On Wed, Apr 20, 2022 at 7:47 PM Kees Cook <keescook@xxxxxxxxxxxx> wrote:
Yeah, I was trying to understand why systems were using binfmt_flat and
not binfmt_elf, given the mention of elf2flat -- is there really such a
large kernel memory footprint savings to be had from removing
binfmt_elf?
I think the main reason for using flat binaries is nommu support on
m68k, xtensa and risc-v. The regular binfmt_elf support requires
an MMU, and the elf-fdpic variant is only available for arm and sh
at this point (the other nommu architectures got removed over time).
Arnd
