Reversing FreeRTOS on embedded devices

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Introducing Free RTOS • Small and very lean RTOS developed by Real Time Engineers Ltd • Free and open source environment (there is a commercial version) • Runs on almost everything (30+ platform supported oob) • Yes, even Arduino • Easy to customize for new platforms ̶ port.c, portasm.s and portmacro.h needs to be ported for a new platform • Widely supported by open source community • Preemptive and cooperative multitasking • Tickles mode of operation supported • Tiny footprint • More details: www.freertos.org 14 RECON 2017 Brussels
Supported high level functionalities • Custom developed TCP and UDP IP stack • FAT FS • CLI • I/O support including GPIO 15 RECON 2017 Brussels
Page 1 and 2: Reversing
Page 3 and 4: About us - Vladan • Senior Managi
Page 5 and 6: Why? • Recent project challenges
Page 7 and 8: …To Embedded • Usually around s
Page 9 and 10: Tools of choice • IDA Pro • Cap
Page 11 and 12: Main constraints • Limited amount
Page 13: Software Requirements • Needs to
Page 17 and 18: FreeRTOS main comp
Page 19 and 20: ̶ ̶ ̶ Security Features overview
Page 21 and 22: ̶ ̶ Sample application • Sample
Page 23 and 24: Application architecture C O R E Bu
Page 25 and 26: Run // LED connected to GPIO port P
Page 27 and 28: What is next? • Now we have creat
Page 29 and 30: Reverse engineering on embedded sys
Page 31 and 32: The entry point • STM32 has some
Page 33 and 34: The entry point - IVT raw • Conte
Page 35 and 36: The entry point - Reset Handler Now
Page 37 and 38: Reverse engineering on STM32F0 •
Page 39 and 40: IDA Plugin - Functions manipulating
Page 41 and 42: Reverse engineering on STM32F0 •
Page 43 and 44: Critical code decoding and listing
Page 45 and 46: Interesting registers 45 RECON 2017
Page 47: THANK YOU

Reversing FreeRTOS on embedded devices

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