this post was submitted on 16 Sep 2023
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Example: https://grapheneos.org/faq#baseband-isolation
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.
That'd be a huge oversight on their part. Thanks for the clarification.