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Message-ID: <485F0812.4090903@gmail.com>
Date: Mon, 23 Jun 2008 11:18:58 +0900
From: Tejun Heo <htejun@gmail.com>
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To: Benjamin Thery <benjamin.thery@bull.net>
CC: Greg Kroah-Hartman <gregkh@suse.de>,
       Andrew Morton <akpm@linux-foundation.org>,
       Eric Biederman <ebiederm@xmission.com>,
       Daniel Lezcano <dlezcano@fr.ibm.com>, Serge Hallyn <serue@us.ibm.com>,
       linux-kernel@vger.kernel.org, Al Viro <viro@ftp.linux.org.uk>,
       Linux Containers <containers@lists.osdl.org>
Subject: Re: [PATCH 11/11] sysfs: user namespaces: fix bug with clone(CLONE_NEWUSER)
 with fairsched
References: <20080618170729.808539948@theryb.frec.bull.fr> <20080618170731.746054454@theryb.frec.bull.fr>
In-Reply-To: <20080618170731.746054454@theryb.frec.bull.fr>
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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@us.ibm.com>
> Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>

Ditto as patch #10.

Thanks.

-- 
tejun