linux-kernel - Re: [BUG] x86 : i486 reporting to be vulnerable to Meltdown/Spectre_V1/Spectre

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Date:   Wed, 7 Feb 2018 09:18:18 +0100
From:   Ondrej Zary <linux@...nbow-software.org>
To:     whiteheadm@....org
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Hugh Dickins <hughd@...gle.com>, dave.hansen@...ux.intel.com,
        jikos@...nel.org, Borislav Petkov <bp@...en8.de>,
        Kees Cook <keescook@...omium.org>,
        Jamie Iles <jamie@...ieiles.com>, eduval@...zon.com,
        labbott@...hat.com, Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [BUG] x86 : i486 reporting to be vulnerable to Meltdown/Spectre_V1/Spectre_V2

On Tuesday 06 February 2018, tedheadster wrote:
> On Tue, Feb 6, 2018 at 3:54 PM, David Woodhouse <dwmw2@...radead.org> wrote:
> > On Tue, 2018-02-06 at 15:45 -0500, tedheadster wrote:
> >> If that is correct (and I might be wrong), then I am up to date and I
> >> am still getting the following in /proc/cpuinfo on my Pentium 4M i686:
> >>
> >> bugs  : cpu_meltdown spectre_v1 spectre_v2
> >
> > That's expected for now. The CPUs we exempt are as follows:
> >
> > static const __initdata struct x86_cpu_id cpu_no_speculation[] = {
> >         { X86_VENDOR_INTEL,     6, INTEL_FAM6_ATOM_CEDARVIEW,  
> > X86_FEATURE_ANY }, { X86_VENDOR_INTEL,     6, INTEL_FAM6_ATOM_CLOVERVIEW,
> >  X86_FEATURE_ANY }, { X86_VENDOR_INTEL,     6, INTEL_FAM6_ATOM_LINCROFT, 
> >   X86_FEATURE_ANY }, { X86_VENDOR_INTEL,     6, INTEL_FAM6_ATOM_PENWELL, 
> >    X86_FEATURE_ANY }, { X86_VENDOR_INTEL,     6,
> > INTEL_FAM6_ATOM_PINEVIEW,    X86_FEATURE_ANY }, { X86_VENDOR_CENTAUR,   5
> > },
> >         { X86_VENDOR_INTEL,     5 },
> >         { X86_VENDOR_NSC,       5 },
> >         { X86_VENDOR_ANY,       4 },
> >         {}
> > };
> >
> > Alan is going to improve that list, but your Pentium 4 isn't on it yet.
> >
> > The bugs went away on the 486 though, right?
>
> Okay, recompiled for the i486 and it reports no bugs.
>
> As for the i686, it is really a "Mobile Pentium 4 HT" Prescott series
> (https://ark.intel.com/products/27368/Mobile-Intel-Pentium-4-Processor-532-
>supporting-HT-Technology-1M-Cache-3_06-GHz-533-MHz-FSB). Does that make it a
> 'speculative execution' processor?
>
> Thank you for the help and I'll test more of the museum pieces.
>
> - Matthew

What about Pentium II and 3? I'm using 5 such machines (and also a Pentium 
MMX). I've tried a spectre test before and it wasn't reading anything useful. 
Don't know about meltdown. Is there a complete test program? (The web is so 
full of crap that even google can't find anything useful.)

-- 
Ondrej Zary