Reversing FreeRTOS on embedded devices

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Reverse engineering on Embedded • String analysis does not help • There are no syscalls on <strong>FreeRTOS</strong> • There is no memory protection • IDA by default will not detect the Entry point. ……… can we find the Entry point ? 30 RECON 2017 Brussels
The entry point • STM32 has some default interrupts which are controlled by handlers. • In order to know where is each handler there is table called Interrupt Vector Table, which holds the address for each interrupt. • One of these interrupts is the reset. • What is boot rather then a reset interrupt?! 31 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 and 14: Software Requirements • Needs to
Page 15 and 16: Supported high level functionalitie
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: Reverse engineering on embedded sys
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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