1. A system for securing access to system calls, comprising: a memory; a first operating system configured to execute on an electronic device, the first operating system included in one or more operating systems on the electronic device; a below-operating-system security agent configured to: identify one or more resources associated with a system call for which attempted accesses will be trapped; trap, at a level below all operating systems of the electronic device, an attempted access of the one or more resources that originates from an operational level of the first operating system; access one or more security rules to determine, at a level below all operating systems of the electronic device, whether the attempted access is authorized; and operate at a level below all operating systems of the electronic device; wherein: the trapped attempt is an attempted execution of a system call function of the first operating system, the system call function indexed by a system call table; the below-operating system security agent is further configured to: determine that the attempted execution of the system call function was made without accessing the indexing of the system call table; and based upon a determination that the attempted execution of the system call function was made without accessing the indexing of the system call table, deny the attempted execution.