linux-kernel - Issue with clone() and CLONE_NEWUSER as unprivileged user

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Message-Id: <606D4327-C729-49F7-9CFD-3D25D0A62A13@holtmann.org>
Date:	Mon, 18 Aug 2014 00:35:31 -0500
From:	Marcel Holtmann <marcel@...tmann.org>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Issue with clone() and CLONE_NEWUSER as unprivileged user

Hi,

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.

Regards

Marcel

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