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Date: Thu, 7 Feb 2019 18:11:45 +0100
From: Borislav Petkov <>
To: Thomas Garnier <>
Cc: Kernel Hardening <>,
	Kristen Carlson Accardi <>,
	Thomas Gleixner <>,
	Ingo Molnar <>, "H. Peter Anvin" <>,
	the arch/x86 maintainers <>,
	"Peter Zijlstra (Intel)" <>,
	Ard Biesheuvel <>,
	Nadav Amit <>,
	Masahiro Yamada <>,
	LKML <>
Subject: Re: [PATCH v6 02/27] x86: Use symbol name in jump table for PIE

On Thu, Feb 07, 2019 at 09:04:45AM -0800, Thomas Garnier wrote:
> I assume that's an optimisation done by gcc later.

So why is that change even needed? Where does it break?

> The P modifier in the documentation does state that it is used to
> generate PIC code.

The documentation says:

"If used for a function, print the PLT suffix and generate PIC code. For
example, emit foo@PLT instead of ’foo’ for the function foo()."

when you use %P for a function. Which is not how it is used here.


Good mailing practices for 400: avoid top-posting and trim the reply.

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