sukadev@us.ibm.com writes:

> From: Sukadev Bhattiprolu <sukadev@us.ibm.com>
> Subject: [PATCH] Masquerade sender information
>
> With multiple pid namespaces, sender of a signal could be in an ancestor
> namespace of the receiver and so the sender will not have a valid 'pid_t'
> in the receiver's namespace.
>
> In this case, masquerade the 'siginfo' for the signal to pretend that the
> signal originated from the kernel.

At first glance this looks ok.  I think the only case where we can
be sending a signal from inside a pid namespace to something not
in a child pid namespace is if we are the kernel.  In which case
we also want si_pid = 0.

If that holds this problem is easier then I was thinking it would
be.

Eric


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