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

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Message-ID: <20150226122707.GA27733@Nokia-N900>
Date:	Thu, 26 Feb 2015 13:27:07 +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

On Wed 2015-02-25 17:59:04, Christoph Lameter wrote:
> On Wed, 25 Feb 2015, Pavel Machek wrote:
> 
> > 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...
> 
> Ummm... So I can just get any caps by modifying the ELF header?
> Looking at the docs No, it just drops caps so binaries must be
> setsuid.

exactly. Normal apps are not currently allowed to receive 
capabilities, because they may not be ready for them.

So add an elf note marking what capabilities it can deal with.
No need for setuid if caller has the capabilities already.

						Pavel

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