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Date: Tue, 22 Oct 2019 07:54:07 +0200
From: Ard Biesheuvel <>
To: Sami Tolvanen <>
Cc: Will Deacon <>, Catalin Marinas <>, 
	Steven Rostedt <>, Dave Martin <>, 
	Kees Cook <>, Laura Abbott <>, 
	Mark Rutland <>, Nick Desaulniers <>, 
	clang-built-linux <>, 
	Kernel Hardening <>, 
	linux-arm-kernel <>, 
	Linux Kernel Mailing List <>
Subject: Re: [PATCH 14/18] arm64: efi: restore x18 if it was corrupted

On Tue, 22 Oct 2019 at 00:40, Sami Tolvanen <> wrote:
> On Sun, Oct 20, 2019 at 11:20 PM Ard Biesheuvel
> <> wrote:
> > You'll have to elaborate a bit here and explain that this is
> > sufficient, given that we run EFI runtime services with interrupts
> > enabled.
> I can add a note about this in v2. This is called with preemption
> disabled and we have a separate interrupt shadow stack, so as far as I
> can tell, this should be sufficient. Did you have concerns about this?

No concerns, but we should put the above clarification in the commit log.

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