Linux Internals Training

• Compile and build Kernel from source
• Simple examples on LKM(Loadable Kernel Modules)
• Simiple example to read process information

Compiling and installing Kernel

Prerequisite: gcc & libncurses5 on Ubuntu 14.10

1. Get the latest Linux Kernel code here
2. Extract the source file using
   tar pxvf source.tar.xz or tar jxvf source.tar.bz3
3. Configure kernel using
   make [x|g|menu]config or make [x|g|menu]config ARCH=x86_64
   Note: Architecture specific libraries are must
4. Compile the kernel using make
5. Compile modules make modules and install them make modules_install
6. Install the newly compiled kernel using make install
7. Create initrd image cd /boot and mkinitramfs -o initfd.img-ver ver
8. Update grub using update-grub

Reference

Compiling and installing Kernel Module

Prerequisite: gcc & linux-headers on Ubuntu 14.10

1. Build ko(kernel object) file by running make
2. Load ko file by running sudo insmod hello.ko
3. Validate if ko was succesfully loaded by * Checking dmesg output for 'printk' statements * Run sudo lsmod and find your module listed
4. Unload a module by running sudo rmmod hello