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

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Date:	Mon, 29 Jul 2013 17:56:27 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Gao feng <gaofeng@...fujitsu.com>
CC:	Rui Xiang <rui.xiang@...wei.com>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, serge.hallyn@...ntu.com,
	ebiederm@...ssion.com, akpm@...ux-foundation.org,
	libo.chen@...wei.com
Subject: Re: [PATCH 2/9] syslog_ns: add syslog_ns into user_namespace

On 07/29/2013 05:54 PM, Gao feng wrote:

> On 07/29/2013 05:46 PM, Gu Zheng wrote:
>> 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?:)
>>
> 
> yep,with this we can make sure all the other types of namespace such as mount, net, pid
> can access syslog_ns through user namespace.

Got it.:)

Thanks,
Gu

> 
> 


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