From patchwork Thu Sep 15 11:26:05 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mimi Zohar X-Patchwork-Id: 9333155 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 17E1B6077F for ; Thu, 15 Sep 2016 11:26:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 08B3F295C4 for ; Thu, 15 Sep 2016 11:26:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F14AC295C6; Thu, 15 Sep 2016 11:26:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.4 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 39D3F295C7 for ; Thu, 15 Sep 2016 11:26:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933159AbcIOL0m (ORCPT ); Thu, 15 Sep 2016 07:26:42 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:38528 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1765989AbcIOL0j (ORCPT ); Thu, 15 Sep 2016 07:26:39 -0400 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u8FBNLmT002112 for ; Thu, 15 Sep 2016 07:26:39 -0400 Received: from e23smtp04.au.ibm.com (e23smtp04.au.ibm.com [202.81.31.146]) by mx0a-001b2d01.pphosted.com with ESMTP id 25f1nrs2x1-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 15 Sep 2016 07:26:39 -0400 Received: from localhost by e23smtp04.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 15 Sep 2016 21:26:33 +1000 X-IBM-Helo: d23dlp02.au.ibm.com X-IBM-MailFrom: zohar@linux.vnet.ibm.com X-IBM-RcptTo: linux-kernel@vger.kernel.org; linux-security-module@vger.kernel.org Received: from d23relay08.au.ibm.com (d23relay08.au.ibm.com [9.185.71.33]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id 412F92BB005A; Thu, 15 Sep 2016 21:26:33 +1000 (EST) Received: from d23av06.au.ibm.com (d23av06.au.ibm.com [9.190.235.151]) by d23relay08.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u8FBQXMN65142814; Thu, 15 Sep 2016 21:26:33 +1000 Received: from d23av06.au.ibm.com (localhost [127.0.0.1]) by d23av06.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u8FBQWFb008194; Thu, 15 Sep 2016 21:26:33 +1000 Received: from localhost.localdomain.localdomain ([9.80.88.56]) by d23av06.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id u8FBQIJt007907; Thu, 15 Sep 2016 21:26:29 +1000 From: Mimi Zohar To: linux-security-module Cc: "Eric W. Biederman" , Mimi Zohar , linux-ima-devel@lists.sourceforge.net, Dave Young , kexec@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Thiago Jung Bauermann , Andrew Morton Subject: [PATCH v4 3/9] ima: maintain memory size needed for serializing the measurement list Date: Thu, 15 Sep 2016 07:26:05 -0400 X-Mailer: git-send-email 2.1.0 In-Reply-To: <1473938771-2782-1-git-send-email-zohar@linux.vnet.ibm.com> References: <1473938771-2782-1-git-send-email-zohar@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16091511-0012-0000-0000-000001C7BB45 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16091511-0013-0000-0000-00000601F16E Message-Id: <1473938771-2782-4-git-send-email-zohar@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-09-15_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609020000 definitions=main-1609150154 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP In preparation for serializing the binary_runtime_measurements, this patch maintains the amount of memory required. Changelog v3: - include the ima_kexec_hdr size in the binary_runtime_measurement size. Signed-off-by: Mimi Zohar --- security/integrity/ima/Kconfig | 12 +++++++++ security/integrity/ima/ima.h | 1 + security/integrity/ima/ima_queue.c | 53 ++++++++++++++++++++++++++++++++++++-- 3 files changed, 64 insertions(+), 2 deletions(-) diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig index 5487827..1c5a1c2 100644 --- a/security/integrity/ima/Kconfig +++ b/security/integrity/ima/Kconfig @@ -27,6 +27,18 @@ config IMA to learn more about IMA. If unsure, say N. +config IMA_KEXEC + bool "Enable carrying the IMA measurement list across a soft boot" + depends on IMA && TCG_TPM && KEXEC_FILE + default n + help + TPM PCRs are only reset on a hard reboot. In order to validate + a TPM's quote after a soft boot, the IMA measurement list of the + running kernel must be saved and restored on boot. + + Depending on the IMA policy, the measurement list can grow to + be very large. + config IMA_MEASURE_PCR_IDX int depends on IMA diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index e7b3755..f9cd08e 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -133,6 +133,7 @@ void ima_print_digest(struct seq_file *m, u8 *digest, u32 size); struct ima_template_desc *ima_template_desc_current(void); int ima_restore_measurement_entry(struct ima_template_entry *entry); int ima_restore_measurement_list(loff_t bufsize, void *buf); +unsigned long ima_get_binary_runtime_size(void); int ima_init_template(void); #ifdef CONFIG_KEXEC_FILE diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index 12d1b04..3a3cc2a 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -29,6 +29,11 @@ #define AUDIT_CAUSE_LEN_MAX 32 LIST_HEAD(ima_measurements); /* list of all measurements */ +#ifdef CONFIG_IMA_KEXEC +static unsigned long binary_runtime_size; +#else +static unsigned long binary_runtime_size = ULONG_MAX; +#endif /* key: inode (before secure-hashing a file) */ struct ima_h_table ima_htable = { @@ -64,6 +69,24 @@ static struct ima_queue_entry *ima_lookup_digest_entry(u8 *digest_value, return ret; } +/* + * Calculate the memory required for serializing a single + * binary_runtime_measurement list entry, which contains a + * couple of variable length fields (e.g template name and data). + */ +static int get_binary_runtime_size(struct ima_template_entry *entry) +{ + int size = 0; + + size += sizeof(u32); /* pcr */ + size += sizeof(entry->digest); + size += sizeof(int); /* template name size field */ + size += strlen(entry->template_desc->name); + size += sizeof(entry->template_data_len); + size += entry->template_data_len; + return size; +} + /* ima_add_template_entry helper function: * - Add template entry to the measurement list and hash table, for * all entries except those carried across kexec. @@ -90,9 +113,30 @@ static int ima_add_digest_entry(struct ima_template_entry *entry, int flags) key = ima_hash_key(entry->digest); hlist_add_head_rcu(&qe->hnext, &ima_htable.queue[key]); } + + if (binary_runtime_size != ULONG_MAX) { + int size; + + size = get_binary_runtime_size(entry); + binary_runtime_size = (binary_runtime_size < ULONG_MAX - size) ? + binary_runtime_size + size : ULONG_MAX; + } return 0; } +/* + * Return the amount of memory required for serializing the + * entire binary_runtime_measurement list, including the ima_kexec_hdr + * structure. + */ +unsigned long ima_get_binary_runtime_size(void) +{ + if (binary_runtime_size >= (ULONG_MAX - sizeof(struct ima_kexec_hdr))) + return ULONG_MAX; + else + return binary_runtime_size + sizeof(struct ima_kexec_hdr); +}; + static int ima_pcr_extend(const u8 *hash, int pcr) { int result = 0; @@ -106,8 +150,13 @@ static int ima_pcr_extend(const u8 *hash, int pcr) return result; } -/* Add template entry to the measurement list and hash table, - * and extend the pcr. +/* + * Add template entry to the measurement list and hash table, and + * extend the pcr. + * + * On systems which support carrying the IMA measurement list across + * kexec, maintain the total memory size required for serializing the + * binary_runtime_measurements. */ int ima_add_template_entry(struct ima_template_entry *entry, int violation, const char *op, struct inode *inode,