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

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Message-ID: <20100421102739.6ad932fb@lxorguk.ukuu.org.uk>
Date:	Wed, 21 Apr 2010 10:27:39 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	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>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-api@...r.kernel.org, Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH 3/3] p9auth: add p9auth driver

> This is a change which must be discussed.  The use of this
> privilege can be completely prevented by having init remove
> CAP_GRANT_ID from its capability bounding set before forking any
> processes.

Which is a minor back compat issue - but you could start without it and
allow init to add it.

It seems a very complex interface to do a simple thing. A long time ago
there was discussion around extending the AF_UNIX fd passing to permit
'pass handle and auth' so you could send someone a handle with a "become
me" token attached.

Alan
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