linux-kernel - Re: [PATCH v2 0/7] Smack namespace

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Message-ID: <5565C7A5.4060802@tycho.nsa.gov>
Date:	Wed, 27 May 2015 09:33:25 -0400
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	Lukasz Pawelczyk <l.pawelczyk@...sung.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Casey Schaufler <casey@...aufler-ca.com>,
	David Howells <dhowells@...hat.com>,
	Fabian Frederick <fabf@...net.be>,
	Greg KH <gregkh@...uxfoundation.org>,
	James Morris <james.l.morris@...cle.com>,
	Jeff Layton <jlayton@...marydata.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Joe Perches <joe@...ches.com>,
	John Johansen <john.johansen@...onical.com>,
	Jonathan Corbet <corbet@....net>,
	Kees Cook <keescook@...omium.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul Moore <paul@...l-moore.com>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Zefan Li <lizefan@...wei.com>,
	Rafal Krypa <r.krypa@...sung.com>, linux-doc@...r.kernel.org,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Lukasz Pawelczyk <havner@...il.com>
Subject: Re: [PATCH v2 0/7] Smack namespace

On 05/27/2015 05:36 AM, Lukasz Pawelczyk wrote:
> On wto, 2015-05-26 at 10:35 -0400, Stephen Smalley wrote:
>> On 05/25/2015 08:32 AM, Lukasz Pawelczyk wrote:
>>> --- Usage ---
>>>
>>> Smack namespace is written using LSM hooks inside user namespace. That
>>> means it's connected to it.
>>>
>>> To create a new Smack namespace you need to unshare() user namespace
>>> as usual. If that is all you do though, than there is no difference to
>>> what is now. To activate the Smack namespace you need to fill the
>>> labels' map. It is in a file /proc/$PID/smack_map.
>>
>> This should be /proc/$PID/attr/label_map or similar, modeled after the
>> existing /proc/$PID/attr/current and similar nodes.  Then it isn't
>> module-specific and can be reused for other modules.
> 
> To make this generic I'll have to introduce new LSH hooks to handle this
> file (much like /proc/$PID/attr/current).
> I take this is what you had in mind.

We don't have separate hooks for the
/proc/self/attr/{current,exec,fscreate,keycreate,socketcreate,prev}
nodes.  Just one hook that passes the attribute name, and then the
security hook implementation can distinguish on that.


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