linux-kernel - Re: [PATCH 5/9] user namespace: clamp down users of cap

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Message-ID: <14652.1319014868@redhat.com>
Date:	Wed, 19 Oct 2011 10:01:08 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Andrew G. Morgan" <morgan@...nel.org>
Cc:	dhowells@...hat.com, Serge Hallyn <serge@...lyn.com>,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	akpm@...ux-foundation.org, oleg@...hat.com, richard@....at,
	mikevs@...all.net, segoon@...nwall.com, gregkh@...e.de,
	eparis@...hat.com, "Serge E. Hallyn" <serge.hallyn@...onical.com>
Subject: Re: [PATCH 5/9] user namespace: clamp down users of cap_raised


> #define NS_IS_NON_DEFAULT (current_user_ns() != &init_user_ns)

How about:

	#define IN_ROOT_USER_NS (current_user_ns() == &init_user_ns)

And then:

	if (!IN_ROOT_USER_NS() || !cap_raised(current_cap(), CAP_SYS_ADMIN)) {

I think it reads better.

David
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