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

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Message-ID: <20150424211511.GB28613@mail.hallyn.com>
Date:	Fri, 24 Apr 2015 16:15:11 -0500
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Christoph Lameter <cl@...ux.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	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, Apr 24, 2015 at 01:18:44PM -0700, Andy Lutomirski wrote:
> On Fri, Apr 24, 2015 at 1:13 PM, Christoph Lameter <cl@...ux.com> wrote:
> > On Fri, 24 Apr 2015, Andy Lutomirski wrote:
> >
> >> That's sort of what my patch does -- you need CAP_SETPCAP to switch
> >> the securebit.
> >>
> >> But Christoph's patch required it to add caps to the ambient set, right?
> >
> > Yes but you seem to be just adding one additional step without too much of
> > a benefit because you still need CAP_SETPCAP.
> >
> 
> No, because I set the default to on :)

Right - I definately prefer

. default off
. CAP_SETPCAP required to turn it on (for self and children)
. once on, anyone can copy bits from (whatever we decided) to pA.

> Also, in my model you can do:
> 
> $ sudo capset cap_whatever=eip something
> $ ./something
> 
> and the program can make its cap be ambient and run a helper.  In the
> CAP_SETPCAP model, that doesn't work.
> 
> --Andy
> 
> -- 
> Andy Lutomirski
> AMA Capital Management, LLC
> --
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