sys_tz is not namespaced.

[Rob Landley]

Re commit d95debbdc528 fixing CLONE_NEWTIME to work in clone()...

I note that sys_tz in kernel/time/time.c does not appear to be namespaced?

You might want to at least fail trying to set it outside of the root time
namespace. (Line 186, unless security_settime64() is already doing that?)

Rob