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Implement NX (w^x) support #432

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vathpela opened this issue Nov 3, 2021 · 0 comments · Fixed by #459
Closed

Implement NX (w^x) support #432

vathpela opened this issue Nov 3, 2021 · 0 comments · Fixed by #459
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@vathpela
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vathpela commented Nov 3, 2021

A couple of things need to be done to correctly support NX:

  • we need to be able to modify page mapping flags (https://mantis.uefi.org/mantis/view.php?id=2262)
  • load_image() needs to know how to map binary sections with the correct flags
  • Currently have no idea how the firmware loader (and shim's load_image() as well) can detect whether a binary is safe (or not) to load with NX, i.e. if it needs all mappings to be executable OR UEFI_MEMORY_ATTRIBUTE present in order to function correctly.
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Add support for NX (W^X) mitigations. vathpela/mallory
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@frozencemetery @vathpela