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Date: Mon, 4 Nov 2019 15:42:09 -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 10/17] arm64: disable kretprobes with SCS

On Mon, Nov 4, 2019 at 9:05 AM Mark Rutland <> wrote:
> I'm a bit confused as to why that's the case -- could you please
> elaborate on how this is incompatible?
> IIUC kretrobes works by patching the function entry point with a BRK, so
> that it can modify the LR _before_ it is saved to the stack. I don't see
> how SCS affects that.

You're correct. While this may not be optimal for reducing attack
surface, I just tested this to confirm that there's no functional
conflict. I'll drop this and related patches from v5.


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