binfmt_misc: split out entry_open_interpreter() and build_interp_argv()

Opening the interpreter is a property of the matched entry: an 'F' entry
hands out a clone of the file it pre-opened at registration time, any
other entry opens the selected path. Give that its own helper instead of
an if/else in the middle of load_misc_binary(), and let it fail early
rather than carrying an ERR_PTR through the successful branch.

Building the interpreter's argument vector is the bulk of what remains
and the one part of load_misc_binary() that is specific to the classic
dispatch. Move it into its own helper too, so the dispatch reads as what
it is: pick a handler, pick an interpreter, build the invocation, open
it.

No functional change.

Link: https://patch.msgid.link/20260721-work-bpf-binfmt_misc-ptinterp-v2-5-e57866e4ae0f@kernel.org
Reviewed-by: Farid Zakaria <farid.m.zakaria@gmail.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions