Bonum Certa Men Certa

How To Deal With Your Raspberry Spy -- Part V: All The Rest

By Gavin L. Rebeiro

Contents



Cover

Copyright

1 Acknowledgements

2 Introduction

2.1 Prerequisite Knowledge 2.2 Apparatus

3 Fundamentals

3.1 Communication 3.2 Kernel Ring Buffer 3.3 Drivers 3.4 Operating Systems 3.5 Special Files

4 Doing The Task

4.1 Preparing The Boot Media 4.2 Connecting Physical Components 4.3 Using Picocom 4.4 OS Installation

5 YOU ARE HERE ☞ Thanks

6 OpenPGP Key

A Malicious Hardware

B Linux Kernel Source Tree Analysis

C Digital Multimeter Tests

Summary: The final part of a series on liberating the Raspberry Spy from an untrustworthy OS that secretly adds Microsoft keys and proprietary software repositories of Microsoft (see Part I, Part II, Part III, and Part IV)

THIS part is mostly addenda.

Chapter 5: Thanks



We’d like to take the opportunity to thank you, the reader. We believe everyone deserves a computing education; however, the topics of computing freedom and how computing affects our basic human rights are neglected in computing education today; at E2EOPS PRESS we strive to change this. Our goal is to inform, educate, and inspire. Computing is also a lot of fun! We want everyone to experience the joys of computing. We hope you enjoyed this issue of our periodical as much as we enjoyed bringing it to you!

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And, as always, happy hacking!

Chapter 6: OpenPGP Key



At E2EOPS PRESS, we take your privacy seriously. If you want to send us an encrypted message, you can do so with the following OpenPGP key:

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Appendix A: Malicious Hardware



While doing research for this issue, I often ran into USB-to-UART bridges of the “FTDI” variety. Upon further digging, an ugly bit of history surfaced. The FTDI modules have a reputation for sabotaging people’s hardware.

Sadly, we live in a world where this sort of thing is the norm. Pay close attention to the products you buy. You need to practice vigilance in order to defend your computing freedom. Remember, you have control over your wallet. Don’t support malicious actors, if you have the choice (in this case you almost certainly do).

Appendix B: Linux Kernel Source Tree Analysis



The directory trees rooted at /sys and /proc are mapping of Linux kernel data structures and interfaces; you can read up on these in the Linux kernel source tree from:

● linux/Documentation/filesystems/sysfs.rst ● linux/Documentation/filesystems/proc.rst

You don’t have a local, up-to-date, copy of the Linux kernel source tree? You really should. Note that some of this documentation is hilariously out-of-date; use the git log on a file to see the last time parts of a file was given an up-date:

 $ git log -p filename


This should give you what you need. Since the Linux kernel is developed with Git, it pays dividends to learn at least the fundamentals of Git.

It’s a frequent occurence that people ask me how to make sense of the Linux kernel. You need the following prerequisites:

● A familiarity with the C programming language. The syntax is easy to pick up for most people because a lot of the popular programming languages in use today are based on C. Most operating systems today are written in C; the same goes for embedded systems. If you don’t have a good grasp of C, you can kiss any hopes on working on this stuff goodbye. C is not as hard as people make it out to be; just look at real code and don’t waste your time on pointless exercises. Start with the smallest real-world programs you can find - like echo(1); once you get the simple stuff, get more ambitious and look at more complicated things. The following resource is also invaluable to the novice C programmer: C reference.

● To make sense of other people’s C code (particularly spaghetti), you need a good source code tagging system. I recommend GNU Global because it works well on most Bourne Shells. Using GNU Global will enable you to look up definitions for things like functions and structs in C code easily.

● You need to learn GNU Autotools to automate the workflow of building makefiles and such. The old “./configure && make && make install” ritual stems from GNU Autotools. Learn it and embrace it. You can build truly portable software once you learn the fundamentals of GNU Autotools. You won’t understand head nor tail of embedded programming with the Linux kernel (and several other things) unless you have a grasp on the rudiments of GNU Autotools.

● Whether you like it or not, Git is an essential part of Linux kernel development. Without a firm grasp of Git fundamentals, you won’t get anywhere. While you’re at it, you should look into the standalone utilities GNU diff and GNU patch; Git is essentially an abstraction on top of these tools.

You should now have enough pointers to begin acquiring knowledge about how to make sense of the Linux kernel (and a whole lot of other things). The aforementioned prerequisites abstract to OS and embedded development and being an effective operator of your computer. These are the tools you really need to know to get anywhere.

All of this stuff applies to several other things. Once you start learning them, you’ll see what I mean. It really isn’t a lot to take in. Knowledge of this stuff will last you a lifetime. Don’t fall for the IDE X or framework Y bullshit; those are moving targets and are deliberately broken to keep people reliant on the dictators for “support”. Educate yourself; it’s the only path to computing freedom. Become an operator; don’t be a mindless consumer.

Appendix C: Digital Multimeter Tests



As always, follow the instructions in the manual of your Digital Multimeter (DMM). RTFM extra carefully, otherwise you end up with magic smoke (why you were recommended spares).

There really are only two simple things you need to test on your UTUB:

● Voltage coming out of the UTUB TX and RX pins.

● Current from the TX and RX pins.

There’s not really much more to be said here. The one bit of general advice is to use a breadboard and some jump wires, if you have access to one; crocodile clip test leads for your DMM also make life easier. Basically, try making sure you don’t short circuit your UTUB by having DMM test leads too close to each other.

Make sure the test leads are plugged into the appropriate terminals of your DMM. Always make sure the fuse of a DMM terminal is sufficient for what you’re measuring.

You can find GPIO voltage specifications of the Raspberry Spy in the official GPIO guide. Make sure you cross-check with the right CPU model’s datasheet.

You may end up needing to buy some resistors to get the right voltage and current. You can find background information useful to the novice hardware hacker from the excellent Sparkfun tutorial on pull-up resistors; follow the appropriate links to fill out gaps in your knowledge. However, most UTUBs are usable out-of-the-box (OOTB) so you shouldn’t really have much issue here. But it doesn’t hurt (unless you zap yourself) to get a bit of electronics background knowledge since you’re playing around with wires and electricity!

Index



[Editor's note: this corresponds to the PDF version of the document]

lsblk -f, 28 sd(4), 34 /dev/ttyUSB0, 23 /proc, 43 /sys, 43 FTDI, 41 apropos(1), 18 cmdline.txt, 29 config.txt, 29 console=fb, 29 cp210x, 23, 24 dmesg(1), 18-20, 22, 25 echo(1), 44 enable_uart=1, 29 grep(1), 20 lsmod(8), 20, 25 lspci -k, 26 lsusb -t, 26 mknod(1), 24 modinfo(8), 19, 20, 23 picocom(1), 17, 24, 32, 33, 35 ttyUSB0, 23, 24 usbcore, 23 usbserial, 23 DMM, 15 EHCI, 20 HCI, 20 idProduct, 25 idVendor, 25 jump wires, 14 kernel ring buffer, 18 KRB, 18 OHCI, 20 PCI, 20 QC, 15 textttmodinfo(8), 25 UART, 17 UTUB, 13, 14

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