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Date:   Thu, 21 Jan 2021 14:23:42 +0000
From:   Mark Brown <>
To:     Julien Thierry <>
Cc:     Ard Biesheuvel <>,
        Linux Kernel Mailing List <>,
        Linux ARM <>,
        Catalin Marinas <>,
        Will Deacon <>,
        Masahiro Yamada <>,
        Kees Cook <>,
        Michal Marek <>,
        Josh Poimboeuf <>,
        Peter Zijlstra <>,
        Mark Rutland <>,
        linux-efi <>,
Subject: Re: [RFC PATCH 00/17] objtool: add base support for arm64

On Thu, Jan 21, 2021 at 02:23:53PM +0100, Julien Thierry wrote:
> On 1/21/21 12:08 PM, Ard Biesheuvel wrote:

> > I am not aware of any plans to enable this in GCC, but the Clang
> > implementation is definitely intended for production use (it's a CFI
> > feature for ROP/JOP mitigation)

> I think most people interested in livepatching are using GCC built kernels,
> but I could be mistaken (althought in the long run, both compilers should be
> supported, and yes, I realize the objtool solution currently only would
> support GCC).

There definitely seem to be some users interested in both livepatch and
clang built kernels so it might come up relatively quickly.

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