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

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Message-ID: <CAObL_7FErN5CHmfSehJYcM0_Lz-WTywG7cHe2jZyQbf-GkOQjg@mail.gmail.com>
Date:	Thu, 12 Jan 2012 16:42:02 -0800
From:	Andrew Lutomirski <luto@....edu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Will Drewry <wad@...omium.org>, 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, 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 3:47 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> 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.

That may prevent another use: set this new flag, chroot, drop
privileges, accept network connections.  (The idea being that chroot
might work unprivileged if this flag is set.)

--Andy
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