From owner-freebsd-security@freebsd.org Wed Jan 3 19:23:52 2018 Return-Path: Delivered-To: freebsd-security@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E676FEAB445 for ; Wed, 3 Jan 2018 19:23:52 +0000 (UTC) (envelope-from royce.williams@gmail.com) Received: from mail-qt0-x22b.google.com (mail-qt0-x22b.google.com [IPv6:2607:f8b0:400d:c0d::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A5BBD29B6 for ; Wed, 3 Jan 2018 19:23:52 +0000 (UTC) (envelope-from royce.williams@gmail.com) Received: by mail-qt0-x22b.google.com with SMTP id g10so3365896qtj.12 for ; Wed, 03 Jan 2018 11:23:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to; bh=5BNNYQ8hrsIGY0NWyzgp7lBcepLIpus0yCSX3NR92cs=; b=MZzma4lI9/XGaJ0jm/D6NrdM4EPoC3o8sk1YvsMuOpARgJNDohqgs2Q2bnRw0aYYnK aBX5sM5NjTBfwDz3tgrxpM4bskLNg8J54iEO8QU8RUO2/gvGiGIhDJL7+w5Wwz+whOcT coq2nsdWB5FX0M33DkCUpvKYcqlqcryxa6v4sTup951NrRqlZR0DgQ29OUhOxW61ZZVs FKyo1dX1+jeGW4DZ0ngORJwZJ1D4Hl9NAO5j3XiZuYX4xKehrSmSv6bkoKcgTTYQljfR eSePmzclP5itDUA71+vZv3bgqnMzSvRw0ARWswec1B7gsSc+Xf/1SJTBhmKOdOjUPQ8s 3rtg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to; bh=5BNNYQ8hrsIGY0NWyzgp7lBcepLIpus0yCSX3NR92cs=; b=ZCuT8yB0aPJuzLC3X0tK68A4O2rc79rh0LUr1MctHczGfwGsPdyjxzWub96yrl5lF+ 00v5cDfEZx331J1CmzX5t9FqSvSQyDC+4gCOrUMKNUs3qTnpRypUyRtOwCm1m5WH7hZm GIS+rIizXELEAVD6CzpZdn3QhpfBtHy80LxTGqHgSb8z1YfU2bN6wU7zT9CwE4B8q9g9 vtgMI8JNJQW6rbmvnKwHEAfIPnQZsSNZt2AolWrTr+PCG9Zuv4AhxDvwdYKkvrf4Lcwf mRdNMCDOhI31t7Ztur50wk2NAEgAHidddVKRBP1GdB+3EG+4zE0Phaq72V06qOYNHIyH B+GQ== X-Gm-Message-State: AKGB3mJyzpABG28Qvo6Z0KduHGQD2Rz6VmEQ57YRvvVYwFFXPirrJNaT xXYXGIGj+dETnQ+iI4xREOCr9ZNi3m0wHwo88KhluxRg X-Google-Smtp-Source: ACJfBosfa5fgjzzQGoTliyY4evsYN4g+Sfa4SR3x/dY+xGa0V4XoZ8WmY7Xj3MVkkFdnzp9qNpZg19+IogFNP6S1iFk= X-Received: by 10.200.46.149 with SMTP id h21mr3022949qta.73.1515007431387; Wed, 03 Jan 2018 11:23:51 -0800 (PST) MIME-Version: 1.0 Sender: royce.williams@gmail.com Received: by 10.140.104.134 with HTTP; Wed, 3 Jan 2018 11:23:20 -0800 (PST) In-Reply-To: <104827876.20180103220138@serebryakov.spb.ru> References: <477ab39d-286d-d9a2-d31e-fd5f7f1679a8@sentex.net> <7692356.NWgAdSPsLq@elisha.atlnet> <104827876.20180103220138@serebryakov.spb.ru> From: Royce Williams Date: Wed, 3 Jan 2018 10:23:20 -0900 X-Google-Sender-Auth: j51I4iW0HTzRgTg8ed3vD-bqiy0 Message-ID: Subject: Re: Intel hardware bug To: freebsd-security@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Jan 2018 19:23:53 -0000 On Wed, Jan 3, 2018 at 10:01 AM, Lev Serebryakov wrote: > Hello Joey, > > Wednesday, January 3, 2018, 4:56:50 AM, you wrote: > > > No way around it. It's hardware FAIL, and ignoring it isn't an option > since > > it's apparently a huge hole. > Looks like there IS way around it and it was "silently" committed to Linux > > http://pythonsweetness.tumblr.com/post/169166980422/the- > mysterious-case-of-the-linux-page-table > > But TLB flush on each syscall (twice) will slow down system, of course, so > there should be option to disable it. > For what it's worth, this purports to be a PoC: https://gist.github.com/dougallj/f9ffd7e37db35ee953729491cfb71392 Royce