linux-kernel - Re: [PATCH v11 21/48] ext4: Add richacl feature flag

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Message-ID: <CAHc6FU4CVQAn6TCQzC8r9m9URmqD_eHQBwhDK2o_o4eb3myW=A@mail.gmail.com>
Date:	Mon, 19 Oct 2015 17:34:54 +0200
From:	Andreas Gruenbacher <agruenba@...hat.com>
To:	Austin S Hemmelgarn <ahferroin7@...il.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Dave Chinner <david@...morbit.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>, xfs@....sgi.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	linux-cifs@...r.kernel.org, Linux API <linux-api@...r.kernel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v11 21/48] ext4: Add richacl feature flag

On Mon, Oct 19, 2015 at 3:16 PM, Austin S Hemmelgarn
<ahferroin7@...il.com> wrote:
> On 2015-10-16 13:41, Andreas Gruenbacher wrote:
>>
>> On Fri, Oct 16, 2015 at 7:31 PM, Austin S Hemmelgarn
>> <ahferroin7@...il.com> wrote:
>>>
>>> I would like to re-iterate, on both XFS and ext4, I _really_ think this
>>> should be a ro_compat flag, and not an incompat one.  If a person has the
>>> ability to mount the FS (even if it's a read-only mount), then they by
>>> definition have read access to the file or partition that the filesystem
>>> is contained in, which means that any ACL's stored on the filesystem are
>>> functionally irrelevant,
>>
>> It is unfortunately not safe to make such a file system accessible to
>> other users, so the feature is not strictly read-only compatible.
>>
> OK, seeing as I wasn't particularly clear as to why I object to this in my
> other e-mail, let's try this again.
>
> Can you please explain exactly why it isn't safe to make such a filesystem
> accessible to other users?

See here: http://www.spinics.net/lists/linux-ext4/msg49541.html

Andreas
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