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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,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 05419C4360F for ; Thu, 4 Apr 2019 09:40:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C9198205F4 for ; Thu, 4 Apr 2019 09:40:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554370813; bh=2MZ483cMb+4bEeqB6KcWkEnGxQDFzhDXWOBz0isIen0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=BWwfeqUZJvw9T4Xw76lW8w+GNmX3BBGDTjhooG0/QzpOkwy3n1qs4X7Us46w/u9/6 lrkjOw6JgidAfOpU9oHEOcLQxmVs6Npp3kkQj/+ir7NTyAJ60I2lupN+pn8I9Fmbpv IYRKoMBFx/vuzU9lc6f9/jxMKBiBugZ0dToyLcK8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731886AbfDDJkM (ORCPT ); Thu, 4 Apr 2019 05:40:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:40578 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731134AbfDDJC7 (ORCPT ); Thu, 4 Apr 2019 05:02:59 -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 A32892177E; Thu, 4 Apr 2019 09:02:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554368579; bh=2MZ483cMb+4bEeqB6KcWkEnGxQDFzhDXWOBz0isIen0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kCX0r85dMwwyScwnO/B+N818d5Shs4Y65SgfCMJ5O1NuTBaxPD2onJMVKhfcb3RIX MHC7DqqHsiwQ4O0RtI6vziCU2QP/aBxKaJrcqvRJixzxisEwlZdMknOuN2ob7bQPrq RjVe3NxNbr1NPC+ajLeKvmWitqPJ87a99N0XrYjQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ross Lagerwall , Borislav Petkov , Tyler Baicar , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 4.19 075/187] efi: cper: Fix possible out-of-bounds access Date: Thu, 4 Apr 2019 10:46:52 +0200 Message-Id: <20190404084606.575600196@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190404084603.119654039@linuxfoundation.org> References: <20190404084603.119654039@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: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 45b14a4ffcc1e0b5caa246638f942cbe7eaea7ad ] When checking a generic status block, we iterate over all the generic data blocks. The loop condition only checks that the start of the generic data block is valid (within estatus->data_length) but not the whole block. Because the size of data blocks (excluding error data) may vary depending on the revision and the revision is contained within the data block, ensure that enough of the current data block is valid before dereferencing any members otherwise an out-of-bounds access may occur if estatus->data_length is invalid. This relies on the fact that struct acpi_hest_generic_data_v300 is a superset of the earlier version. Also rework the other checks to avoid potential underflow. Signed-off-by: Ross Lagerwall Acked-by: Borislav Petkov Tested-by: Tyler Baicar Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/firmware/efi/cper.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c index a7902fccdcfa..6090d25dce85 100644 --- a/drivers/firmware/efi/cper.c +++ b/drivers/firmware/efi/cper.c @@ -546,19 +546,24 @@ EXPORT_SYMBOL_GPL(cper_estatus_check_header); int cper_estatus_check(const struct acpi_hest_generic_status *estatus) { struct acpi_hest_generic_data *gdata; - unsigned int data_len, gedata_len; + unsigned int data_len, record_size; int rc; rc = cper_estatus_check_header(estatus); if (rc) return rc; + data_len = estatus->data_length; apei_estatus_for_each_section(estatus, gdata) { - gedata_len = acpi_hest_get_error_length(gdata); - if (gedata_len > data_len - acpi_hest_get_size(gdata)) + if (sizeof(struct acpi_hest_generic_data) > data_len) + return -EINVAL; + + record_size = acpi_hest_get_record_size(gdata); + if (record_size > data_len) return -EINVAL; - data_len -= acpi_hest_get_record_size(gdata); + + data_len -= record_size; } if (data_len) return -EINVAL; -- 2.19.1