Embedded Systems Weekly #135
Tags: embeddedsystems, embedded
Published: 2023-01-13 15:48:10

This week Siemens revealed a new vulnerability in its S7-1500 CPU product family: [Missing Immutable Root of Trust](https://sie.ag/3vXkH5c). What does it mean in simple words? The device can't ensure the integrity of the code executed. One would say, let's patch the vulnerability. Herein lies the big problem with this vulnerability. The origin is burned on a chip. Conclusion: No fix planned. And one advice: be careful with whom can access the product. Really?!

**Happy reading!**

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## Articles
[A Comparison of SPARK with MISRA C and Frama-C](https://bit.ly/3W9YHPh)
There is for sure a bias in this paper hosted on the Adacore website. Nevertheless, I find the comparison fair. With the recent changes in the way Adacore licenses its libraries, and improvements in dependency management, I feel that Ada can get its chance in the popularity charts.

[Taking over a Dead IoT Company](https://bit.ly/3ZznkaJ)
It's a fun reading, and there is more to it than the title share. The author analyzes why the defunct [NYC Train Sign](https://bit.ly/3GEJi3z) failed. From his point of view, mainly because the BOM (Bill Of Materials) was too high and the retail price too low. He shares: "One trick I use is that multiplying the BOM cost by 4 will often get you the retail price." Do you agree with his approach as a back of the enveloppe estimation?

[What're you telling me, Ghidra?](https://bit.ly/3Wh7LC0)
Many articles on reverse engineering something are using Ghidra. It could be intimidating to start right away in an advanced subject. With this article, you can get yourselves familiar with the tool.

[Welcome to Comprehensive Rust 🦀](https://bit.ly/3XaKJh9)
Rust usage is spreading everywhere: In the Linux kernel, recently in the [Chrome web browser](https://bit.ly/3vYsGPm), and notably in Android. As a bonus, The team behind the course is maintaining [discussions on Github](https://bit.ly/3IQsZ6F) where you can ask questions.

[Whoops: Linux's strcmp() For The m68k Has Always Been Broken](https://bit.ly/3kfSsMr)
That's a  story that makes obvious how benefic the recent changes toward safety are. This subtle bug has been found because the flag  "-funsigned-char" is now enabled by default. Way to go Linux kernel team!

[If you use a custom linker script, _start is not (necessarily) the entry point](https://bit.ly/3Zw12GV)
Great article to complement your knowledge if you are starting your journey into custom linker scripts.

## Tools / Libraries
[WLED Project](https://bit.ly/3CLcmFj)
A fast and feature-rich implementation of an ESP8266/ESP32 webserver to control many kinds of LEDs

## Jobs
[Blue Origin, Avionics Software Senior Manager – Advanced Development Programs, Seattle, WA $177k-$259k / year](https://jobs.embedsysweekly.com/job/Kz6rZvjK/avionics-software-senior-manager-advanced-development-programs)
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## Misc
[Nixie Tube Audio Meter](https://bit.ly/3kfHNBc)
It is such a beautiful project. I could not add it to the newsletter. As a bonus, the author shares his workflow to generate animated 3D previews of the case with the PCB in.

[Apollo Guidance Computer Restoration](https://bit.ly/3CMIF6R)
The whole Youtube playlist is magnificent. If you love electronics, be careful. If you launch one of these videos, you're going to lose hours of your day.