linux-kernel - Re: [PATCH v2 1/2] capabilities: Ambient capabilities

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Message-ID: <CALCETrW6DndOnC5ego+R5rwjoXeFo04cSO4Z2qZnhiJpEPBE=Q@mail.gmail.com>
Date:	Tue, 19 May 2015 13:07:40 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	"Ted Ts'o" <tytso@....edu>, "Andrew G. Morgan" <morgan@...nel.org>,
	Andrew Morton <akpm@...uxfoundation.org>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Linux API <linux-api@...r.kernel.org>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Aaron Jones <aaronmdjones@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Markku Savela <msa@...h.iki.fi>,
	Kees Cook <keescook@...omium.org>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v2 1/2] capabilities: Ambient capabilities

On Tue, May 19, 2015 at 1:03 PM, Christoph Lameter <cl@...ux.com> wrote:
> On Tue, 19 May 2015, Andy Lutomirski wrote:
>
>> On May 19, 2015 8:37 AM, "Christoph Lameter" <cl@...ux.com> wrote:
>> >
>> > On Mon, 18 May 2015, Andy Lutomirski wrote:
>> >
>> > > > Could you provide an example to demonstrate how it is to be used?
>> > > > Something similar to what I had in my patch?
>> > > >
>> > >
>> > > Do you mean something like:
>> > >
>> > > setpriv --ambient-caps=+net_bind_service --inh-haps=+net_bind_service
>> > > --euid=500 --ruid=500 bash
>> >
>> > Ok that means we also depend on a tool upgrade.
>> >
>>
>> I think this is unavoidable, unless we want to change the semantics of
>> inheritable caps, and that would open a giant can of worms.
>
> Ok then include a patch and references to that material. Or did I just not
> see that?
>

It's in the cover letter, rather vaguely.  I think I want to change
the setpriv syntax a bit before sending it upstream, though -- it's
sucks that you have to duplicate the option.

Perhaps the ambient-caps option should implicitly raise inheritable
caps if they're not already raised.  Or maybe the absence of an
inh-caps rule should cause any requested ambient caps to be made
inheritable as well.

--Andy
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