> Does sel4 have a style checker and/or proof checker that you can run on your c code?
The specification and proofs are open-source [0], but I suspect that they are tailored for seL4-related uses and probably aren't well-suited for "general-purpose" C code. I think using their proofs would also necessitate writing a specification for your own code which is probably going to be an ordeal in and of itself.
They do have a style guide [1] as well, but that's just a small part of the full verification process (described in [2]).