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KPTI+CFI on x86 trips over something in entry code #23

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kees opened this issue Nov 21, 2019 · 0 comments
Open

KPTI+CFI on x86 trips over something in entry code #23

kees opened this issue Nov 21, 2019 · 0 comments
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Feature: CFI [ARCH] x86_64

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@kees
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@kees kees commented Nov 21, 2019

https://outflux.net/blog/archives/2019/11/20/experimenting-with-clang-cfi-in-upstream-linux/

There seems to be some generated code that is being run at syscall entry that is not mapped. I suspect there is something still doing CFI checks on entry (and their resulting jump tables are missing), but I haven't found them yet. For now, disable KPTI under CFI (at run time, so test kernels can still boot with "pti" to enable it again).
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