From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226gIisniBwhdlUYFhvznWd7fSSNyfTnnH1tK1UjpvDMJUc72LoDMZUHyBcy2Y3OApSrzdTK ARC-Seal: i=1; a=rsa-sha256; t=1517991504; cv=none; d=google.com; s=arc-20160816; b=BFnSe5nWCxfMlGUXfgUstS63Re2SaZHwu/WmWwqc0wqGGApsF6TOuqf97N8Gl1xOqN ZaD6xUv1EzSSUIf+A5W0gydJQSqybdW1ZyVMX7Tpt887aprf5so+C/LOVFjDmOW/Fg51 vpRJuxG51mvLzEXMR+jSHmBbpDOYN5lTHJan5VakvP3iIuYQnznHyBtwlQjuNKhIItcF ckZV2dCb8ir75TxzCrKAL2PbzHgLoCrg+QNbIBCEzUAlp1I0NGa5ThSCH+uOVZDheREz HCuMJMu3GSfKaOtYzQxvStQdMS26xhKC4JH3dpIHnQM2S3qs3kbbcZC/nXiLe9UHecxE IU4A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=message-id:content-disposition:content-transfer-encoding :mime-version:in-reply-to:references:cc:user-agent:date:subject:to :from:dkim-signature:arc-authentication-results; bh=1Du+GOB9YcpU63pN5CIHQdCOzsS2KmTiWhHPTIBDaBQ=; b=pebQE87D2CQ6K4gWCW+s+/LRG+HZD8BldeaA0wCOo747khVx6BC+Pz4z7BHc+sBofr gfJ9PLl+wMCsoIQKtDci1ScUVfAtTG/8Kf2PYhVf7KXKtefSNiUbr5k0JBPf2exrhlBt MDFeV7OXUFcVDmKpNIadvHgwPSmx9a9cPAH/GaUmi/Lc9Hm9lTLaVwP/TVtN2cJrrRtS hPFAwpIAkfkHbM+TBCSeyotL/o4J7fU3OVz43H/THZtlqIPJVp2nX6dNOJVo5+A9W6Bn KRYBqaIDeyTO/6oYCZ0ljkofVr2FSftvbcqIFdcNQ/LDatPkafnxPpBROJr891Nm0EmC Q5Wg== ARC-Authentication-Results: i=1; mx.google.com; dkim=temperror (no key for signature) header.i=@rainbow-software.org header.s=atlsmtp header.b=CoeHABjY; spf=pass (google.com: domain of linux@rainbow-software.org designates 80.94.52.26 as permitted sender) smtp.mailfrom=linux@rainbow-software.org Authentication-Results: mx.google.com; dkim=temperror (no key for signature) header.i=@rainbow-software.org header.s=atlsmtp header.b=CoeHABjY; spf=pass (google.com: domain of linux@rainbow-software.org designates 80.94.52.26 as permitted sender) smtp.mailfrom=linux@rainbow-software.org From: Ondrej Zary To: whiteheadm@acm.org Subject: Re: [BUG] x86 : i486 reporting to be vulnerable to Meltdown/Spectre_V1/Spectre_V2 Date: Wed, 7 Feb 2018 09:18:18 +0100 User-Agent: KMail/1.9.10 (enterprise35 0.20100827.1168748) Cc: David Woodhouse , Guenter Roeck , "Greg Kroah-Hartman" , Hugh Dickins , dave.hansen@linux.intel.com, jikos@kernel.org, Borislav Petkov , Kees Cook , Jamie Iles , eduval@amazon.com, labbott@redhat.com, Rik van Riel , Thomas Gleixner , linux-kernel@vger.kernel.org References: <1517950494.3677.30.camel@infradead.org> In-Reply-To: X-KMail-QuotePrefix: > MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <201802070918.18978.linux@rainbow-software.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1591354140743903681?= X-GMAIL-MSGID: =?utf-8?q?1591729459266569469?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Tuesday 06 February 2018, tedheadster wrote: > On Tue, Feb 6, 2018 at 3:54 PM, David Woodhouse 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