How to compile a Linux kernel module for Android Emulator(LDPLAYER/NOX)

HowToCompileAndroidEumlatorLKM.txt

- LDPlayer ver 9.0.45(9)
Android version 9
Kernel 4.4.146 #1 Thu Apr27 10:42:33 (ST 2023)
Build Number PQ3A 190705.003 release keys

$modinfo vboxsf.ko
vermagic:       4.4.146 SMP preempt mod_unload modversions

- To compile a linux kernel module:
git clone https://android.googlesource.com/kernel/goldfish/ -b android-goldfish-4.4-dev
git clone https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9
cd x86_64-linux-android-4.9
git checkout pie-b4s4-release
cd goldfish
export CROSS_COMPILE=x86_64-linux-android-
export ARCH=x86_64
export PATH=$PATH:/path/to/x86_64-linux-android-4.9/bin
make x86_64_ranchu_defconfig
make menuconfig  # enable overlayfs and namespaces support here
make -j8

- hello.c
#include <linux/module.h>  /* Needed by all modules */
#include <linux/kernel.h>  /* Needed for KERN_ALERT */
#include<linux/init.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("dambo, 2023");
MODULE_DESCRIPTION("Demo module");

static int __init hello_start(void)
{
  printk("hello to the world from module");
  return 0;
}

static void __exit hello_end(void)
{
  printk("hello exit");
}

module_init(hello_start);
module_exit(hello_end);

-Makefile

KDIR=~/Workspace/android-sdks/goldfish-4.4-dev/
PWD := $(shell pwd)

obj-m += hello.o

CCPATH := ~/Workspace/android-sdks/x86_64-linux-android-4.9/bin/
CCPATH_EXT := $(CCPATH)x86_64-linux-android-
ARCH=x86_64

default:
	make -C $(KDIR) CFLAGS_MODULE=-fno-pic ARCH=$(ARCH) CROSS_COMPILE=$(CCPATH_EXT) $(KERNEL_DIR) M=$(PWD) modules

clean:
	make -C $(KERNEL_DIR) M=$(PWD) clean

- compile
$ make
- outputs
make -C ~/Workspace/android-sdks/goldfish-4.4-dev/ CFLAGS_MODULE=-fno-pic ARCH=x86_64 CROSS_COMPILE=~/Workspace/android-sdks/x86_64-linux-android-4.9/bin/x86_64-linux-android-  M=/home/ubuntu/Workspace/android-sdks/custom_modules/hello modules
make[1]: Entering directory '/home/ubuntu/Workspace/android-sdks/goldfish-4.4-dev'
  Building modules, stage 2.
  MODPOST 1 modules
  LD [M]  /home/ubuntu/Workspace/android-sdks/custom_modules/hello/hello.ko
- adb shell
/data/local/tmp # modinfo hello.ko
modinfo hello.ko
filename:       hello.ko
author:         dambo, 2023
license:        GPL
depends:
vermagic:       4.4.302+ SMP preempt mod_unload modversions

- goldfish/Makefile
VERSION = 4
PATCHLEVEL = 4
SUBLEVEL = 146
EXTRAVERSION =
make -j8 LOCALVERSION=""

hi my friend :) i can't run hello on ld 9.0.45(9)

got this: logcat
insmod: failed to load hello.ko: Exec format error
and this dmesg 
[  123.349346] hello: disagrees about version of symbol module_layout

1|:/data/local/tmp # modinfo hello.ko
filename:       hello.ko
author:         dambo, 2023
license:        GPL
depends:
vermagic:       4.4.146 SMP preempt mod_unload modversions

can u help me? and i can't undestand that u use git checkout pie-b4s4-release branch :)

Hello everyone
i have same issue and getting same error

disagrees about version of symbol module_layout

KSNS8I4:~/ldplayer_module$ modinfo hello.ko
filename:       /home/i/ldplayer_module/hello.ko
description:    LDPlayer9 Demo Module
author:         dambo, 2023
license:        GPL
depends:
retpoline:      Y
vermagic:       4.4.146 SMP preempt mod_unload modversions

KSNS8I4:~/ldplayer_module$ modinfo vboxsf.ko
filename:       /home/i/ldplayer_module/vboxsf.ko
version:        6.1.36 r152435
alias:          fs-vboxsf
license:        GPL and additional rights
author:         Oracle Corporation
description:    Oracle VM VirtualBox VFS Module for Host File System Access
srcversion:     2E5DC49B1A7F01FC78BAC88
depends:        vboxguest
vermagic:       4.4.146 SMP preempt mod_unload modversions
parm:           follow_symlinks:Let host resolve symlinks rather than showing them (int)

LOGS:

[  108.229351] hello: disagrees about version of symbol module_layout
[  108.239316] type=1400 audit(1753502806.994:473): avc: denied { module_load } for pid=4104 comm="insmod" path="/data/local/tmp/hello.ko" dev="sdb2" ino=131304 scontext=u:r:su:s0 tcontext=u:object_r:shell_data_file:s0 tclass=system permissive=1
[  108.248559] type=1400 audit(1753502806.994:473): avc: denied { module_load } for pid=4104 comm="insmod" path="/data/local/tmp/hello.ko" dev="sdb2" ino=131304 scontext=u:r:su:s0 tcontext=u:object_r:shell_data_file:s0 tclass=system permissive=1