linux-kernel - Re: [PATCH] Make /proc/net a symlink on /proc/self/net

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Message-Id: <20080323.061650.239772151.davem@davemloft.net>
Date:	Sun, 23 Mar 2008 06:16:50 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vda.linux@...glemail.com
Cc:	xemul@...nvz.org, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com, adobriyan@...nvz.org
Subject: Re: [PATCH] Make /proc/net a symlink on /proc/self/net

From: Denys Vlasenko <vda.linux@...glemail.com>
Date: Sun, 23 Mar 2008 14:00:41 +0100

> On Wednesday 05 March 2008 13:20, Pavel Emelyanov wrote:
> > Current /proc/net is done with so called "shadows", but current
> > implementation is broken and has little chances to get fixed.
> > 
> > The problem is that dentries subtree of /proc/net directory has
> > fancy revalidation rules to make processes living in different
> > net namespaces see different entries in /proc/net subtree, but
> > currently, tasks see in the /proc/net subdir the contents of any
> > other namespace, depending on who opened the file first.
> > 
> > The proposed fix is to turn /proc/net into a symlink, which points
> > to /proc/self/net, which in turn shows what previously was in
> > /proc/net - the network-related info, from the net namespace the
> > appropriate task lives in.
> > 
> > # ls -l /proc/net
> > lrwxrwxrwx  1 root root 8 Mar  5 15:17 /proc/net -> self/net
> 
> This broke tools which read /proc/net/dev. Under non-root,
> they are no longer working. This is a regression.

This is fixed with a commit that was made yesterday.
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