linux-kernel - Re: [PATCH] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from granting privs

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Message-ID: <CA+55aFzRymH+QSd1wyHmGoHaQkr96myh2j7VZVXzwPOU0otJ5g@mail.gmail.com>
Date:	Fri, 13 Jan 2012 13:13:06 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Eric Paris <eparis@...hat.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	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, 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,
	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
Subject: Re: [PATCH] Add PR_{GET,SET}_NO_NEW_PRIVS to prevent execve from
 granting privs

On Fri, Jan 13, 2012 at 12:13 PM, Eric Paris <eparis@...hat.com> wrote:
>
> So you can't drop capabilities(7)?  If you come in with permission you
> can't get rid of it?  Ouch.

I really don't understand why people get confused about this.

No, you can't drop capabilities. You're in a sandbox, the whole point
is that you're running untrusted code, you had better not *have* any
capabilities that you worry about dropping.

The whole "drop capabilities" is a red herring. If you think you need
it, you're doing something wrong.

                        Linus
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