Anyone just a quick question i could create LKM modules in C but i just wanted to know if anyone knows anything about the compilation process, I have followed 2 guides, i create a REL format ELF64 format and produces an .o file. Just confused do i also have to make this like in C. Anyway i just get:

insmod: ERROR: could not insert module lkm.o: Invalid module format

This just brings me to think i also have to make this like build in C makefile. So if anyone knows if i also have to build this into a .ko or something ??

Perhaps you are confusing .o with .ko?

Im just trying a few things i see the other FASM guides, just in this example its talking about a FASM patch (https://board.flatassembler.net/topic.php?t=7519). Does anyone know if this patch has been fixed, I am just trying loads of differant options. I will probs get this working maybe iuts because im using the newest kernal version.

The current version of fasm puts zeros in the relocated fields.

Yeah that version i think ive figured out, just this version i get compile error maybe u know why: ?

=========================================================================================================================
format ELF64
extrn printk
section '.init.text' executable

module_init:
push rdi

mov rdi, str1
xor eax, eax
call printk

xor eax, eax
pop rdi
ret


section '.exit.text' executable
module_cleanup:
xor eax, eax
ret

section '.rodata.str1.1'
str1 db '<0> Here I am, gentlemen!', 0x0a, 0

section '.modinfo' align 10h
db 'license=GPL', 0
db 'depends=', 0
db 'vermagic=6.12.10-arch1-1 SMP preempt mod_unload ', 0

section '.gnu.linkonce.this_module' writable
this_module:
rb 18h
db 'simple_module', 0
rb 148h - ($ - this_module)
rb 150h - ($ - this_module) dq module_init
rb 238h - ($ - this_module)
rb 248h - ($ - this_module) dq module_cleanup
dq 0

section '__versions'
dq 0x568fba06
dq 0x2ab9dba5 @@:
db 'module_layout', 0
rb 56 - ($ - @b)

dq 0x27e1a049
@@:
db 'printk', 0
rb 56 - ($ - @b)
=========================================================================================================================

# I get this error

============================================================================================================
flat assembler version 1.73.32 (16384 kilobytes memory, x64)
shelllsm40.asm [36]:
rb 150h - ($ - this_module) dq module_init
processed: rb 150h-($-this_module)dq module_init
error: extra characters on line.
============================================================================================================

# Do you know how i can format this so it works...
#
# rb 150h - ($ - this_module) dq module_init <<-- (extra characters on line)
#
# Do u know how i could fix this as i can get this version to load ok
#
# Just any thoughts ?? cheers

rb and dq are separate things.

ohh , because ive never done kernal modules i thought the format had to be like that, cheers mate thats fixed it, theres just loads of differant ways to structure FASM thats why i love it soo much, cheers mate.