linux-kernel - Re: [PATCH PLACEHOLDER 1/3] fs/exec: "always

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Date:	Thu, 12 Jan 2012 15:47:48 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Will Drewry <wad@...omium.org>
Cc:	linux-kernel@...r.kernel.org, keescook@...omium.org,
	john.johansen@...onical.com, serge.hallyn@...onical.com,
	coreyb@...ux.vnet.ibm.com, pmoore@...hat.com, eparis@...hat.com,
	djm@...drot.org, segoon@...nwall.com, rostedt@...dmis.org,
	jmorris@...ei.org, scarybeasts@...il.com, avi@...hat.com,
	penberg@...helsinki.fi, viro@...iv.linux.org.uk, luto@....edu,
	mingo@...e.hu, akpm@...ux-foundation.org, khilman@...com,
	borislav.petkov@....com, amwang@...hat.com, oleg@...hat.com,
	ak@...ux.intel.com, eric.dumazet@...il.com, gregkh@...e.de,
	dhowells@...hat.com, daniel.lezcano@...e.fr,
	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, olofj@...omium.org,
	mhalcrow@...gle.com, dlaor@...hat.com, corbet@....net,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH PLACEHOLDER 1/3] fs/exec: "always_unprivileged" patch

On Thu, Jan 12, 2012 at 3:38 PM, Will Drewry <wad@...omium.org> wrote:
> This patch is a placeholder until Andy's (luto@....edu) patch arrives
> implementing Linus's proposal for applying a "this is a process that has
> *no* extra privileges at all, and can never get them".

I think we can simplify and improve the naming/logic by just saying
"can't change privileges".

I'd argue that that even includes "can't drop them", just to make it
really clear what the rules are.

So the usage model would be to first simply set the privileges to
whatever you want the sandbox to be, and then enter the restricted
mode.

                    Linus
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