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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 3E2C5C169C4 for ; Mon, 11 Feb 2019 15:51:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0DAB121855 for ; Mon, 11 Feb 2019 15:51:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549900291; bh=isYRB4vcDV+9G1nICICJGjLx4sPd8oGv+q0tWbOF/uY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=odGUxHL4H+Yn0EZ+RJilSh5z7DXrmVFihngvlr+GZSarn74lngZZnnZ3iUw/LCgrs kRutxbbV1qbJ0zTvNAzmbAP5pdC/HfheZTk7aSTohhy3HEuYNwnIXkOBkZlQxZ+/Ss CauWZFUDMSq7tx6YvNfT0f4keREpy5+e7gTZX+FY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730233AbfBKPvZ (ORCPT ); Mon, 11 Feb 2019 10:51:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:47772 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731596AbfBKOiJ (ORCPT ); Mon, 11 Feb 2019 09:38:09 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 93DC02081B; Mon, 11 Feb 2019 14:38:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549895889; bh=isYRB4vcDV+9G1nICICJGjLx4sPd8oGv+q0tWbOF/uY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CET8iEKvuUuj3y4m6p6ynn0stXl2kY88md2XNQ2vuQvNtMZl/3YEJNA3omyZIZ3gy fRwH5hVt9ZyFJqOeLpTKcKHbFXk1OAkkM4E2N8mNet/EZhaOI9HSAveEUFwh1yJDkE DGXT4bc8S+Tbz5Fm5mAABaRlH4gBVFap/Pdoucx4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tony Luck , Borislav Petkov , "H. Peter Anvin" , Ingo Molnar , Thomas Gleixner , Vishal Verma , x86-ml Subject: [PATCH 4.20 345/352] x86/MCE: Initialize mce.bank in the case of a fatal error in mce_no_way_out() Date: Mon, 11 Feb 2019 15:19:32 +0100 Message-Id: <20190211141909.130188752@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211141846.543045703@linuxfoundation.org> References: <20190211141846.543045703@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tony Luck commit d28af26faa0b1daf3c692603d46bc4687c16f19e upstream. Internal injection testing crashed with a console log that said: mce: [Hardware Error]: CPU 7: Machine Check Exception: f Bank 0: bd80000000100134 This caused a lot of head scratching because the MCACOD (bits 15:0) of that status is a signature from an L1 data cache error. But Linux says that it found it in "Bank 0", which on this model CPU only reports L1 instruction cache errors. The answer was that Linux doesn't initialize "m->bank" in the case that it finds a fatal error in the mce_no_way_out() pre-scan of banks. If this was a local machine check, then this partially initialized struct mce is being passed to mce_panic(). Fix is simple: just initialize m->bank in the case of a fatal error. Fixes: 40c36e2741d7 ("x86/mce: Fix incorrect "Machine check from unknown source" message") Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Vishal Verma Cc: x86-ml Cc: stable@vger.kernel.org # v4.18 Note pre-v5.0 arch/x86/kernel/cpu/mce/core.c was called arch/x86/kernel/cpu/mcheck/mce.c Link: https://lkml.kernel.org/r/20190201003341.10638-1-tony.luck@intel.com Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/cpu/mcheck/mce.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -786,6 +786,7 @@ static int mce_no_way_out(struct mce *m, quirk_no_way_out(i, m, regs); if (mce_severity(m, mca_cfg.tolerant, &tmp, true) >= MCE_PANIC_SEVERITY) { + m->bank = i; mce_read_aux(m, i); *msg = tmp; return 1;