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

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Date:	Wed, 21 Apr 2010 12:15:27 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Serge E. Hallyn" <serue@...ibm.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

"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.

Eric
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