linux-kernel - Re: [PATCH] userns: initialize the depth of user

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Message-ID: <520C33FA.5080603@huawei.com>
Date:	Thu, 15 Aug 2013 09:50:50 +0800
From:	Rui Xiang <rui.xiang@...wei.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Andy Lutomirski <luto@...capital.net>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] userns: initialize the depth of user_namespace chain

On 2013/8/15 2:43, Oleg Nesterov wrote:
> On 08/14, Rui Xiang wrote:
>>
>> On 2013/8/14 13:06, Andy Lutomirski wrote:
>>> On Tue, Aug 13, 2013 at 10:04 PM, Rui Xiang <rui.xiang@...wei.com> wrote:
>>>> The level of init_user_ns shoule be 1.
>>>
>>> What's wrong with zero?
>>>
>>
>> No problem. It is just consistent with commit 8742f229b63, IMHO.
> 
> Well, I am fine either way,
> 
>> but the initialization of level should be necessary.
> 
> but it is not necessary. This is just an "arbitrary" limit for now,
> 32 non-root namespaces. Perhaps we should count init_user_ns too.
> 
> Hmm. but I just realized that "> 32" in create_user_ns() should be
> ">= 32" in this case.
> 
Yes. If we need to count init_user_ns, this filed should be set to 1 in 
init_user_ns, and "> 32" in create_user_ns() can limit 32 non-root 
namespaces. And that depends on your design. :)



Thanks.


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