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

To: Steve French <smfrench@xxxxxxxxx>
Subject: Re: [PATCH v18 00/22] Richacls (Core and Ext4)
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 15 Mar 2016 00:14:39 -0700
Cc: Andreas Gruenbacher <agruenba@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, "J. Bruce Fields" <bfields@xxxxxxxxxxxx>, Linux NFS Mailing List <linux-nfs@xxxxxxxxxxxxxxx>, Theodore Ts'o <tytso@xxxxxxx>, "linux-cifs@xxxxxxxxxxxxxxx" <linux-cifs@xxxxxxxxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, XFS Developers <xfs@xxxxxxxxxxx>, Andreas Dilger <adilger.kernel@xxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxxxxxxx>, linux-ext4 <linux-ext4@xxxxxxxxxxxxxxx>, Anna Schumaker <anna.schumaker@xxxxxxxxxx>
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References: <1456733847-17982-1-git-send-email-agruenba@xxxxxxxxxx> <20160311140134.GA14808@xxxxxxxxxxxxx> <CAHc6FU4t3yisCM=MXrHRmCja_A8eZOpVa1smJ0gUhv+vuUAuXA@xxxxxxxxxxxxxx> <CAH2r5mv3OTmPOQBV7xc-uZmB0gWxykXOCEVOcybx3tbHiViTZg@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.24 (2015-08-30)
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.

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