linux-kernel - Re: [PATCH 2/9] syslog_ns: add syslog_ns into user

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Message-ID: <51F639FB.304@cn.fujitsu.com>
Date:	Mon, 29 Jul 2013 17:46:35 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Rui Xiang <rui.xiang@...wei.com>
CC:	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, serge.hallyn@...ntu.com,
	ebiederm@...ssion.com, akpm@...ux-foundation.org,
	gaofeng@...fujitsu.com, libo.chen@...wei.com
Subject: Re: [PATCH 2/9] syslog_ns: add syslog_ns into user_namespace

Hi Rui,

On 07/29/2013 10:31 AM, Rui Xiang wrote:

> Add a syslog_ns pointer to user_namespace, and make
> syslog_ns per user_namespace, not global.
> 
> Since syslog_ns is assigned to user_ns, we can have
> full capabilities in new user_ns to create a new syslog_ns.
> 
> Signed-off-by: Rui Xiang <rui.xiang@...wei.com>
> ---
>  include/linux/syslog.h         | 5 +++++
>  include/linux/user_namespace.h | 1 +
>  2 files changed, 6 insertions(+)
> 
> diff --git a/include/linux/syslog.h b/include/linux/syslog.h
> index 425fafe..62ce47f 100644
> --- a/include/linux/syslog.h
> +++ b/include/linux/syslog.h
> @@ -90,6 +90,11 @@ struct syslog_namespace {
>  	size_t syslog_partial;
>  
>  	int dmesg_restrict;
> +
> +	/*
> +	 * user namespace which owns this syslog ns.
> +	 */
> +	struct user_namespace *owner;
>  };
>  
>  static inline struct syslog_namespace *get_syslog_ns(
> diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
> index b6b215f..ce2de5b 100644
> --- a/include/linux/user_namespace.h
> +++ b/include/linux/user_namespace.h
> @@ -28,6 +28,7 @@ struct user_namespace {
>  	unsigned int		proc_inum;
>  	bool			may_mount_sysfs;
>  	bool			may_mount_proc;
> +	struct syslog_namespace *syslog_ns;

As we add a syslog_ns pointer to user_namespace to make
syslog_ns per user_namespace and the caps check.
But why also add a point to syslog_namespace in
user_namespace? Am I missing something?:)

Thanks,
Gu

>  };
>  
>  extern struct user_namespace init_user_ns;


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