That would be a violation of the copyright law or the GPL licence - you aren't permitted to take GPL code and redistribute it with some extra restrictions added on to it.
If it's not (fully) your code, you aren't free to set the licence conditions; Linus can't do that without getting approval from 100% (not 99% or so) of authors who contributed code.
What one can do is add an informative disclaimer saying "To the best of our knowledge, installing or running this thing in California is prohibited - we permit to do whatever you want with it, but how you'll comply with that law is your business".
You can if you own the copyright to the content. I don't know the state of Linux, but this is a reason the FSF (and many other projects) requires people assign their copyright to them when they submit code.
It also helps when you take an offender to court. If I contribute to a project but don't assign copyright, then they cannot take offenders to court if my code was copied illegally. The burden is on me to do so.
Of course, all code released prior to the change still remains on the original license.
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