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Jul

04

DC9723 – Exploiting LD_PRELOAD slides and code examples

Filed Under (C, Code injection, Coding, Compilers, DC9723, Hacking, Linux, Linux kernel, Open source, Reverse engineering, Social, Tips & tricks) by 2of1 on 04-07-2011

Here are the slides and code examples of the talk that I gave at the 7th DC9723 meet a few weeks ago.

To all those that came; thanks – I hope you found it interesting!

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May

24

JS/Linux – Linux running in a x86 JavaScript emulator!

Filed Under (Coding, Linux, Open source) by 2of1 on 24-05-2011

Just too cool: http://bellard.org/jslinux/

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Mar

29

Hebrew, Wine and Ubuntu

Filed Under (Linux, Open source, Tips & tricks) by 2of1 on 29-03-2011

If you’re having problems with Hebrew text coming up all garbled with Wine under Ubuntu, here’s the solution:
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Mar

24

Binary output using od, cut and perl

Filed Under (Linux, Open source, Tips & tricks) by 2of1 on 24-03-2011

I came across a one-liner for printing a byte in binary embedded in an article on AVR fuses (http://electrons.psychogenic.com/modules/arms/art/14/AVRFusesHOWTOGuide.php).

I’ve extended this one-liner to output all bytes of a target in binary:
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Mar

21

Cross-compiling x86 from x86_64

Filed Under (C, Coding, Compilers, Linux, Open source, Tips & tricks) by 2of1 on 21-03-2011

Here are two easy ways to compile 32-bit binaries on a 64-bit system.
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Mar

03

Decompressing ZLIB images

Filed Under (Hacking, Open source, Reverse engineering) by 2of1 on 03-03-2011

Often embedded images sit compressed (deflated) on the flash. Usually the bootloader is responsible for decompressing (inflating) the image and loading it into RAM.

I come across these quite often in the embedded reverse engineering work I do (dumping compressed flash mem).
I finally decided to write a simple python script to do the job of decompression (excuse the python, not my strongest skill :) ).
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Feb

23

My little preloader

Filed Under (Linux, Open source, Preloader) by 2of1 on 23-02-2011

OK, my thoughts have been coming together since the last DefCon group meeting and my ‘preloader’ is taking shape.
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Feb

16

DCG9723 February meet

Filed Under (Open source, Social) by 2of1 on 16-02-2011

Thanks to all who organised / presented at the DCG meeting last night.
This was the first time I attended and I really had a good time; I’ll definitely be coming back!
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Jan

09

USB<->UART boards have arrived

Filed Under (Hardware, Open source, PCBs) by 2of1 on 09-01-2011

I received the FT2232D and FT232RL boards over a month ago but haven’t had the time to populate them until now.
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Nov

23

Making sense of strcmp()

Filed Under (C, Coding, Open source) by 2of1 on 23-11-2010

Peter van der Linden brought up a point regarding strcmp() his book Expert C Programming: Deep C Secrets that I found interesting.
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