Re: [PATCH v3 0/7] crypto: x86: Fix indirect function call casts

From: Sami Tolvanen
Date: Thu May 09 2019 - 11:39:49 EST

On Wed, May 08, 2019 at 07:04:40PM -0700, Eric Biggers wrote:
> And I also asked whether indirect calls to asm code are even allowed
> with CFI. IIRC, the AOSP kernels have been patched to remove them from
> arm64

At least with clang, indirect calls to stand-alone assembly functions
trip CFI checks, which is why Android kernels use static inline stubs
to convert these to direct calls instead.