[PATCH] userns,pidns: Verify the userns for new pid namespaces

Eric W. Biederman ebiederm at xmission.com
Sun Apr 30 04:33:24 UTC 2017


"Serge E. Hallyn" <serge at hallyn.com> writes:

> Quoting Eric W. Biederman (ebiederm at xmission.com):
>> 
>> It is pointless and confusing to allow a pid namespace hierarchy and
>> the user namespace hierarchy to get out of sync.  The owner of a child
>> pid namespace should be the owner of the parent pid namespace or
>> a descendant of the owner of the parent pid namespace.
>> 
>> Otherwise it is possible to construct scenarios where it is legal to
>> do something in a parent pid namespace but in a child pid namespace.
>
> Hi,
>
> did you mean 'but not in a child...' above?

Actually I believe I meant:

>> Otherwise it is possible to construct scenarios where it is not legal
>> to do something in a parent pid namespace but it is legal a child pid
>> namespace.

I definitely need to fix that wording thank you.

Eric


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