linux-kernel - Re: [PATCH] Document how capability bits work

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Message-ID: <20121210055753.GA3689@sergelap>
Date:	Sun, 9 Dec 2012 23:57:53 -0600
From:	Serge Hallyn <serge.hallyn@...onical.com>
To:	Rob Landley <rob@...dley.net>
Cc:	Andy Lutomirski <luto@...capital.net>,
	James Morris <james.l.morris@...cle.com>,
	linux-security-module@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>,
	linux-kernel@...r.kernel.org, Eric Paris <eparis@...hat.com>,
	"Andrew G. Morgan" <morgan@...nel.org>, mtk.manpages@...il.com
Subject: Re: [PATCH] Document how capability bits work

Quoting Rob Landley (rob@...dley.net):
> The fact that you need multiple sets of capabilities per process
> (permitted, inheritable, effective), plus MORE sets (plural) of
> capabilities attached to executable files, plus the "capability
> bounding set" which is presumably so selinux can mess with it, plus

The bounding set was in large part a workaround for the absence of the
user namespace (and, at the time, the devices cgroup).

(Now libcap-ng uses it to try and make capabilities generally easier to
use.)

-serge
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