From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97071C433DB for ; Mon, 22 Feb 2021 10:08:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 437C964E20 for ; Mon, 22 Feb 2021 10:08:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230507AbhBVKH7 (ORCPT ); Mon, 22 Feb 2021 05:07:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58504 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230400AbhBVKEj (ORCPT ); Mon, 22 Feb 2021 05:04:39 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 18C0BC061574; Mon, 22 Feb 2021 02:03:59 -0800 (PST) Received: from zn.tnic (p200300ec2f040200a034b7f44a0c99a8.dip0.t-ipconnect.de [IPv6:2003:ec:2f04:200:a034:b7f4:4a0c:99a8]) (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 7C1BF1EC0323; Mon, 22 Feb 2021 11:03:57 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1613988237; 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=ma8MTpa/HAoIYU2Q1MpEZ5f2KXXnT+TVIKxovE2CQpU=; b=bEexuLfS2GrmfGCk1rhZVJSCS1Mg1KHxQiH9ZgD7+a+cTq0TVVx6qksNl3POWsLMehkWS/ 8zQXCU/PyU1qaIX8s//s8sIFstPPaHfD1pTdS78iLfrHdTLvyGVxyiukPphk9mWrW5iCMD c6CgPbkJdZ7J5sZUQh+2q84j2Sv4rDM= Date: Mon, 22 Feb 2021 11:03:56 +0100 From: Borislav Petkov To: Aili Yao Cc: tony.luck@intel.com, mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com, x86@kernel.org, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, yangfeng1@kingsoft.com Subject: Re: [PATCH v2] x86/mce: fix wrong no-return-ip logic in do_machine_check() Message-ID: <20210222100356.GB29063@zn.tnic> References: <20210222113124.35f2d552@alex-virtual-machine> <20210222115007.75b7de9b@alex-virtual-machine> <20210222092403.GA29063@zn.tnic> <20210222173109.7b7ac42a@alex-virtual-machine> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210222173109.7b7ac42a@alex-virtual-machine> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Feb 22, 2021 at 05:31:09PM +0800, Aili Yao wrote: > you can inject a memory UE to a VM, it should always be MCG_STATUS_RIPV 0. So the signature you injected is not something the hardware would generate - you just didn't set MCG_STATUS_RIPV. If so, why should the code handle invalid signatures which the harware cannot generate? -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette