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

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Message-ID: <CALCETrW5_85mFFTkzCVNA5N1KQeNBrkw2d8FF3H3LYtmz6UAPw@mail.gmail.com>
Date:	Fri, 24 Apr 2015 11:41:39 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Serge Hallyn <serge.hallyn@...ntu.com>
Cc:	Christoph Lameter <cl@...ux.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 10:53 AM, Serge Hallyn <serge.hallyn@...ntu.com> wrote:
> Quoting Christoph Lameter (cl@...ux.com):
>> On Thu, 9 Apr 2015, Christoph Lameter wrote:
>>
>> > > I'll submit a new version this week with the securebits.  Sorry for the delay.
>>  > Are we going to get a new version?
>>
>> Replying to my own here. Cant we simply use the SETPCAP approach as per
>> the patch I posted?
>
> Andy had objections to that, but it seems ok to me.
>

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
processes superpowers seems unfortunate.

Sorry for the huge delay.  I got caught up with travel and the merge
window.  Here's a sneak peek:

https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/log/?h=cap_ambient

I need to write the user code to go with it and test it a bit before
sending it out for real.

--Andy
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