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Date: Thu, 9 May 2019 08:38:28 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Eric Biggers <ebiggers@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Joao Moreira <jmoreira@...e.de>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.org>,
	linux-crypto <linux-crypto@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v3 0/7] crypto: x86: Fix indirect function call casts

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.

Sami

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