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References: <20101217152246.GA8221@mail.hallyn.com>
	<20101217152458.GA11162@mail.hallyn.com>
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Date: Fri, 17 Dec 2010 18:00:17 +0200
Message-ID: <AANLkTik2ry7zbRMgiwhrXMYfQ4tr07BW0ODCNbKBMWmc@mail.gmail.com>
Subject: Re: [RFC 1/5] user namespaces: Add a user_namespace as creator/owner
 of uts_namespace
From: Alexey Dobriyan <adobriyan@gmail.com>
To: "Serge E. Hallyn" <serge@hallyn.com>
Cc: LSM <linux-security-module@vger.kernel.org>,
        James Morris <jmorris@namei.org>, Kees Cook <kees.cook@canonical.com>,
        containers@lists.linux-foundation.org,
        kernel list <linux-kernel@vger.kernel.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Michael Kerrisk <michael.kerrisk@gmail.com>
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On Fri, Dec 17, 2010 at 5:56 PM, Alexey Dobriyan <adobriyan@gmail.com> wrote:
> On Fri, Dec 17, 2010 at 5:24 PM, Serge E. Hallyn <serge@hallyn.com> wrote:
>> +/*
>> + * userns count is 1 for root user, 1 for init_uts_ns,
>> + * and 1 for... ?
>> + */
>> ?struct user_namespace init_user_ns = {
>> ? ? ? ?.kref = {
>> - ? ? ? ? ? ? ? .refcount ? ? ? = ATOMIC_INIT(2),
>> + ? ? ? ? ? ? ? .refcount ? ? ? = ATOMIC_INIT(3),
>
> +1 is for init_nsproxy ;-)

Err, no.

+1 is to ensure it's never freed, but since allocator will BUG_ON (?) if fed
with static object, maybe it's completely bogus.
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