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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,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 EE107C433EB for ; Mon, 20 Jul 2020 15:44:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C0B9F20773 for ; Mon, 20 Jul 2020 15:44:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595259855; bh=P2ysq1NxrLaFk1X+my8dkrWsgOs67+ruXrr9CBrYbDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=nIo2ObQLTjySl+6Bn2DGKVJ93sCsjLnDaJCGgkmPAznw1mjXesoWRyrpEXVf3xkwJ +6TI8mydOwvn461ZfoYlXLLgWkPOCPgRr+cSzsScTN5ig7ENwv8rewUOAdgdCY/R0S nU3G4N4SWTpYxW2QWkpWqnflqzoxuxOEyJFni6wE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726046AbgGTPoO (ORCPT ); Mon, 20 Jul 2020 11:44:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:37928 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730365AbgGTPoK (ORCPT ); Mon, 20 Jul 2020 11:44:10 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 D01742064B; Mon, 20 Jul 2020 15:44:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595259850; bh=P2ysq1NxrLaFk1X+my8dkrWsgOs67+ruXrr9CBrYbDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RVtSu0PRIMwqd93+FRyxGO5smh0NjPHIYiaPYJj2j9cHDdxEWGdrlmUP3HcI0wiIs wqpUoAIWmeQ85Gt/8c0QhPSkdzNRbpwrjHLsVTnqzLSIysxWE1UUJ4zz3jaMzGiBxU 9u15pRAG3MQQRRb/Z7qSAa9evMk3LEW77yzb9JCA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andy Lutomirski , Marco Elver , "Peter Zijlstra (Intel)" , Lai Jiangshan , Sasha Levin Subject: [PATCH 4.14 016/125] x86/entry: Increase entry_stack size to a full page Date: Mon, 20 Jul 2020 17:35:55 +0200 Message-Id: <20200720152803.767781285@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200720152802.929969555@linuxfoundation.org> References: <20200720152802.929969555@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peter Zijlstra [ Upstream commit c7aadc09321d8f9a1d3bd1e6d8a47222ecddf6c5 ] Marco crashed in bad_iret with a Clang11/KCSAN build due to overflowing the stack. Now that we run C code on it, expand it to a full page. Suggested-by: Andy Lutomirski Reported-by: Marco Elver Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Lai Jiangshan Tested-by: Marco Elver Link: https://lkml.kernel.org/r/20200618144801.819246178@infradead.org Signed-off-by: Sasha Levin --- arch/x86/include/asm/processor.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 6a87eda9691e4..56a89519dc144 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -344,7 +344,7 @@ struct x86_hw_tss { #define INVALID_IO_BITMAP_OFFSET 0x8000 struct entry_stack { - unsigned long words[64]; + char stack[PAGE_SIZE]; }; struct entry_stack_page { -- 2.25.1