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From:   Sedat Dilek <sedat.dilek@gmail.com>
Date:   Fri, 7 Aug 2020 09:03:59 +0200
Message-ID: <CA+icZUWpbYDJ7CnVOsWG9paoi-EHpzW2=ERYK=GeR2z9WtJCbw@mail.gmail.com>
Subject: Re: [PATCH] x86: work around clang IAS bug referencing __force_order
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Arnd Bergmann <arnd@arndb.de>, Ingo Molnar <mingo@redhat.com>,
        Borislav Petkov <bp@alien8.de>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Zhenzhong Duan <zhenzhong.duan@oracle.com>,
        Kees Cook <keescook@chromium.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Juergen Gross <jgross@suse.com>,
        Andy Lutomirski <luto@kernel.org>,
        Andrew Cooper <andrew.cooper3@citrix.com>,
        linux-kernel@vger.kernel.org,
        Clang-Built-Linux ML <clang-built-linux@googlegroups.com>
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On Fri, Aug 7, 2020 at 12:13 AM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> Sedat Dilek <sedat.dilek@gmail.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