[Devel] Re: [patch -mm 08/17] nsproxy: add hashtable

[Cedric Le Goater]

Serge E. Hallyn wrote:
> Quoting Serge E. Hallyn (serue at us.ibm.com):
>> Quoting Eric W. Biederman (ebiederm at xmission.com):
>>> Herbert Poetzl <herbert at 13thfloor.at> writes:
>>>>> Beyond that yes it seems to make sense to let user space
>>>>> maintain any mapping of containers to ids.
>>>> I agree with that, but we need something to move
>>>> around between the various spaces ...
>>> If you have CAP_SYS_PTRACE or you have a child process
>>> in a container you can create another with ptrace.
>>>
>>> Now I don't mind optimizing that case, with something like
>>> the proposed bind_ns syscall.  But we need to be darn certain
>>> why it is safe, and does not change the security model that
>>> we currently have.
>> Sigh, and that's going to have to be a discussion per namespace.
> 
> Well, assuming that we're using pids as identifiers, that means

we can't because a process could die while the namespace is still
referenced by an other subsystem. We need some kind of id.

> we can only enter decendent namespaces, which means 'we' must
> have created them.  So anything we could do by entering the ns,
> we could have done by creating it as well, right?

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