[$] Bringing BPF to binfmt_misc

The kernel is able to run a few types of executable files, including nativebinaries in the ELF format and interpreted programs that begin with the#! marker. It also, however, has a mechanism, called binfmt_misc,that can be configured from user space to enable the transparent executionof programs in just about any format. This feature has been relativelystatic for years, but it seems likely to receive some significant updatesin the near future, including the ability to load BPF programs that candecide how to run a given program.