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Date: Mon, 4 Nov 2019 15:44:39 -0800
From: Sami Tolvanen <>
To: Mark Rutland <>
Cc: Will Deacon <>, Catalin Marinas <>, 
	Steven Rostedt <>, Masami Hiramatsu <>, 
	Ard Biesheuvel <>, 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 v4 11/17] arm64: disable function graph tracing with SCS

On Mon, Nov 4, 2019 at 9:11 AM Mark Rutland <> wrote:
> Can you please elaborate on _how_ this is incompatible in the commit
> message?
> For example, it's not clear to me if you mean that's functionally
> incompatible, or if you're trying to remove return-altering gadgets.
> If there's a functional incompatibility, please spell that out a bit
> more clearly. Likewise if this is about minimizing the set of places
> that can mess with control-flow outside of usual function conventions.

Sure, I'll add a better description in v5. In this case, the return
address is modified in the kernel stack, which means the changes are
ignored with SCS.


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