linux-kernel - Re: [PATCH review 05/16] xfs: Update xfs_ioctl_setattr to handle projids in any user namespace

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Message-ID: <51F73B56.1040401@cn.fujitsu.com>
Date:	Tue, 30 Jul 2013 12:04:38 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	Dave Chinner <david@...morbit.com>
CC:	dwight.engen@...cle.com,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-fsdevel@...r.kernel.org,
	Linux Containers <containers@...ts.linux-foundation.org>,
	linux-kernel@...r.kernel.org, "Serge E. Hallyn" <serge@...lyn.com>,
	Ben Myers <bpm@....com>, Alex Elder <elder@...nel.org>,
	xfs@....sgi.com
Subject: Re: [PATCH review 05/16] xfs: Update xfs_ioctl_setattr to handle
 projids in any user namespace

On 07/30/2013 11:57 AM, Dave Chinner wrote:
> On Tue, Jul 30, 2013 at 11:15:50AM +0800, Gao feng wrote:
>> On 07/29/2013 03:51 PM, Dave Chinner wrote:
>>> http://oss.sgi.com/pipermail/xfs/2013-July/028467.html
>>>
>>> Basically, the discussion we are currently having is whether project
>>> IDs should be exposed to user namespaces at all. e.g:
>>>
>>> http://oss.sgi.com/pipermail/xfs/2013-July/028497.html
>>> http://oss.sgi.com/pipermail/xfs/2013-July/028551.html
>>>
>>> "Basically, until we have worked out *if* project quotas can be used
>>> safely within user namespaces, we need to reject any attempt to use
>>> them from within a user namespace container."
>>>
>>
>> yes, seems this v6 patchset allows user in un-init user namespace to setup proj quota
>> through ioctl, and the projid hasn't been converted to kprojid in this patchset.
>> Doesn't this will cause user in container has the ability to change the proj quota
>> which is set by root user in host?
> 
> Dwight just posted v7. can you discuss your concerns in reposnse to
> the relevant patch in that series, please? it's much easier for
> everyone if we keep the discussion int eh one thread ;)
> 

sure, I am compiling  v7 patchset now in order to confirm my misgiving :)

Thanks
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