[Devel] Re: [RFC][PATCH 0/2] user namespace [try #2]

[Eric W. Biederman]

Herbert Poetzl <herbert at 13thfloor.at> writes:

> On Thu, Sep 07, 2006 at 12:18:14PM -0600, Eric W. Biederman wrote:
>> Kirill Korotaev <dev at sw.ru> writes:
>> 
>> > yes, these patches are usable for OpenVZ AS IS, so I'm not sure
>> > why we can't do step by step and commit. However I posted some comments on
>> > patches...
>> >
>> > Eric do you have some STRONG objections (maybe I just missed it somewhere)?
>> 
>> - We do not handle interactions between processes in different uid
>>   namespaces and still have the normal uid equality checks.
>> - I am willing to be convinced that this is a nuclear missile the user
>>   is allowed to shoot themselves in the foot with if someone can show me
>>   how to use the current version safely.
>> 
>> A lot of this scares me silly as when ever you touch the primary
>> identifier in the security checks you must be very very very careful.
>> My gut feeling is that I'm nowhere near paranoid enough and the rest
>> of you aren't even paranoid.
>> 
>> What I want to see is that every uid identity check becomes either
>> a struct user comparison or a uid, uid_ns tuple comparison.
>
> second that!

In addition I don't have problems with incremental progress
if we implement in such a way that we don't enable the ability
to create a new uid namespace to user space before we are certain
it is safe.

All of the code could be present and we just have a one line check
that denied requests to create a new namespace.

Eric
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