Re: [PATCH 11/11] sysfs: user namespaces: fix bug with clone(CLONE_NEWUSER)with fairsched

[Tejun Heo]

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@xxxxxxxxxx>
> Signed-off-by: Benjamin Thery <benjamin.thery@xxxxxxxx>

Ditto as patch #10.

Thanks.

-- 
tejun
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