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

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Message-ID: <CALCETrUrFm9n_4xTj4ELkzTSnWHfxQtANqz2wpzU7riTihLDaA@mail.gmail.com>
Date:	Fri, 24 Apr 2015 13:18:44 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Christoph Lameter <cl@...ux.com>
Cc:	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 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 :)

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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