[pdoege]

No. The baseband can DMA what it wants, when it wants. The baseband PMIC can power what it wants when wants. The AP is the junior partner.

[notactuallyben]

This is not true on pretty much any phone post 2014ish. Pretty much all platforms have IOMMU's or similar separation mechanisms. source: did baseband vr commercially

[userbinator]

Not on MTK chipsets, or at least the older ones I'm familiar with:

https://github.com/varunchitre15/MT6589_kernel_source/blob/m...

Look at the enable_mem_access_protection function.

[Analemma_]

Basebands have not had DMA for a long time. There can still be vulnerabilities, which it sounds like is what happened here, but there’s no DMA anymore on new phones.

[p_l]

That was (possibly still is) the case on Qualcomm integrated Application and Baseband SoCs, not on Exynos where baseband is the junior partner.

[flangola7]

IOUMMU prevents this