linux-kernel - Re: [capabilities] Allow normal inheritance for a configurable set of capabilities

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Date:	Wed, 25 Feb 2015 22:50:14 +0100
From:	Pavel Machek <pavel@....cz>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Serge Hallyn <serge.hallyn@...ntu.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Andy Lutomirski <luto@...capital.net>,
	Jonathan Corbet <corbet@....net>,
	Aaron Jones <aaronmdjones@...il.com>, Ted Ts'o <tytso@....edu>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, akpm@...uxfoundation.org,
	morgan@...nel.org
Subject: Re: [capabilities] Allow normal inheritance for a configurable set
 of capabilities

Hi!

> > A key concept behind posix capabilities is that the privilege comes from
> > both the person and the file being executed.  As you say below basically
> > anything can be executed by the program so that is completely violated.
> 
> Well this patch does not change that. Its just that the file being
> executed can inherit the parent caps without having to set caps in the new
> executable.
> 
> > Still, it's not that different from mmapping some arbitrary code and
> > jumping into it whlie retaining caps.
> 
> Owww. Thats a pretty far jump from what this patch does.
> 
> > Not saying this is a good idea necessarily, but worth thinking about.
> 
> Well we keep on having actual problems with caps for long years now. We
> need a solution. This means a patch that solves the issue.

One solution is to put capabilities into the elf executable. I believe
there was patch for that. That means you don't need to add capability
support into filesystems...

Old documentation is at 

http://atrey.karlin.mff.cuni.cz/~pavel/elfcap.html
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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