linux-kernel - Re: [PATCH 0/5] Make /sys/class/net per net namespace objects belong to container

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Message-Id: <20160821.234139.1856651235617174329.davem@davemloft.net>
Date:   Sun, 21 Aug 2016 23:41:39 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dmitry.torokhov@...il.com
Cc:     tj@...nel.org, ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 0/5] Make /sys/class/net per net namespace objects
 belong to container

From: Dmitry Torokhov <dmitry.torokhov@...il.com>
Date: Tue, 16 Aug 2016 15:33:10 -0700

> There are objects in /sys hierarchy (/sys/class/net/) that logically belong
> to a namespace/container. Unfortunately all sysfs objects start their life
> belonging to global root, and while we could change ownership manually,
> keeping tracks of all objects that come and go is cumbersome. It would
> be better if kernel created them using correct uid/gid from the beginning.
> 
> This series changes kernfs to allow creating object's with arbitrary
> uid/gid, adds get_ownership() callback to ktype structure so subsystems
> could supply their own logic (likely tied to namespace support) for
> determining ownership of kobjects, and adjusts sysfs code to make use of
> this information. Lastly net-sysfs is adjusted to make sure that objects in
> net namespace are owned by the root user from the owning user namespace.
> 
> Note that we do not adjust ownership of objects moved into a new namespace
> (as when moving a network device into a container) as userspace can easily
> do it.

As shown by the kbuild robot, this fails to build when CONFIG_SYSFS
it disabled.