linux-kernel - Re: [GIT PULL] x86/urgent for v5.11-rc7

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Date:   Sun, 7 Feb 2021 16:45:40 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Borislav Petkov <bp@...e.de>, Dave Hansen <dave.hansen@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>, x86-ml <x86@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [GIT PULL] x86/urgent for v5.11-rc7

On Sun, Feb 07, 2021 at 10:15:49AM -0800, Linus Torvalds wrote:
> On Sun, Feb 7, 2021 at 9:58 AM Borislav Petkov <bp@...e.de> wrote:
> >
> > It probably is an item on some Intel manager's to-enable list. So far,
> > the CET enablement concentrates only on userspace but dhansen might know
> > more about future plans. CCed.
> 
> I think the new Ryzen 5000 series also supports CET, but I don't have
> any machines to check.
> 
> Hopefully somebody ends up with hardware that supports it and a urge
> to try to make it work in kernel land too.
> 
> I do suspect involved people should start thinking about how they want
> to deal with functions starting with
> 
>         endbr64
>         call __fentry__
> 
> instead of the call being at the very top of the function.

FWIW, objtool's already fine with it (otherwise we would have discovered
the need to disable fcf-protection much sooner).

-- 
Josh