netdev - Re: [RFC][PATCH v3] Unprivileged: Disable raising of privileges

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Date:	Thu, 31 Dec 2009 17:06:41 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Peter Dolding <oiaohm@...il.com>
Cc:	Samir Bellabes <sam@...ack.fr>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	"Andrew G. Morgan" <morgan@...nel.org>,
	Bryan Donlan <bdonlan@...il.com>,
	Benny Amorsen <benny+usenet@...rsen.dk>,
	Michael Stone <michael@...top.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>, David Lang <david@...g.hm>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Evgeniy Polyakov <zbr@...emap.net>,
	"C. Scott Ananian" <cscott@...ott.net>,
	James Morris <jmorris@...ei.org>,
	Bernie Innocenti <bernie@...ewiz.org>,
	Mark Seaborn <mrs@...hic-beasts.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Pavel Machek <pavel@....cz>, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC][PATCH v3] Unprivileged: Disable raising of privileges

> Lets step back for a moment.  What is the common issue with both.
> 
> The issue is simple.  "How to I generically tell the secuirty system
> want particular restrictions."

You don't. It's not "the security system", its a whole collection of
completely different models of security and differing tools.

> There is no generic LSM API for application or users to talk to the
> LSM and say I want the following restricted.

That's a meaningless observation I think because security doesn't work
that way. Removing specific features from a specific piece of code
generally isn't a security feature - its only meaningful in the context
of a more general policy and that policy expression isn't generic.

> To control the LSM the applications are expected to know what the LSM.
>  This has caused items like chrome major issues.

..

> Application does not need to be informed what is disabled from it.

So why does it cause chrome problems ?


There are multiple security models because nobody can agree on what they
should look like, just like multiple desktops. Each of them is based on a
totally different conceptual model so the idea of a single interface to
them is a bit meaningless.

Alan
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