Received: by 2002:a05:6358:a55:b0:ec:fcf4:3ecf with SMTP id 21csp134145rwb; Thu, 12 Jan 2023 04:30:21 -0800 (PST) X-Google-Smtp-Source: AMrXdXuapViTrf7c4a1FOoLezAYBsr0qerzBevaOsA9/7q8bzuUFfw2vhkrw8hOianUkgoWcXrvY X-Received: by 2002:a05:6402:e09:b0:46c:b919:997f with SMTP id h9-20020a0564020e0900b0046cb919997fmr69039890edh.17.1673526621627; Thu, 12 Jan 2023 04:30:21 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673526621; cv=none; d=google.com; s=arc-20160816; b=RD3K4YEWUDiHt1Gs/RnO3GN5CwH4dF0/lT3eS25Q/8cwURrJhcd+C10m/TYTMfltEC IsBuL4uE4buj8E49gnOkVF/4QO3nne7maCPvNWOVhURhbY2H3OuZhjtb5ZDe3xKlFSee Jomkrsf52YUg8CWm7gUudOBKzXV3W8MVaT4ZCAqwPVdhLuqFBSEqcdFqDsxOmgOJblHn y4cf1i2huUA4V5/RoBorYdad3gNz51opOlIa9K/JZbjDTxiW03m1GRsbdzZVPH5fP9H0 Mc477hq9b6/yKqHO3LI05zCEr+xxH3o2GTIa2uQvs9w6/gdRg5DFLEiNhvQNuOtqijF8 6yyA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=VEu3Q1moApa2dK72HY6h2xEc+p/QX+YGFb++a93yE1w=; b=TE79vi1iglsUlHii2ToH5EzKnqjaCFFhnqm57GWLYIKzstwo2Wba9MO22IyjCqGjRY HsgPsl7QjLyfFF9RnmxrsNyXnJyMrxcqangkwXNnBXPFmnrcO4I7FLLNBDAV9wWUuc4p sof+mHNj5fipYt063VqqQj86J1eQ5KCid+097nIyQPOifLVio6wR+6pS3hXz5abxfnBB 8cQIAOLfJCQ7OLf5Av8gUoPIwXSA20Vtr5p44eVnE+xljRl600+elPCoNEciBiggX+bZ JUT/Fnz1RFQioiC4l4h0DZOjzCdu2dX9soY01Da/iia4OLYqjdB162kj7uCOaPvgvR4e 6A0Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b=FnSZsgXW; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id d28-20020a056402517c00b0047f76f5cb0esi16542113ede.525.2023.01.12.04.30.09; Thu, 12 Jan 2023 04:30:21 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b=FnSZsgXW; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234004AbjALLlI (ORCPT + 49 others); Thu, 12 Jan 2023 06:41:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230194AbjALLkY (ORCPT ); Thu, 12 Jan 2023 06:40:24 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CE84058324 for ; Thu, 12 Jan 2023 03:30:43 -0800 (PST) Received: from zn.tnic (p5de8e9fe.dip0.t-ipconnect.de [93.232.233.254]) (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 724821EC05F1; Thu, 12 Jan 2023 12:30:42 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1673523042; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=VEu3Q1moApa2dK72HY6h2xEc+p/QX+YGFb++a93yE1w=; b=FnSZsgXWMn/EDEz12m29pdcXc/xvbhi+HhkpC1CAYHcGm+qWedGBYyEZYHAjeB7JYDgZb0 RikyRQgrVm0eMV3IW8razXbBnO/TX/cjZjxyKnoxWkBBno4txfZvmth3e2u4X722pFwgJc 8FKUJvUCwGcqFaHTlxZE9sV2ciIIwgc= Date: Thu, 12 Jan 2023 12:30:42 +0100 From: Borislav Petkov To: "H. Peter Anvin" Cc: "Maciej W. Rozycki" , "Jason A. Donenfeld" , Thomas Gleixner , Ingo Molnar , Dave Hansen , x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] x86: Disable kernel stack offset randomization for !TSC Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 11, 2023 at 05:53:37PM -0800, H. Peter Anvin wrote: > Not to mention that we could use rdrand here if it is available (although it > is slower than rdtsc.) Yeah, no RDRAND on 486. :) -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette