linux-kernel - Re: [RFC] capabilities: Ambient capabilities

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Message-ID: <alpine.DEB.2.11.1503301003460.6781@gentwo.org>
Date:	Mon, 30 Mar 2015 10:05:58 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Andy Lutomirski <luto@...capital.net>
cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Andrew Lutomirski <luto@...nel.org>, Ted Ts'o <tytso@....edu>,
	Andrew Morton <akpm@...uxfoundation.org>,
	"Andrew G. Morgan" <morgan@...nel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Aaron Jones <aaronmdjones@...il.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Markku Savela <msa@...h.iki.fi>,
	Kees Cook <keescook@...omium.org>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [RFC] capabilities: Ambient capabilities

On Mon, 30 Mar 2015, Andy Lutomirski wrote:

> > Would this suffice? It puts the CAP_SETPCAP limitation back to how it
> > was in my earlier patch.
> I really don't like that variant.  CAP_SETPCAP is dangerous and so
> absurdly powerful that people really shouldn't hand it out.

According to

	man 7 capabilities

CAP_SETPCAP is required to setup securebits.

This hides the functionality behind yet another stage of security and
obscures this ability somewhat more?
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