From patchwork Thu Apr 2 22:51:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 11471681 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 E0B9F17EA for ; Thu, 2 Apr 2020 22:51:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C9A2C2078C for ; Thu, 2 Apr 2020 22:51:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390129AbgDBWvw (ORCPT ); Thu, 2 Apr 2020 18:51:52 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:48070 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2387919AbgDBWvv (ORCPT ); Thu, 2 Apr 2020 18:51:51 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 032MWWBM055450; Thu, 2 Apr 2020 18:51:43 -0400 Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0b-001b2d01.pphosted.com with ESMTP id 304gstv9jj-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 (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id 032MoZfK018464; 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 ppma03dal.us.ibm.com with ESMTP id 301x787df2-1 (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 032MpfGF46530938 (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 7DE45283F3; 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 650A0283FB; 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 2/2] tpm: Add support for event log pointer found in TPM2 ACPI table Date: Thu, 2 Apr 2020 18:51:40 -0400 Message-Id: <20200402225140.922789-3-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 impostorscore=0 spamscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 phishscore=0 clxscore=1015 mlxlogscore=999 mlxscore=0 adultscore=0 bulkscore=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 In case a TPM2 is attached, search for a TPM2 ACPI table when trying to get the event log from ACPI. If one is found, use it to get the start and length of the log area. This allows non-UEFI systems, such as SeaBIOS, to pass an event log when using a TPM2. Signed-off-by: Stefan Berger --- drivers/char/tpm/eventlog/acpi.c | 56 +++++++++++++++++++++++++--------------- 1 file changed, 35 insertions(+), 21 deletions(-) diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c index 63ada5e53f13..e714a2bd0423 100644 --- a/drivers/char/tpm/eventlog/acpi.c +++ b/drivers/char/tpm/eventlog/acpi.c @@ -49,9 +49,8 @@ int tpm_read_log_acpi(struct tpm_chip *chip) void __iomem *virt; u64 len, start; struct tpm_bios_log *log; - - if (chip->flags & TPM_CHIP_FLAG_TPM2) - return -ENODEV; + struct acpi_table_tpm2 *tbl; + int format; log = &chip->log; @@ -61,23 +60,38 @@ int tpm_read_log_acpi(struct tpm_chip *chip) if (!chip->acpi_dev_handle) return -ENODEV; - /* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */ - status = acpi_get_table(ACPI_SIG_TCPA, 1, - (struct acpi_table_header **)&buff); - - if (ACPI_FAILURE(status)) - return -ENODEV; - - switch(buff->platform_class) { - case BIOS_SERVER: - len = buff->server.log_max_len; - start = buff->server.log_start_addr; - break; - case BIOS_CLIENT: - default: - len = buff->client.log_max_len; - start = buff->client.log_start_addr; - break; + if (chip->flags & TPM_CHIP_FLAG_TPM2) { + status = acpi_get_table("TPM2", 1, + (struct acpi_table_header **)&tbl); + if (ACPI_FAILURE(status)) + return -ENODEV; + if (tbl->header.length < sizeof(*tbl)) + return -ENODEV; + len = tbl->log_area_minimum_length; + start = tbl->log_area_start_address; + if (!start || !len) + return -ENODEV; + format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2; + } else { + /* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */ + status = acpi_get_table(ACPI_SIG_TCPA, 1, + (struct acpi_table_header **)&buff); + + if (ACPI_FAILURE(status)) + return -ENODEV; + + switch (buff->platform_class) { + case BIOS_SERVER: + len = buff->server.log_max_len; + start = buff->server.log_start_addr; + break; + case BIOS_CLIENT: + default: + len = buff->client.log_max_len; + start = buff->client.log_start_addr; + break; + } + format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2; } if (!len) { dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__); @@ -98,7 +112,7 @@ int tpm_read_log_acpi(struct tpm_chip *chip) memcpy_fromio(log->bios_event_log, virt, len); acpi_os_unmap_iomem(virt, len); - return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2; + return format; err: kfree(log->bios_event_log);