Day 5 - Kernel Module Basics

What I learned

• Linux kernel supports loadable modules
• Kernel space vs user space difference
• How to write a simple kernel module

Commands

make
sudo insmod hello.ko
dmesg | tail
sudo rmmod hello

Observations

• printk output appears in dmesg
• Kernel module runs with high privilege

Questions

• How to access hardware from module?
• How does driver register device?