Battery Firmware Hacking - Hacker Halted

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Which chip? Its a long story... Each chip returns slightly different data flash lengths for each “subclass” I wrote a script to get these values and then manually looked for this “fingerprint” in all the TI design docs Eventually found one that matched Note: I really don’t like to mess with hardware! Sunday, October 2, 11
Data flash signature SubclassID:bytes returned 0: 22 1: 25 2: 10 3: 1 ... Sunday, October 2, 11
Page 1 and 2: Battery Firmware Hacking Charlie Mi
Page 3 and 4: About me Former US National Securit
Page 5 and 6: Spoiler I didn’t blow up batterie
Page 7 and 8: Smart battery “Safety is a primar
Page 9 and 10: Possible Battery Attacks Brick batt
Page 11 and 12: How to start I suck at hardware, so
Page 13 and 14: AppleSmartBattery Is part of PowerM
Page 15 and 16: One odd thing What’s up with 0x36
Page 17 and 18: Double win! We now know its some ki
Page 19: Double win! We now know its some ki
Page 23 and 24: Data flash signature SubclassID:byt
Page 25 and 26: Data flash signature SubclassID:byt
Page 27 and 28: Step 2 Sunday, October 2, 11
Page 29 and 30: Step 4 Chips and stuff Sunday, Octo
Page 31 and 32: Thx: Travis Goodspeed Sunday, Octob
Page 33 and 34: Sunday, October 2, 11
Page 35 and 36: Digression We now know what kind of
Page 37 and 38: Using the API Sunday, October 2, 11
Page 39 and 40: Lots to do! There are many interest
Page 41 and 42: Different modes Sealed Unsealed Ful
Page 43 and 44: Unsealed Access to Data Flash space
Page 45 and 46: Configuration mode By issuing SMBus
Page 47 and 48: Other calibrations? Sunday, October
Page 49 and 50: Other calibrations? Yes, I’m a pr
Page 51 and 52: q20z80evm-001 An evaluation system
Page 53 and 54: The software Sunday, October 2, 11
Page 55 and 56: Data flash Sunday, October 2, 11
Page 57 and 58: EVM It can flash the firmware with
Page 59 and 60: Introspection Wrote a PyDbg script
Page 61 and 62: Google again Googling these types o
Page 63 and 64: Boot ROM - mostly ok See how to wri
Page 65 and 66: Let’s ask TI! Sunday, October 2,
Page 67 and 68: Plz! Sunday, October 2, 11
Page 69 and 70: Intellectual property - Here I come
Page 71 and 72:
Intellectual property - Here I come
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3 byte aligned Probably 3 byte alig
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3 byte aligned Probably 3 byte alig
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The end Ends in 23 ff ff Then lots
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Back to google Sunday, October 2, 1
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CoolRISC 816 8-bit micro controller
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Instruction set Sunday, October 2,
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IDA! Create a few small sections, o
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More IDA Initial disassembly doesn
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Boot ROM Problems Now can dump and
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Battery wasteland Sunday, October 2
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Try an off-market knockoff Actually
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Problem 2 If you patch a few bytes
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Checksum checker (old) Sunday, Octo
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Disable checksum Older: Set stored
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Patch it! patch_firmware function p
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Sniffing SMBus Bought some (more) h
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Spaghetti wire fail Sunday, October
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Pop the keyboard Sunday, October 2,
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i2c decoding Write, SBS command 0x8
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Beagle data Sunday, October 2, 11
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Implications Brick the battery Chan
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Firmware changes It might be intere
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SMBus MITM Remaining Capacity (0xf)
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We redirect to cases 1b-1c int work
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Re-sniffing Shows all values querie
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Deal breaker? MU092X Thermal cutoff
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Fuzzing the SMBus Options Write a f
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Caulkgun source - guts #include #i
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