I assume that most or all of the common CPUs you can buy today include backdoors inserted at the request of one intelligence agency or another.
Seems like two things are in direct conflict: On one hand, a company needs to protect it's IP and prevent China from outright copying it's designs and selling without the R&D cost attached. On the other hand, but publishing it's designs, it can be verified as safe by anyone.
Researchers develop techniques to spot hardware trojans.