linux-kernel - Re: [RFC] procfs: add hidepid and hidenet modes

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Date:	Sun, 12 Jun 2011 14:12:23 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nikanth Karthikesan <knikanth@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	kernel-hardening@...ts.openwall.com
Subject: Re: [RFC] procfs: add hidepid and hidenet modes

On Sun, Jun 12, 2011 at 11:51:01AM +0400, Vasiliy Kulikov wrote:
> hidenet means /proc/PID/net will be accessible to processes with
> CAP_NET_ADMIN capability or to members of a special group.
> 
> gid=XXX defines a group that will be able to gather all processes' info
> and network connections info.
> 
> Similar features are implemented for old kernels in -ow patches (for
> Linux 2.2 and 2.4) and for Linux 2.6 in -grsecurity (but both of them
> are implemented as configure options, not cofigurable in runtime).
> 
> 
> In current version hidenet works for CONFIG_NET_NS=y via creating a
> "fake" net namespace and slipping it to nonauthorized users, resulting
> in users observing blank net files (like nobody use the network).  If
> CONFIG_NET_NS=n I don't see anything better than just fully denying
> access to /proc/<pid>/net.  More elegant ideas are welcome.

This fake netns concept is ugly.
If you wan't deny something, why don't you return -E?

Regardless, these should be separate patch from PID stuff.
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