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

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Message-ID: <alpine.DEB.2.11.1504241424330.11285@gentwo.org>
Date:	Fri, 24 Apr 2015 14:25:46 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Serge Hallyn <serge.hallyn@...ntu.com>
cc:	Andy Lutomirski <luto@...capital.net>,
	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 Fri, 24 Apr 2015, Serge Hallyn wrote:

> > I object because CAP_SETPCAP is very powerful whereas
> > CAP_NET_BIND_SERVICE, for example, isn't.  I'm fine with having a
> > switch to turn off ambient caps, but requiring the "on" state to give
>
> Would only really be needed for the initial 'enable ambient caps for this
> process tree', though.  Once that was set, add/remove'ing caps from the
> ambient set wouldn't need to be required.

Exactly. Its much simpler than alternate approaches. And its convoluted
enough.

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