README.md

Yet Another BootLoader, OS Kernel and Other stuff

Forked from

• https://github.com/hse-cs-ami/yabloko-public

Updates

• Add functions to read files from encrypted disk to RAM 'on-the-fly'

How does it work?

• I use CBC mode and XOR cipher to encrypt the drive
• You can find the IV and ENC_KEY constants on the beggining of the Makefile
• When user boot OS, he enters the key which is stored in cr3 register
• When user wants to run a program, the code of program decrypts using the key entered by the user. If the key right, the program runs, otherwise it's not.
• NOTE: Only ELF files are encripted - the directory structure and kernel code aren't ecnrypted

Quickstart:

$ ./setup.sh
$ make

How to run using llvm

You can use this way even if you have windows. You need to install llvm and qemu. Check that executables clang, ld.lld, qemu-system-i386 available from your terminal/console.

make LLVM=on

How to debug in my favorite IDE

Start debug server using command make debug-server or make debug-server-nox if you don't want to see gui, and then connect using remote gdb option to localhost:1234 (symbols file is kernel.bin)

Includes code from:

• https://github.com/mit-pdos/xv6-public
• https://github.com/FRosner/FrOS
• https://github.com/dhavalhirdhav/LearnOS
• https://wiki.osdev.org