> obvious change after previous, attached is a diff to replace securelevel
> references in various device drivers with kauth calls.
> 
> I think they're correct, but please review at least the tc/stic.c one.

seems sane to me.  but i don't claim i understand these drivers.

a minor nit:
i think it's better to do

	error = kauth_foo();
	if (error)
		return error;

rather than

	error = kauth_foo();
	if (error)
		return EPERM;

YAMAMOTO Takashi