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Reverse Engineering: Shannon Bootloader Dump protocol #8

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grant-h opened this issue Mar 5, 2021 · 0 comments
Open

Reverse Engineering: Shannon Bootloader Dump protocol #8

grant-h opened this issue Mar 5, 2021 · 0 comments

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@grant-h
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grant-h commented Mar 5, 2021

Newer basebands have protection against memory dumping through a mysterious TBL structure in the bootload. I suspect this is from TrustZone or SBOOT as I can't see any reference to it in the kernel sources. A field in this TBL structure is read by the modem bootloader when entering into dump magic mode. This field describes the security state of the device and if unlocked, a dump of the modem cannot be made ever again (at least without a trustzone exploit or bootloader exploit). Investigate the data that CBD can send to the modem bootloader. Can it influence its operation?
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