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[$] Restricted DMA
Thursday January 7, 2021. 06:17 PM , from LWN.net
A key component of system hardening is restricting access to memory; this
extends to preventing the kernel itself from accessing or modifying much of the memory in the system most of the time. Memory that cannot be accessed cannot be read or changed by an attacker. On many systems, though, these restrictions do not apply to peripheral devices, which can happily use direct memory access (DMA) on most or all of the available memory. The recently posted restricted DMA patch set aims to reduce exposure to buggy or malicious device activity by tightening up control over the memory that DMA operations are allowed to access.
https://lwn.net/Articles/841916/rss
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