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=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 3C590C56201 for ; Mon, 9 Nov 2020 13:24:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DB21920663 for ; Mon, 9 Nov 2020 13:24:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604928251; bh=uueFz4NHq4UJJNizEaoVTQCqCi7fkiwkMdZ4QFb1lSs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zab6d0ZAtTAM0daLY9HxMPgd3N6Qumf3Zj3/YpA7u/LlkvTAma9Li7rYOKjGhBtvC 7dKscDJcXZT8rdwZolMT8k029bD++anWqXWPt8HzRkR4fXt67uR4CCXy1lqBZ8blpn ALRE/TXmVvUjaz+UFigNym1nQxGag+tqD7l7j59M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729958AbgKINTM (ORCPT ); Mon, 9 Nov 2020 08:19:12 -0500 Received: from mail.kernel.org ([198.145.29.99]:46510 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387689AbgKINTF (ORCPT ); Mon, 9 Nov 2020 08:19:05 -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 69D88206D8; Mon, 9 Nov 2020 13:19:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927944; bh=uueFz4NHq4UJJNizEaoVTQCqCi7fkiwkMdZ4QFb1lSs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XXfD3ix/PCqWgG6/eSu9oKOwVCPjNM9pGX7scwRCMDSrjEhylRVMYuor0ThgqOLJk BF1wLWndDjElRi12mdDKvEMIA06LvKfKIDRLuE1hlX1Go7MluAe6RjRQa3T3jy02ij Q+udaoy0Ilo1w/hSqeyoXV3QcEGZwoZQ5wym1pU8= 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 5.9 075/133] x86/kexec: Use up-to-dated screen_info copy to fill boot params Date: Mon, 9 Nov 2020 13:55:37 +0100 Message-Id: <20201109125034.339551520@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125030.706496283@linuxfoundation.org> References: <20201109125030.706496283@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: linux-kernel@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 57c2ecf431343..ce831f9448e71 100644 --- a/arch/x86/kernel/kexec-bzimage64.c +++ b/arch/x86/kernel/kexec-bzimage64.c @@ -200,8 +200,7 @@ 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