linux-kernel - Re: [PATCH v18 00/22] Richacls (Core and Ext4)

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Message-ID: <20160315071439.GE19747@infradead.org>
Date:	Tue, 15 Mar 2016 00:14:39 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Steve French <smfrench@...il.com>
Cc:	Andreas Gruenbacher <agruenba@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	Theodore Ts'o <tytso@....edu>,
	"linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	LKML <linux-kernel@...r.kernel.org>,
	XFS Developers <xfs@....sgi.com>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	Anna Schumaker <anna.schumaker@...app.com>
Subject: Re: [PATCH v18 00/22] Richacls (Core and Ext4)

On Fri, Mar 11, 2016 at 02:05:16PM -0600, Steve French wrote:
> A loosely related question is what can be done for tools around existing
> interfaces for ACLs.  I recently found out NTFS-3g has this xattr:
> 
>     static const char nf_ns_xattr_ntfs_acl[] = "system.ntfs_acl";
> 
> which allows you to query system.ntfs_acl xattr to get their full ACL

Bah.  Filesystems really have no business exposing random system xattrs,
and we really need to add a filter to fs/xattr.c to not expose
arbitrary attrs ouside the user.* prefix.