DMPATCH/readme.txt

   1 1. install ubuntu 22.04  5.15.0-25
   2 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 3. cp /lib/modules/5.15.0-25-generic/build/Module.symvers ./
   4 4. /boot/config-5.15.0-25-generic as .config   make oldconfig
   5 5. make menuconfig
   6     1. close CONFIG_STACKPROTECTOR
   7     2. close CONFIG_RETPOLINE
   8     3. close CONFIG_UBSAN_BOUNDS
   9     4. close CONFIG_UBSAN_ENUM
  10
  11 6. modify ./scripts/mod/modpost.c
  12     1. skip add_srcversion (just return)
  13     2. force add_retpoline (#ifdef --> #ifndef)
  14     3. force add_intree_flag
  15
  16 7. make modules_prepare LOCALVERSION=-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  17
  18 8. Append padding at the end of struct module <include/linux/module.h>
  19 struct module {
  20     enum module_state state;
  21
  22         /* Member of list of modules */
  23         struct list_head list;
  24
  25         /* Unique handle for this module */
  26         char name[MODULE_NAME_LEN];
  27
  28     ....
  29
  30     char padding[1024];
  31 };
  32
  33 This is because struct module size is different in different kernel versions or with different CONFIG item.
  34
  35
  36 9. make modules M=/home/dmpatch
  37 10. strip --strip-debug /home/dmpatch/dm_patch.ko
  38