DMPATCH/readme.txt

   1 1. install ubuntu 21.10
   2 2. apt-get install build-essential flex ncurse linux-headers-generic linux-source ...... and so on
   3 3. cp /lib/modules/5.13.0-23-generic/build/Module.symvers ./
   4 4. /boot/config-5.13.0-23-generic as .config   make oldconfig
   5 5. make menuconfig
   6     1. close CONFIG_STACKPROTECTOR
   7     2. close CONFIG_RETPOLINE
   8
   9 6. modify ./scripts/mod/modpost.c
  10     1. skip add_srcversion (just return)
  11     2. force add_retpoline (#ifdef --> #ifndef)
  12
  13 7. make modules_prepare LOCALVERSION=-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  14
  15 8. Append padding at the end of struct module <include/linux/module.h>
  16 struct module {
  17     enum module_state state;
  18
  19         /* Member of list of modules */
  20         struct list_head list;
  21
  22         /* Unique handle for this module */
  23         char name[MODULE_NAME_LEN];
  24
  25     ....
  26
  27     char padding[1024];
  28 };
  29
  30 This is because struct module size is different in different kernel versions or with different CONFIG item.
  31
  32
  33 9. make modules M=/home/dmpatch
  34 10. strip --strip-debug /home/dmpatch/dm_patch.ko
  35