22C3 - 2.2

22nd Chaos Communication Congress
Private Investigations

Speakers
Harald Welte
Schedule
Day 3
Room Saal 1
Start time 17:00
Duration 01:00
Info
ID 768
Event type Lecture
Track Hacking
Language English
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Towards the first Free Software GSM Phone

Reverse Engineering the Motorola EZX (A768,A780,E680) series of Linux-based GSM phones

This presentation describes the progress of hacking and extending the Motorola series of Linux based Smartphones, with the ultimate goal to replace all proprietary applications with 100% free software.

It's been two years since Motorola has released the first Linux Smartphone (A768). More recently, two new models were introduced, the A780 and the E680, the former even officially distributed in Germany and all over the EU.

What's so special about a Linux based smartphone? It's special because the Linux kernel acts as an enabler for 3rd party hacks and 3rd party software, like it can be observed with the OpenWRT, OpenTom, NSLU2-Linux, OpenEmbedded, OpenZaurus and other similar projects.

The author of this presentation has sucessfully obtained "telnet" access to an A780 cellphone, built a matching cross-compilation toolchain and installed various applications for debugging, such as busybox, iptables, nmap, lsof, strace, etc.

While re-engineering efforts are still in a early stage, work is proceeding extremely fast, and important pieces such as the protocol between the PXA270 frontend processor and the ARM7TDMI GSM processor have already been partially re-engineered. The project is expected to progress significantly until 22C3.