Received: by 10.223.176.5 with SMTP id f5csp455239wra; Tue, 30 Jan 2018 14:19:14 -0800 (PST) X-Google-Smtp-Source: AH8x226kyUEBKcCW6w7UQdCxKZg0cP1lTiytX51UqcghLv5TZNlj3GDR8TVKA4odu55z+9a4/EWp X-Received: by 2002:a17:902:8f8a:: with SMTP id z10-v6mr25869790plo.395.1517350754131; Tue, 30 Jan 2018 14:19:14 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1517350754; cv=none; d=google.com; s=arc-20160816; b=FbSKfNn+MFmkhMbU2v1UB5h/E+ui0+l+2S345vfPRw86ZUNxChQBBFTDCPjossmr/X akE3xaVqWsof4u7R5NM8y5dzkN49tqPDoqRnaq04wJsAysfwjJvfhYFOl+6T8wb0bV7h Xb8u/esiKX/VKTxoLxumGJKbF54AlE0nO9t8OWcAlR82T7gF+tqlnnaNTdmeXIX/1i38 IQoq+r//e8rSuMzL0R8xORyRrA5enLoHpALswQLrM+KdOq4lJ/jn4MuQfyAX6HNDj85r t3U/5dwJnOgxYiYvESdsX/MjVR0aYFjHEiiZfzUPUl0sDB38Xb3OpP08pFxB9LV5Ri+i nC/g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:arc-authentication-results; bh=1BImLqRFORVdsb5IqdYUWgmuR7KogvRwSDYXYrzN7kM=; b=dvpZQ3vmcWvBVa0fTkJ67YHy4ltAe5hCYJj0CUqdrOBn6rOFtbgEspTVUypPELf239 DsQJyXZgKNyHBJZNbyF/kuG5eza8jULyAu+cVvwwjiZNtHwKDN628vY4X19gREICD9ru wkzFV165GF0rganguJgoFOIHEGvRC9QRficode42i3F1O4NogpF6xJd+rSnOAAiUe9VE Ad0n7d/g/UM76EoV0R9ir9HD2yf3WCe6H7IVNPDhgJYcN+3lNsa/REMc2cHUmUc+JyZR 3Tjb35gby4KuPTgfxbBngTwIlVyplJFrdnNOPvEqkotuAAWddkT2+FAk03wK3UcEIEn1 9hLg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id x63si322116pfk.335.2018.01.30.14.18.59; Tue, 30 Jan 2018 14:19:14 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753372AbeA3V5i (ORCPT + 99 others); Tue, 30 Jan 2018 16:57:38 -0500 Received: from mail.skyhub.de ([5.9.137.197]:49930 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752163AbeA3V5h (ORCPT ); Tue, 30 Jan 2018 16:57:37 -0500 X-Virus-Scanned: Nedap ESD1 at mail.skyhub.de Received: from mail.skyhub.de ([127.0.0.1]) by localhost (blast.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id q2ORxWwgzE3p; Tue, 30 Jan 2018 22:57:36 +0100 (CET) Received: from pd.tnic (p200300EC2BCF0F005D4DFBFD0E3B986B.dip0.t-ipconnect.de [IPv6:2003:ec:2bcf:f00:5d4d:fbfd:e3b:986b]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id D48421EC0270; Tue, 30 Jan 2018 22:57:35 +0100 (CET) Date: Tue, 30 Jan 2018 22:57:31 +0100 From: Borislav Petkov To: Tim Chen Cc: David Woodhouse , arjan@linux.intel.com, tglx@linutronix.de, karahmed@amazon.de, x86@kernel.org, linux-kernel@vger.kernel.org, peterz@infradead.org, pbonzini@redhat.com, ak@linux.intel.com, torvalds@linux-foundation.org, gregkh@linux-foundation.org, mingo@kernel.org, luto@kernel.org, linux@dominikbrodowski.net Subject: Re: [PATCH] x86/speculation: Use Indirect Branch Prediction Barrier in context switch Message-ID: <20180130215731.pszc5u4gcc32ds4v@pd.tnic> References: <1517263487-3708-1-git-send-email-dwmw@amazon.co.uk> <20180130203836.bsgme6kf6hstgbrx@pd.tnic> <024dd53b-1912-34fa-deb8-550c111df521@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <024dd53b-1912-34fa-deb8-550c111df521@linux.intel.com> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 30, 2018 at 01:03:20PM -0800, Tim Chen wrote: > So it doesn't seem to be very practical attack if the victim has set > itself to be non-dumpable. Probably, but considering how cheap our fix is, we might just as well plug that hole too. -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.