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=-12.8 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,USER_AGENT_GIT autolearn=ham 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 4870AC4741F for ; Mon, 9 Nov 2020 13:10:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ECBC220867 for ; Mon, 9 Nov 2020 13:10:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927403; bh=1F4wsseaD7dA/55JAb7Imc6P+6gBNObou4dyyvIU1mA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QJqR8+cfh06kDSqeZ5ZPzIgC3RIOj7OXDHfD+sOMdxym5V1WN1fFxP4V998Y1u5OJ wzuPk/W6w4HQP7FsPFOcz4yBi/As05pCG9yty4ldPnR/LFgy0KOcRWvPT7lyZ7EB3z bwY8JR3Vy4Z9dcZB36S8q2zhkGnHrAGVbyNScGiI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730879AbgKINKC (ORCPT ); Mon, 9 Nov 2020 08:10:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:35090 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731963AbgKINKB (ORCPT ); Mon, 9 Nov 2020 08:10:01 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 D9C992083B; Mon, 9 Nov 2020 13:09:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927400; bh=1F4wsseaD7dA/55JAb7Imc6P+6gBNObou4dyyvIU1mA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xrCiOPOBTcph0Z6VdQ+Mtx73pnshA9GgLerCehkfcdA5AclNOQdjnnzz3cArL19lQ Qu61KOSulLnuMUJSFCOIdgKVD0WhFwXXXR4npoZPxgzSvNE3N7wdSuuWU5/7d7Kq8C COjURNu5qZrmTVRucpfBL2mRamQWqDotauBsVAho= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kairui Song , Ingo Molnar , Sasha Levin Subject: [PATCH 4.19 47/71] x86/kexec: Use up-to-dated screen_info copy to fill boot params Date: Mon, 9 Nov 2020 13:55:41 +0100 Message-Id: <20201109125022.110384129@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125019.906191744@linuxfoundation.org> References: <20201109125019.906191744@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kairui Song [ Upstream commit afc18069a2cb7ead5f86623a5f3d4ad6e21f940d ] kexec_file_load() currently reuses the old boot_params.screen_info, but if drivers have change the hardware state, boot_param.screen_info could contain invalid info. For example, the video type might be no longer VGA, or the frame buffer address might be changed. If the kexec kernel keeps using the old screen_info, kexec'ed kernel may attempt to write to an invalid framebuffer memory region. There are two screen_info instances globally available, boot_params.screen_info and screen_info. Later one is a copy, and is updated by drivers. So let kexec_file_load use the updated copy. [ mingo: Tidied up the changelog. ] Signed-off-by: Kairui Song Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20201014092429.1415040-2-kasong@redhat.com Signed-off-by: Sasha Levin --- arch/x86/kernel/kexec-bzimage64.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c index 9490a2845f14b..273687986a263 100644 --- a/arch/x86/kernel/kexec-bzimage64.c +++ b/arch/x86/kernel/kexec-bzimage64.c @@ -211,8 +211,7 @@ setup_boot_parameters(struct kimage *image, struct boot_params *params, params->hdr.hardware_subarch = boot_params.hdr.hardware_subarch; /* Copying screen_info will do? */ - memcpy(¶ms->screen_info, &boot_params.screen_info, - sizeof(struct screen_info)); + memcpy(¶ms->screen_info, &screen_info, sizeof(struct screen_info)); /* Fill in memsize later */ params->screen_info.ext_mem_k = 0; -- 2.27.0