>>>> 3. Suka assumes that pid namespace can live without proc mount
>>>>    and tries to make the code work with pid_ns->proc_mnt change
>>>>    from NULL to not-NULL from times to times.
>>>>    My code calls the kern_mount() at the namespace creation and
>>>>    thus the pid_namespace always works with proc.
>>> shouldn't that be done by userspace instead?
>> It can be. But when the namespace is being created there's no
>> any userspace in it yet.
> 
> I'm not talking about the 'userspace inside the space'
> I'm talking about the userspace creating the space
> (what if I do not want to have any proc mount?)

yes, can't we let the user doing the unshare or clone decide whether
it needs to mount /proc or not in the new pid namespace ?

that's already optional on the host. 

C.
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