From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Smalley <sds@tycho.nsa.gov>
Subject: Re: [PATCH v2 0/7] Smack namespace
Date: Wed, 27 May 2015 09:33:25 -0400
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To: Lukasz Pawelczyk <l.pawelczyk@samsung.com>
Cc: "David S. Miller" <davem@davemloft.net>, "Eric W. Biederman" <ebiederm@xmission.com>, "Kirill A. Shutemov" <kirill@shutemov.name>, "Serge E. Hallyn" <serge@hallyn.com>, Al Viro <viro@zeniv.linux.org.uk>, Alexey Dobriyan <adobriyan@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Andy Lutomirski <luto@amacapital.net>, Casey Schaufler <casey@schaufler-ca.com>, David Howells <dhowells@redhat.com>, Fabian Frederick <fabf@skynet.be>, Greg KH <gregkh@linuxfoundation.org>, James Morris <james.l.morris@oracle.com>, Jeff Layton <jlayton@primarydata.com>, Jingoo Han <jg1.han@samsung.com>, Joe Perches <joe@perches.com>, John Johansen <john.johansen@canonical.com>, Jonathan Corbet <corbet@lwn.net>, Kees Cook <keescook@chromium.org>, Mauro Carvalho Chehab <mchehab@osg.samsung.com>, Miklos Szeredi <miklos@szeredi.hu>, Oleg Nesterov <oleg@redhat.com>, Paul Moore <paul@pa>
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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.