From mboxrd@z Thu Jan  1 00:00:00 1970
From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman)
Subject: Re: [PATCH 2/4] clone.2: Describe the user namespace
Date: Tue, 01 Jan 2013 01:39:43 -0800
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	(Michael Kerrisk's message of "Tue, 1 Jan 2013 10:29:51 +0100")
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"Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> Hi Eric,
>
> On Thu, Dec 27, 2012 at 6:47 PM, Eric W. Biederman
> <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org> wrote:
>>
>> There is one other bit that needs to be documented in clone, although
>> I am not certain where/how.
>>
>> The sequences:
>>
>> unshare(CLONE_NEWPID).
>> clone(CLONE_VM)
>>
>> setns(fd, CLONE_NEWPID).
>> clone(CLONE_VM).
>>
>> Now fail.
>
> Can you define "now" please. Which kernel version?

3.8

The sequence was impossible in 3.7.

I think that change that made that impossible happened in the 3.8-rc1 to
3.8-rc2 window.

Eric