linux-kernel - Re: [PATCH] x86: work around clang IAS bug referencing __force

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Date:   Fri, 7 Aug 2020 09:03:59 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Zhenzhong Duan <zhenzhong.duan@...cle.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juergen Gross <jgross@...e.com>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        linux-kernel@...r.kernel.org,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] x86: work around clang IAS bug referencing __force_order

On Fri, Aug 7, 2020 at 12:13 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> Sedat Dilek <sedat.dilek@...il.com> writes:
> > what is the status of this patch?
>
> Just looked at it.
>
> > I needed this one to be able to build VirtualBox via DKMS as an
> > out-of-tree kernel-module.
>
> Not being able to build the vbox rootkit is a feature, not a bug.
>

It must be a funny job to work for Linux/x86.
Keep your humour :-).

We have a second issue hitting this problem when CONFIG_LKDTM=m.
There are more details in CBL issue #1120.
Especially see comments from Nick [2] and user pcc [3].

Thanks.

- Sedat -

[1] https://github.com/ClangBuiltLinux/linux/issues/1120
[2] https://github.com/ClangBuiltLinux/linux/issues/1120#issuecomment-668736160
[3] https://github.com/ClangBuiltLinux/linux/issues/1120#issuecomment-668746486