ejaaskel - Embedded Software Handyman

Adding Key-Based SSH Authentication to Yocto

This text is supposed to be a quick crash course on the different keys used in SSH servers, and how to generate and use them in Yocto.

November 6, 2024 by ejaaskel Yocto

Fuzzing Yocto Kernel Modules with Syzkaller

As a follow-up to my black-box fuzzing text, I will present a more accurate approach to fuzzing using Syzkaller and grey-box fuzzing.

October 27, 2024 by ejaaskel Fuzzing

Raspberry Pi 4, LetsTrust TPM and Yocto

Getting LetsTrust TPM module working with Yocto was fairly simple but there were a few things I learned along the way that may be worth sharing.

September 20, 2024 by ejaaskel Embedded

Yocto Hardening: Measured Boot

So far we have mostly been focusing on hardening the kernel and userspace, but this time we will zoom out a bit and take a look at securing the entire system.

August 27, 2024 by ejaaskel Yocto

Making USB Device With STM32 + TinyUSB

Have you ever wondered how USB devices are made? I sure have. Follow this tutorial to see how to create a simple USB device.

August 3, 2024 by ejaaskel Embedded

Black-Box Fuzzing Kernel Modules in Yocto

It’s been almost ten years since I wrote my thesis. It was about guided fuzz testing, and as usual, I have done no actual work related to the topic.

June 19, 2024 by ejaaskel Fuzzing

Yocto Emulation: Setting Up QEMU with TPM

Last time we got QEMU to launch u-boot, started kernel, and mounted a virtual drive. This time we are “just” going to add a TPM device to the virtual machine.

April 20, 2024 by ejaaskel Yocto

Yocto Emulation: Setting Up QEMU with U-Boot

Yocto provides a script for using QEMU in the form of runqemu. However, that script just boots up the kernel using whatever method QEMU considers the best.

April 1, 2024 by ejaaskel Yocto