linux-kernel - Re: [RFC PATCH 00/17] objtool: add base support for arm64

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Message-ID: <20210121142342.GD4588@sirena.org.uk>
Date:   Thu, 21 Jan 2021 14:23:42 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Julien Thierry <jthierry@...hat.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-efi <linux-efi@...r.kernel.org>,
        linux-hardening@...r.kernel.org
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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