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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,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 E97AFC2D0EA for ; Wed, 25 Mar 2020 19:44:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B79E020774 for ; Wed, 25 Mar 2020 19:44:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="GINL0q+2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727595AbgCYTn5 (ORCPT ); Wed, 25 Mar 2020 15:43:57 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:60598 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727376AbgCYTn4 (ORCPT ); Wed, 25 Mar 2020 15:43:56 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 02PJdAHT063141; Wed, 25 Mar 2020 19:43:38 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=0vH1KFZk1/4SVyE8Qk92sb7MjPD7nD4dOwBS6h2i5Ww=; b=GINL0q+274nAm3f93ervD4JaEUNE1EchEh6DCejGP5WHeWCqmMlw5YptLx1dxL8JLuy/ S47FZao/wNriO1uVlihVktb1XE57bvQlF3yPn5kqETNAn+RWKMXNjtxPTj2QqX8ZcfoS EzQsOsFvipm8mTzs2yk8sVJHTPM9zGhZm+O9gpIPW0yeY3mPw6hDeIX0S3nRV5L8gE3u Kh3xnhZ+UOGFMHdiclteE4lOoQmpUmLQ8UAmjd4APTbJtR3OpjBYbIvadisblj4udilR ROui00e3t542uIDxa53Bdm0XJ/vXPiX/TWZbBotS2+mGlvyepB+WsAVBUVZRoPbyMcEJ 8Q== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2120.oracle.com with ESMTP id 2ywavmbs8k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 25 Mar 2020 19:43:38 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 02PJgh5G188832; Wed, 25 Mar 2020 19:43:37 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 2yxw4s3php-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 25 Mar 2020 19:43:37 +0000 Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 02PJhakK024902; Wed, 25 Mar 2020 19:43:36 GMT Received: from pneuma.us.oracle.com (/10.39.203.246) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 25 Mar 2020 12:43:35 -0700 From: Ross Philipson To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-doc@vger.kernel.org Cc: ross.philipson@oracle.com, dpsmith@apertussolutions.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, trenchboot-devel@googlegroups.com Subject: [RFC PATCH 10/12] x86: Secure Launch adding event log securityfs Date: Wed, 25 Mar 2020 15:43:15 -0400 Message-Id: <20200325194317.526492-11-ross.philipson@oracle.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200325194317.526492-1-ross.philipson@oracle.com> References: <20200325194317.526492-1-ross.philipson@oracle.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9571 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 suspectscore=0 spamscore=0 mlxlogscore=999 adultscore=0 phishscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003250157 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9571 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 priorityscore=1501 mlxscore=0 bulkscore=0 clxscore=1015 impostorscore=0 phishscore=0 suspectscore=0 mlxlogscore=999 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003250156 Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org From: "Daniel P. Smith" The late init functionality registers securityfs nodes to allow fetching of and writing events to the late launch TPM log. Signed-off-by: Daniel P. Smith --- arch/x86/kernel/slaunch.c | 184 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 184 insertions(+) diff --git a/arch/x86/kernel/slaunch.c b/arch/x86/kernel/slaunch.c index 083fa72bd9f9..fea15b0e36b7 100644 --- a/arch/x86/kernel/slaunch.c +++ b/arch/x86/kernel/slaunch.c @@ -449,3 +449,187 @@ void __init slaunch_setup(void) vendor[3] == INTEL_CPUID_MFGID_EDX) slaunch_setup_intel(); } + +/* + * Securityfs exposure + */ +struct memfile { + char *name; + void __iomem *addr; + size_t size; +}; + +static struct memfile sl_evtlog = {"eventlog", 0, 0}; +static void __iomem *txt_heap; +static struct txt_heap_event_log_pointer2_1_element __iomem *evtlog20; + +static DEFINE_MUTEX(sl_evt_write_mutex); + +static ssize_t sl_evtlog_read(struct file *file, char __user *buf, + size_t count, loff_t *pos) +{ + return simple_read_from_buffer(buf, count, pos, + sl_evtlog.addr, sl_evtlog.size); +} + +static ssize_t sl_evtlog_write(struct file *file, const char __user *buf, + size_t datalen, loff_t *ppos) +{ + char *data; + ssize_t result; + + /* No partial writes. */ + result = -EINVAL; + if (*ppos != 0) + goto out; + + data = memdup_user(buf, datalen); + if (IS_ERR(data)) { + result = PTR_ERR(data); + goto out; + } + + mutex_lock(&sl_evt_write_mutex); + if (evtlog20) + result = tpm20_log_event(evtlog20, sl_evtlog.addr, + datalen, data); + else + result = tpm12_log_event(sl_evtlog.addr, datalen, data); + mutex_unlock(&sl_evt_write_mutex); + + kfree(data); +out: + return result; +} + +static const struct file_operations sl_evtlog_ops = { + .read = sl_evtlog_read, + .write = sl_evtlog_write, + .llseek = default_llseek, +}; + +#define SL_DIR_ENTRY 1 /* directoy node must be last */ +#define SL_FS_ENTRIES 2 + +static struct dentry *fs_entries[SL_FS_ENTRIES]; + +static long slaunch_expose_securityfs(void) +{ + long ret = 0; + int entry = SL_DIR_ENTRY; + + fs_entries[entry] = securityfs_create_dir("slaunch", NULL); + if (IS_ERR(fs_entries[entry])) { + pr_err("Error creating securityfs sl_evt_log directory\n"); + ret = PTR_ERR(fs_entries[entry]); + goto err; + } + + if (sl_evtlog.addr > 0) { + entry--; + fs_entries[entry] = securityfs_create_file(sl_evtlog.name, + S_IRUSR | S_IRGRP, + fs_entries[SL_DIR_ENTRY], NULL, + &sl_evtlog_ops); + if (IS_ERR(fs_entries[entry])) { + pr_err("Error creating securityfs %s file\n", + sl_evtlog.name); + ret = PTR_ERR(fs_entries[entry]); + goto err_dir; + } + } + + return 0; + +err_dir: + securityfs_remove(fs_entries[SL_DIR_ENTRY]); +err: + return ret; +} + +static void slaunch_teardown_securityfs(void) +{ + int i; + + for (i = 0; i < SL_FS_ENTRIES; i++) + securityfs_remove(fs_entries[i]); + + if (sl_flags & SL_FLAG_ARCH_TXT) { + if (txt_heap) { + memunmap(txt_heap); + txt_heap = NULL; + } + } + + sl_evtlog.addr = 0; + sl_evtlog.size = 0; +} + +static void slaunch_intel_evtlog(void) +{ + void __iomem *config; + struct txt_os_mle_data *params; + void *os_sinit_data; + u64 base, size; + + config = ioremap(TXT_PUB_CONFIG_REGS_BASE, TXT_NR_CONFIG_PAGES * + PAGE_SIZE); + if (!config) { + pr_err("Error failed to ioremap TXT reqs\n"); + return; + } + + memcpy_fromio(&base, config + TXT_CR_HEAP_BASE, sizeof(u64)); + memcpy_fromio(&size, config + TXT_CR_HEAP_SIZE, sizeof(u64)); + iounmap(config); + + /* now map TXT heap */ + txt_heap = memremap(base, size, MEMREMAP_WB); + if (!txt_heap) { + pr_err("Error failed to memremap TXT heap\n"); + return; + } + + params = (struct txt_os_mle_data *)txt_os_mle_data_start(txt_heap); + + sl_evtlog.size = TXT_MAX_EVENT_LOG_SIZE; + sl_evtlog.addr = (void __iomem *)¶ms->event_log_buffer[0]; + + /* Determine if this is TPM 1.2 or 2.0 event log */ + if (memcmp(sl_evtlog.addr + sizeof(struct tpm12_pcr_event), + TPM20_EVTLOG_SIGNATURE, sizeof(TPM20_EVTLOG_SIGNATURE))) + return; /* looks like it is not 2.0 */ + + /* For TPM 2.0 logs, the extended heap element must be located */ + os_sinit_data = txt_os_sinit_data_start(txt_heap); + + evtlog20 = tpm20_find_log2_1_element(os_sinit_data); + + /* + * If this fails, things are in really bad shape. Any attempt to write + * events to the log will fail. + */ + if (!evtlog20) + pr_err("Error failed to find TPM20 event log element\n"); +} + +static int __init slaunch_late_init(void) +{ + /* Check to see if Secure Launch happened */ + if (!(sl_flags & (SL_FLAG_ACTIVE|SL_FLAG_ARCH_TXT))) + return 0; + + /* Only Intel TXT is supported at this point */ + slaunch_intel_evtlog(); + + return slaunch_expose_securityfs(); +} + +static void __exit slaunch_exit(void) +{ + slaunch_teardown_securityfs(); +} + +late_initcall(slaunch_late_init); + +__exitcall(slaunch_exit); -- 2.25.1