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

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Message-Id: <200803231400.41397.vda.linux@googlemail.com>
Date:	Sun, 23 Mar 2008 14:00:41 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...nvz.org>
Subject: Re: [PATCH] Make /proc/net a symlink on /proc/self/net

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.
--
vda
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