linux-kernel - Re: Issue with clone() and CLONE

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Message-Id: <A54DB26A-07AF-4DA8-899F-1DCE527C2389@holtmann.org>
Date:	Thu, 21 Aug 2014 17:26:51 -0500
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: Issue with clone() and CLONE_NEWUSER as unprivileged user

Hi Andy,

>> I am trying to use clone() and CLONE_NEWUSER for creating a new user namespace as an unprivileged user. I always get an operation not permitted error. However when I used fork() + unshare() as unprivileged user, I can create the new user namespace just fine.
>> 
>> Is there something obvious that I am missing? My understand is that CLONE_NEWUSER should not require any special capabilities. I tried the sample code from the manpage and also from LWN.net, but both give me the same error.
> 
> It works for me on 3.16 and 3.15 but not on 3.15.8-200.fc20.x86_64.  I'm
> a bit confused.  What kernel are you using?

I am running 3.15.6-200.fc20.x86_64 actually. What confused me is that fork() + unshare() works fine, but clone() doesn't.

Regards

Marcel

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