linux-kernel - Re: [PATCH 1/1] simplified security.nscapability xattr

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Message-ID: <20160426194657.GA27639@ubuntu-hedt>
Date:	Tue, 26 Apr 2016 14:46:57 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	serge.hallyn@...ntu.com
Cc:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	containers@...ts.linux-foundation.org, ebiederm@...ssion.com,
	morgan@...nel.org, luto@...capital.net, keescook@...omium.org,
	jmorris@...ei.org
Subject: Re: [PATCH 1/1] simplified security.nscapability xattr

On Fri, Apr 22, 2016 at 12:26:33PM -0500, serge.hallyn@...ntu.com wrote:
> From: Serge Hallyn <serge.hallyn@...ntu.com>
> 
> This can only be set by root in his own namespace, and will
> only be respected by namespaces with that same root kuid
> mapped as root, or namespaces descended from it.
> 
> This allows a simple setxattr to work, allows tar/untar to
> work, and allows us to tar in one namespace and untar in
> another while preserving the capability, without risking
> leaking privilege into a parent namespace.
> 
> Signed-off-by: Serge Hallyn <serge.hallyn@...ntu.com>

Seems like the simplest possible design which meets the requirements.

Acked-by: Seth Forshee <seth.forshee@...onical.com>