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Date: Wed, 6 Nov 2019 05:45:49 +0100
From: Miguel Ojeda <>
To: Sami Tolvanen <>
Cc: Will Deacon <>, Catalin Marinas <>, 
	Steven Rostedt <>, Masami Hiramatsu <>, 
	Ard Biesheuvel <>, Dave Martin <>, 
	Kees Cook <>, Laura Abbott <>, 
	Mark Rutland <>, Marc Zyngier <>, 
	Nick Desaulniers <>, Jann Horn <>, 
	Masahiro Yamada <>, 
	clang-built-linux <>, 
	Kernel Hardening <>, 
	Linux ARM <>, 
	linux-kernel <>
Subject: Re: [PATCH v5 11/14] arm64: efi: restore x18 if it was corrupted

On Wed, Nov 6, 2019 at 12:56 AM Sami Tolvanen <> wrote:
> If we detect a corrupted x18 and SCS is enabled, restore the register
> before jumping back to instrumented code. This is safe, because the
> wrapper is called with preemption disabled and a separate shadow stack
> is used for interrupt handling.

In case you do v6: I think putting the explanation about why this is
safe in the existing comment would be best given it is justifying a
subtlety of the code rather than the change itself. Ard?


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