linux-kernel - Re: [REVIEW][PATCH 1/2] userns: Better restrictions on when proc and sysfs can be mounted

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Date:	Tue, 27 Aug 2013 14:57:05 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Linux Containers <containers@...ts.linux-foundation.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [REVIEW][PATCH 1/2] userns: Better restrictions on when proc and sysfs can be mounted

Andy Lutomirski <luto@...capital.net> writes:

> On Tue, Aug 27, 2013 at 2:44 PM, Eric W. Biederman
> <ebiederm@...ssion.com> wrote:
>>
>> Rely on the fact that another flavor of the filesystem is already
>> mounted and do not rely on state in the user namespace.
>
> Possibly dumb question: does this check whether the pre-existing mount
> has hidepid set?

Not currently. 

It may be worth doing something with respect to hidepid.  I forget what
hidepid tries to do, and I need to dash.  But feel free to cook up a
follow on patch.

My goal is simply to reduce the hack level and increase the readability
and maintainability of the code.

Eric
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