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Date: Thu, 16 Jan 2020 10:14:24 -0800
From: Sami Tolvanen <>
To: Will Deacon <>
Cc: Catalin Marinas <>, Steven Rostedt <>, 
	Masami Hiramatsu <>, Ard Biesheuvel <>, 
	Mark Rutland <>, Dave Martin <>, 
	Kees Cook <>, Laura Abbott <>, 
	Marc Zyngier <>, Nick Desaulniers <>, Jann Horn <>, 
	Miguel Ojeda <>, 
	Masahiro Yamada <>, 
	clang-built-linux <>, 
	Kernel Hardening <>, 
	linux-arm-kernel <>, LKML <>
Subject: Re: [PATCH v6 12/15] arm64: vdso: disable Shadow Call Stack

On Thu, Jan 16, 2020 at 9:46 AM Will Deacon <> wrote:
> Should we be removing -ffixed-x18 too, or does that not propagate here
> anyway?

No, we shouldn't touch -ffixed-x18 here. The vDSO is always built with
x18 reserved since commit 98cd3c3f83fbb ("arm64: vdso: Build vDSO with


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