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Date: Fri, 1 Nov 2019 13:32:46 -0700
From: Sami Tolvanen <>
To: Kees Cook <>
Cc: Will Deacon <>, Catalin Marinas <>, 
	Steven Rostedt <>, Masami Hiramatsu <>, 
	Ard Biesheuvel <>, Dave Martin <>, 
	Laura Abbott <>, Mark Rutland <>, 
	Nick Desaulniers <>, Jann Horn <>, 
	Miguel Ojeda <>, 
	Masahiro Yamada <>, 
	clang-built-linux <>, 
	Kernel Hardening <>, 
	linux-arm-kernel <>, LKML <>
Subject: Re: [PATCH v3 11/17] arm64: disable function graph tracing with SCS

On Thu, Oct 31, 2019 at 8:58 PM Kees Cook <> wrote:
> IIRC, the argument was to disable these on a per-arch basis instead of
> doing it as a "depends on !SHADOW_CALL_STACK" in the top-level function
> graph tracer Kconfig?

Yes, that's correct.

> (I'm just thinking ahead to doing this again for
> other architectures, though, I guess, there is much more work than just
> that for, say, x86.)

We can always change this later if needed, and possibly figure out how
to make function graph tracing and kretprobes work with SCS.


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