Messages in this thread | | | From | Ondrej Zary <> | Subject | Re: [BUG] x86 : i486 reporting to be vulnerable to Meltdown/Spectre_V1/Spectre_V2 | Date | Wed, 7 Feb 2018 09:18:18 +0100 |
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On Tuesday 06 February 2018, tedheadster wrote: > On Tue, Feb 6, 2018 at 3:54 PM, David Woodhouse <dwmw2@infradead.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
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