++++++++
> include/uapi/linux/fs.h | 3 ++-
> 4 files changed, 21 insertions(+), 5 deletions(-)
>
> diff --git a/fs/Kconfig b/fs/Kconfig
> index 011f433..3e09c06 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -59,6 +59,9 @@ 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 fbbcf09..8f3db24 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -2771,7 +2771,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
> }
>
> mode = op->mode;
> - if ((open_flag & O_CREAT) && !IS_POSIXACL(dir))
> + if ((open_flag & O_CREAT) && !IS_ACL(dir))
> mode &= ~current_umask();
>
> excl = (open_flag & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT);
> @@ -2955,7 +2955,7 @@ static int lookup_open(struct nameidata *nd, struct path *path,
> /* Negative dentry, just create the file */
> if (!dentry->d_inode && (op->open_flag & O_CREAT)) {
> umode_t mode = op->mode;
> - if (!IS_POSIXACL(dir->d_inode))
> + if (!IS_ACL(dir->d_inode))
> mode &= ~current_umask();
> /*
> * This write is needed to ensure that a
> @@ -3526,7 +3526,7 @@ retry:
> 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)
> @@ -3595,7 +3595,7 @@ retry:
> 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 cc008c3..44e696e 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1770,6 +1770,12 @@ 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)
> @@ -1783,6 +1789,12 @@ struct super_operations {
> (inode)->i_rdev == WHITEOUT_DEV)
>
> /*
> + * 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 9b964a5..6ac6bc9 100644
> --- a/include/uapi/linux/fs.h
> +++ b/include/uapi/linux/fs.h
> @@ -81,7 +81,7 @@ 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 */
> @@ -91,6 +91,7 @@ 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_NOSEC (1<<28)
> --
> 2.5.0
>
> --
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