linux-kernel - Re: [PATCH 11/11] sysfs: user namespaces: fix bug with clone(CLONE

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Date:	Mon, 23 Jun 2008 11:18:58 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Benjamin Thery <benjamin.thery@...l.net>
CC:	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Serge Hallyn <serue@...ibm.com>, linux-kernel@...r.kernel.org,
	Al Viro <viro@....linux.org.uk>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [PATCH 11/11] sysfs: user namespaces: fix bug with clone(CLONE_NEWUSER)
 with fairsched

Benjamin Thery wrote:
> Mark the /sys/kernel/uids directory to be tagged so that processes in
> different user namespaces can remount /sys and see their own uid
> listings.
> 
> Without this patch, having CONFIG_FAIR_SCHED=y makes user namespaces
> unusable, because when you 
>   clone(CLONE_NEWUSER)
> it will auto-create the root userid and try to create
> /sys/kernel/uids/0.  Since that already exists from the parent user
> namespace, the create fails, and the clone misleadingly ends up
> returning -ENOMEM.
> 
> This patch fixes the issue by allowing each user namespace to remount
> /sys, and having /sys filter the /sys/kernel/uid/ entries by user
> namespace.
> 
> Signed-off-by: Serge Hallyn <serue@...ibm.com>
> Signed-off-by: Benjamin Thery <benjamin.thery@...l.net>

Ditto as patch #10.

Thanks.

-- 
tejun
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