From patchwork Thu Apr 2 22:51:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 11471675 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 21A44159A for ; Thu, 2 Apr 2020 22:51:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0A8DE2082F for ; Thu, 2 Apr 2020 22:51:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390105AbgDBWvs (ORCPT ); Thu, 2 Apr 2020 18:51:48 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:16776 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2387919AbgDBWvq (ORCPT ); Thu, 2 Apr 2020 18:51:46 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 032MXUQv105298; Thu, 2 Apr 2020 18:51:43 -0400 Received: from ppma01dal.us.ibm.com (83.d6.3fa9.ip4.static.sl-reverse.com [169.63.214.131]) by mx0b-001b2d01.pphosted.com with ESMTP id 302071ybm2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 02 Apr 2020 18:51:43 -0400 Received: from pps.filterd (ppma01dal.us.ibm.com [127.0.0.1]) by ppma01dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id 032Mov0G003921; Thu, 2 Apr 2020 22:51:42 GMT Received: from b01cxnp23032.gho.pok.ibm.com (b01cxnp23032.gho.pok.ibm.com [9.57.198.27]) by ppma01dal.us.ibm.com with ESMTP id 301x77yd6e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 02 Apr 2020 22:51:42 +0000 Received: from b01ledav001.gho.pok.ibm.com (b01ledav001.gho.pok.ibm.com [9.57.199.106]) by b01cxnp23032.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 032MpfvT53150190 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 2 Apr 2020 22:51:41 GMT Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 61A19283FA; Thu, 2 Apr 2020 22:51:41 +0000 (GMT) Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 52673283F9; Thu, 2 Apr 2020 22:51:41 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav001.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 2 Apr 2020 22:51:41 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org, jarkko.sakkinen@linux.intel.com, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-security-module@vger.kernel.org Cc: Stefan Berger Subject: [PATCH v4 1/2] acpi: Extend TPM2 ACPI table with missing log fields Date: Thu, 2 Apr 2020 18:51:39 -0400 Message-Id: <20200402225140.922789-2-stefanb@linux.vnet.ibm.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200402225140.922789-1-stefanb@linux.vnet.ibm.com> References: <20200402225140.922789-1-stefanb@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.676 definitions=2020-04-02_12:2020-04-02,2020-04-02 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 spamscore=0 lowpriorityscore=0 adultscore=0 mlxlogscore=999 suspectscore=0 bulkscore=0 phishscore=0 priorityscore=1501 mlxscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004020164 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: From: Stefan Berger Recent extensions of the TPM2 ACPI table added 3 more fields including 12 bytes of start method specific parameters and Log Area Minimum Length (u32) and Log Area Start Address (u64). So, we extend the existing structure with these fields to allow non-UEFI systems to access the TPM2's log. The specification that has the new fields is the following: TCG ACPI Specification Family "1.2" and "2.0" Version 1.2, Revision 8 Adapt all existing table size calculations to use offsetof(struct acpi_table_tpm2, start_method_specific) [where start_method_specific is a newly added field] rather than sizeof(struct acpi_table_tpm2) so that the addition of the new fields does not affect current systems that may not have them. Signed-off-by: Stefan Berger Cc: linux-acpi@vger.kernel.org --- drivers/char/tpm/tpm_crb.c | 13 ++++++++++--- drivers/char/tpm/tpm_tis.c | 4 +++- include/acpi/actbl3.h | 5 +++-- 3 files changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index a9dcf31eadd2..0565aa5482f9 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -669,7 +669,9 @@ static int crb_acpi_add(struct acpi_device *device) status = acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **) &buf); - if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) { + if (ACPI_FAILURE(status) || buf->header.length < + offsetof(struct acpi_table_tpm2, + start_method_specific)) { dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n"); return -EINVAL; } @@ -684,14 +686,19 @@ static int crb_acpi_add(struct acpi_device *device) return -ENOMEM; if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) { - if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) { + if (buf->header.length < + (offsetof(struct acpi_table_tpm2, + start_method_specific) + + sizeof(*crb_smc))) { dev_err(dev, FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n", buf->header.length, ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC); return -EINVAL; } - crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf)); + crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, + offsetof(struct acpi_table_tpm2, + start_method_specific)); priv->smc_func_id = crb_smc->smc_func_id; } diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index e7df342a317d..a80f36860bac 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -111,7 +111,9 @@ static int check_acpi_tpm2(struct device *dev) */ st = acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl); - if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) { + if (ACPI_FAILURE(st) || tbl->header.length < + offsetof(struct acpi_table_tpm2, + start_method_specific)) { dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n"); return -EINVAL; } diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h index 2bf3baf819bb..b6118c67af0c 100644 --- a/include/acpi/actbl3.h +++ b/include/acpi/actbl3.h @@ -411,8 +411,9 @@ struct acpi_table_tpm2 { u16 reserved; u64 control_address; u32 start_method; - - /* Platform-specific data follows */ + u8 start_method_specific[12]; + u32 log_area_minimum_length; /* optional */ + u64 log_area_start_address; /* optional */ }; /* Values for start_method above */