On 2026-01-31 16:44:40+0900, Daniel Palmer wrote:
> Since commit 1bde925d2354 ("fs/binfmt_elf_fdpic.c: provide NOMMU loader for regular ELF binaries")
> it has been possible to load some normal ELF binaries on nommu but it
> wasn't documented in the help.
>
> Since nolibc can generate static-pie binaries that work with this loader
> document that normal ELFs can work as long as they are PIE and you have
> a linker and that nolibc can also generate static-PIE binaries that
> can load without any assitance.
>
> Signed-off-by: Daniel Palmer <daniel@thingy.jp>
> ---
> fs/Kconfig.binfmt | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
> index 1949e25c7741..71573bfd32ac 100644
> --- a/fs/Kconfig.binfmt
> +++ b/fs/Kconfig.binfmt
> @@ -69,6 +69,16 @@ config BINFMT_ELF_FDPIC
>
> It is also possible to run FDPIC ELF binaries on MMU linux also.
>
> + On nommu systems this can also load normal ELF binaries as long as
> + the binary is linked as PIE. If the binary is not static PIE, does not
> + include it's own relocation code, this requires a linker like uldso to
> + be present and set as the interpreter.
Something like this can be split out of this series and submitted standalone.
> +
> + nolibc included in the kernel source can create static-PIE binaries
> + by including relocation code and the resulting binaries run on MMU
> + systems with the normal ELF loader and on nommu systems with this
> + loader.
I don't think this paragraph should be here.
Maybe we can add the information to the nolibc documentation instead.
> +
> config ELFCORE
> bool
> help
> --
> 2.51.0
>