It's straightforward to see what the risks to SEP are based on the design https://www.google.com/patents/US8832465 …
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The article doesn't compare attack surface, or talk about Qualcomm failing to isolate different use cases for QSEE.
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It's not a technical whitepaper.
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and the point of my rambly stream of consciousness in the middle was to describe attack surface differences.
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aye, which is where second and third parties can flash it with any access to the /requisite/ software
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Second and third parties cannot flash firmware/OS, and a QSEE vulnerability isn't a Secure Boot vulnerability.
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not legally, easily, or by permission of the OEM, but it sure as hell happens. But yes, not a SB vuln
End of conversation
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