linux-kernel - Re: [PATCH 3/3] p9auth: add p9auth driver

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Date:	Wed, 21 Apr 2010 15:23:25 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	lkml <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	Ashwin Ganti <ashwin.ganti@...il.com>,
	Greg KH <greg@...ah.com>, rsc@...ch.com, ericvh@...il.com,
	linux-security-module@...r.kernel.org,
	Ron Minnich <rminnich@...il.com>, jt.beard@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrew Morgan <morgan@...nel.org>, oleg@...ibm.com,
	Eric Paris <eparis@...hat.com>, linux-api@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH 3/3] p9auth: add p9auth driver

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> "Serge E. Hallyn" <serue@...ibm.com> writes:
> 
> > Ignoring namespaces for a moment, I guess we could do something like
> >
> > struct credentials_pass {
> > 	pid_t global_pid;
> > 	unsigned long unique_id;
> > 	uid_t new_uid;
> > 	gid_t new_gid;
> > 	int num_aux_gids;
> > 	gid_t aux_gids[];
> > }
> 
> This looks surprising like what I am doing in passing uids and pids
> through unix domain sockets.
> 
> So if this looks like a direction we want to go it shouldn't be too
> difficult.
> 
> >> That also btw needs fixing for other reasons - more than one daemon has
> >> been written that generically uses recvmsg and so can be attacked with FD
> >> leaks >-)
> >
> > Yup.
> >
> > (By 'needs fixing' you just mean needs to be done right for this
> > service?  Else I think I'm missing something...)
> 
> Remember my unix domain socket and the patch for converting struct cred
> into a new context, from a month or so ago.  I think that is what we
> are talking about.

Zoinks!  After some digging I found it in my containers.mbox and at
https://lists.linux-foundation.org/pipermail/containers/2010-March/023405.html
and see you even called me out.  Sorry!  I see your tree at
http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/ebiederm/linux-2.6.33-nsfd-v5.git;a=summary
and commit "af_unix: Allow SO_PEERCRED to work across namespaces", and
it all looks good.  Definately useful for a SO_PASSCRED or somesuch
implementation.

thanks,
-serge
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