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

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Message-ID: <alpine.DEB.2.11.1502041210170.17031@gentwo.org>
Date:	Wed, 4 Feb 2015 12:12:04 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	"Serge E. Hallyn" <serge@...lyn.com>
cc:	"Andrew G. Morgan" <morgan@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Jonathan Corbet <corbet@....net>,
	Aaron Jones <aaronmdjones@...il.com>, Ted Ts'o <tytso@....edu>,
	LSM List <linux-security-module@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...uxfoundation.org>
Subject: Re: [capabilities] Allow normal inheritance for a configurable set
 of capabilities

On Wed, 4 Feb 2015, Serge E. Hallyn wrote:

> Ok this is all sounding too magic for my tastes.  My original suggestion
> was for an actual new capability set, pA, empty by default.  You can
> add bits to it using prctl if ns_capable(CAP_SETPCAP) and all the new bits are
> in your pE.  Once set, they stay until they are removed using prctl.  At
> exec, pA' = pA, and fI |= pA (after reading fI from disk but before
> calculating pI').

Sounds good. I think we cannot avoid the additional capability set in the
cred structure since otherwise the regular ("crippled") inheritance bits
may be modified and then not passed on correctly.

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