1. install ubuntu 22.04 5.15.0-25

2. apt-get install build-essential flex libncurses-dev linux-headers-generic linux-source libssl-dev bison yacc vim libelf-dev ...... and so on

3. cp /lib/modules/5.15.0-25-generic/build/Module.symvers ./

4. /boot/config-5.15.0-25-generic as .config make oldconfig

5. make menuconfig

1. close CONFIG_STACKPROTECTOR

2. close CONFIG_RETPOLINE

3. close CONFIG_UBSAN_BOUNDS

4. close CONFIG_UBSAN_ENUM

6. modify ./scripts/mod/modpost.c

1. skip add_srcversion (just return)

2. force add_retpoline (#ifdef --> #ifndef)

3. force add_intree_flag

7. make modules_prepare LOCALVERSION=-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

8. Append padding at the end of struct module <include/linux/module.h>

struct module {

enum module_state state;

/* Member of list of modules */

struct list_head list;

/* Unique handle for this module */

char name[MODULE_NAME_LEN];

....

char padding[1024];

};

This is because struct module size is different in different kernel versions or with different CONFIG item.

9. make modules M=/home/dmpatch

10. strip --strip-debug /home/dmpatch/dm_patch.ko