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Apple and Google Are Introducing New Ways to Defeat Cell Site Simulators, But Is it Enough? (www.eff.org)

submitted 11 months ago by [email protected] to c/[email protected]

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[–] [email protected] 3 points 11 months ago (1 children)

Example: https://grapheneos.org/faq#baseband-isolation

Yes, the baseband is isolated on all of the officially supported devices. Memory access is partitioned by the IOMMU and limited to internal memory and memory shared by the driver implementations...Earlier generation devices we used to support prior to Pixels had Wi-Fi + Bluetooth implemented on a separate SoC. This was not properly contained by the stock OS and we put substantial work into addressing that problem.

Baseband modems were not isolated from kernel memory in stock Android, GrapheneOS had to do it themselves using the IOMMU. We do not know for sure due to the proprietary/closed-source nature of baseband modem drivers, but we have no reason to assume any OEM (Samsung, Xiaomi etc) implemented proper isolation of baseband modem and system memory.

[–] [email protected] 1 points 11 months ago

That'd be a huge oversight on their part. Thanks for the clarification.