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

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Message-ID: <CALCETrWRHRVLotFs=Cpdr=7KjE7q52NdT62GxZg=xjv+LFZBqw@mail.gmail.com>
Date:	Sat, 14 Mar 2015 15:55:24 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"Andrew G. Morgan" <morgan@...nel.org>
Cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	"Ted Ts'o" <tytso@....edu>, Andrew Lutomirski <luto@...nel.org>,
	Andrew Morton <akpm@...uxfoundation.org>,
	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>,
	Christoph Lameter <cl@...ux.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: [RFC] capabilities: Ambient capabilities

It occurs to me that my previous reply was unnecessarily long and
missed the point.  Trying again:

On Sat, Mar 14, 2015 at 3:17 PM, Andrew G. Morgan <morgan@...nel.org> wrote:
> On Sat, Mar 14, 2015 at 2:45 PM, Andy Lutomirski <luto@...capital.net> wrote:
>> On Sat, Mar 14, 2015 at 2:09 PM, Andrew G. Morgan <morgan@...nel.org> wrote:
>>> My Nack remains that you are eliminating the explicit enforcement of
>>> selective inheritance. A lockable secure bit protecting access to your
>>> prctl() function would address this concern.
>>
>> Would a sysctl or securebit that *optionally* allows pA to be disabled
>> satisfy you?

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

It would be kind of nice to remove your nack.  I think that the above
is the relevant question.  Could you answer it?

--Andy
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