DMPATCH/readme.txt

   1 1. install ubuntu 21.10
   2 2. apt-get install build-essential flex libncurses-dev linux-headers-generic linux-source libssl-dev ...... 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     3. force add_intree_flag
  13
  14 7. make modules_prepare LOCALVERSION=-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  15
  16 8. Append padding at the end of struct module <include/linux/module.h>
  17 struct module {
  18     enum module_state state;
  19
  20         /* Member of list of modules */
  21         struct list_head list;
  22
  23         /* Unique handle for this module */
  24         char name[MODULE_NAME_LEN];
  25
  26     ....
  27
  28     char padding[1024];
  29 };
  30
  31 This is because struct module size is different in different kernel versions or with different CONFIG item.
  32
  33
  34 9. make modules M=/home/dmpatch
  35 10. strip --strip-debug /home/dmpatch/dm_patch.ko
  36