linux-kernel - Re: [PATCH 6/8] cgroup: mount cgroupns-root when inside non-init cgroupns

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Date:	Fri, 1 Jan 2016 10:17:03 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	"Serge E. Hallyn" <serge.hallyn@...ntu.com>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-api@...r.kernel.org, containers@...ts.linux-foundation.org,
	hannes@...xchg.org, linux-kernel@...r.kernel.org,
	linux-next@...r.kernel.org, ebiederm@...ssion.com,
	lxc-devel@...ts.linuxcontainers.org, gregkh@...uxfoundation.org,
	tj@...nel.org, cgroups@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 6/8] cgroup: mount cgroupns-root when inside non-init
 cgroupns

On (12/31/15 18:58), Serge E. Hallyn wrote:
[..]
> Thanks!  Following trivial patch should fix this:

confirmed, thanks!

Tested-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

	-ss

> From fc54592077533ff2ff90ed54b72bf03b4378ca9f Mon Sep 17 00:00:00 2001
> From: Serge Hallyn <serge.hallyn@...ntu.com>
> Date: Thu, 31 Dec 2015 16:55:19 -0800
> Subject: [PATCH 1/1] cgroup_release_agent: grab css_set_lock around
>  cgroup_path()
> 
> Reported-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Signed-off-by: Serge Hallyn <serge.hallyn@...ntu.com>
> ---
>  kernel/cgroup.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 4812f59..d10f127 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -5769,7 +5769,9 @@ static void cgroup_release_agent(struct work_struct *work)
>  	if (!pathbuf || !agentbuf)
>  		goto out;
>  
> +	spin_lock_bh(&css_set_lock);
>  	path = cgroup_path(cgrp, pathbuf, PATH_MAX);
> +	spin_unlock_bh(&css_set_lock);
>  	if (!path)
>  		goto out;
>  
> -- 
> 2.5.0
> 
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