From patchwork Sat Jan 30 00:45:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tushar Sugandhi X-Patchwork-Id: 12056685 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=-26.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL 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 1DC1BC433E0 for ; Sat, 30 Jan 2021 00:54:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A483464E00 for ; Sat, 30 Jan 2021 00:54:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232665AbhA3Awk (ORCPT ); Fri, 29 Jan 2021 19:52:40 -0500 Received: from linux.microsoft.com ([13.77.154.182]:58326 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232709AbhA3Aro (ORCPT ); Fri, 29 Jan 2021 19:47:44 -0500 Received: from tusharsu-Ubuntu.lan (c-71-197-163-6.hsd1.wa.comcast.net [71.197.163.6]) by linux.microsoft.com (Postfix) with ESMTPSA id 7588820B6C42; Fri, 29 Jan 2021 16:45:29 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 7588820B6C42 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1611967530; bh=xbUSoVcgOIGV7nfEfL10khfV1qEza6GJY81X5AvCiwY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ILnocgY7vnbLuWCwn0yo3qf+tvgh4ErmEk3bVs5Pjb1+zOR41okvFUPXNjGYqPJVT ilWm5N+SZQCFVVU4cbDLD705tpEdAcFNuWtcBBm1nNM/fiJn2BRy2zw3VwiGsoQG6+ VjGeJN4LX1xkHjx630eRjaGGeVKLuHaPk0qkxnWU= From: Tushar Sugandhi To: zohar@linux.ibm.com, stephen.smalley.work@gmail.com, casey@schaufler-ca.com, agk@redhat.com, snitzer@redhat.com, gmazyland@gmail.com, paul@paul-moore.com Cc: tyhicks@linux.microsoft.com, sashal@kernel.org, jmorris@namei.org, nramas@linux.microsoft.com, linux-integrity@vger.kernel.org, selinux@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, dm-devel@redhat.com Subject: [PATCH 3/3] IMA: add support to measure duplicate buffer for critical data hook Date: Fri, 29 Jan 2021 16:45:19 -0800 Message-Id: <20210130004519.25106-4-tusharsu@linux.microsoft.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210130004519.25106-1-tusharsu@linux.microsoft.com> References: <20210130004519.25106-1-tusharsu@linux.microsoft.com> Precedence: bulk List-ID: process_buffer_measurement() and the underlying functions do not use the policy condition to measure duplicate buffer entries for integrity critical data. Update process_buffer_measurement(), ima_add_template_entry(), and ima_store_template() to use the policy condition to decide if a duplicate buffer entry for integrity critical data should be measured. Signed-off-by: Tushar Sugandhi --- security/integrity/ima/ima.h | 4 ++-- security/integrity/ima/ima_api.c | 9 +++++---- security/integrity/ima/ima_init.c | 2 +- security/integrity/ima/ima_main.c | 5 +++-- security/integrity/ima/ima_queue.c | 5 +++-- 5 files changed, 14 insertions(+), 11 deletions(-) diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 59324173497f..b06732560949 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -139,7 +139,7 @@ int ima_init(void); int ima_fs_init(void); int ima_add_template_entry(struct ima_template_entry *entry, int violation, const char *op, struct inode *inode, - const unsigned char *filename); + const unsigned char *filename, bool allow_dup); int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash); int ima_calc_buffer_hash(const void *buf, loff_t len, struct ima_digest_data *hash); @@ -278,7 +278,7 @@ int ima_alloc_init_template(struct ima_event_data *event_data, struct ima_template_desc *template_desc); int ima_store_template(struct ima_template_entry *entry, int violation, struct inode *inode, - const unsigned char *filename, int pcr); + const unsigned char *filename, int pcr, bool allow_dup); void ima_free_template_entry(struct ima_template_entry *entry); const char *ima_d_path(const struct path *path, char **pathbuf, char *filename); diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index d273373e6be9..f84369f9905e 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -101,7 +101,7 @@ int ima_alloc_init_template(struct ima_event_data *event_data, */ int ima_store_template(struct ima_template_entry *entry, int violation, struct inode *inode, - const unsigned char *filename, int pcr) + const unsigned char *filename, int pcr, bool allow_dup) { static const char op[] = "add_template_measure"; static const char audit_cause[] = "hashing_error"; @@ -119,7 +119,8 @@ int ima_store_template(struct ima_template_entry *entry, } } entry->pcr = pcr; - result = ima_add_template_entry(entry, violation, op, inode, filename); + result = ima_add_template_entry(entry, violation, op, inode, filename, + allow_dup); return result; } @@ -152,7 +153,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename, goto err_out; } result = ima_store_template(entry, violation, inode, - filename, CONFIG_IMA_MEASURE_PCR_IDX); + filename, CONFIG_IMA_MEASURE_PCR_IDX, false); if (result < 0) ima_free_template_entry(entry); err_out: @@ -330,7 +331,7 @@ void ima_store_measurement(struct integrity_iint_cache *iint, return; } - result = ima_store_template(entry, violation, inode, filename, pcr); + result = ima_store_template(entry, violation, inode, filename, pcr, false); if ((!result || result == -EEXIST) && !(file->f_flags & O_DIRECT)) { iint->flags |= IMA_MEASURED; iint->measured_pcrs |= (0x1 << pcr); diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index 6e8742916d1d..d0a79d7b8d89 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -88,7 +88,7 @@ static int __init ima_add_boot_aggregate(void) result = ima_store_template(entry, violation, NULL, boot_aggregate_name, - CONFIG_IMA_MEASURE_PCR_IDX); + CONFIG_IMA_MEASURE_PCR_IDX, false); if (result < 0) { ima_free_template_entry(entry); audit_cause = "store_entry"; diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 2774139845b6..ff6d15d7594c 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -843,6 +843,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, int digest_hash_len = hash_digest_size[ima_hash_algo]; int violation = 0; int action = 0; + bool allow_dup = false; u32 secid; if (!ima_policy_flag) @@ -865,7 +866,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, if (func) { security_task_getsecid(current, &secid); action = ima_get_action(inode, current_cred(), secid, 0, func, - &pcr, &template, func_data, NULL); + &pcr, &template, func_data, &allow_dup); if (!(action & IMA_MEASURE)) return; } @@ -903,7 +904,7 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size, goto out; } - ret = ima_store_template(entry, violation, NULL, event_data.buf, pcr); + ret = ima_store_template(entry, violation, NULL, event_data.buf, pcr, allow_dup); if (ret < 0) { audit_cause = "store_entry"; ima_free_template_entry(entry); diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index c096ef8945c7..fbf359495fa8 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -158,7 +158,7 @@ static int ima_pcr_extend(struct tpm_digest *digests_arg, int pcr) */ int ima_add_template_entry(struct ima_template_entry *entry, int violation, const char *op, struct inode *inode, - const unsigned char *filename) + const unsigned char *filename, bool allow_dup) { u8 *digest = entry->digests[ima_hash_algo_idx].digest; struct tpm_digest *digests_arg = entry->digests; @@ -169,7 +169,8 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation, mutex_lock(&ima_extend_list_mutex); if (!violation) { - if (ima_lookup_digest_entry(digest, entry->pcr)) { + if (!allow_dup && + ima_lookup_digest_entry(digest, entry->pcr)) { audit_cause = "hash_exists"; result = -EEXIST; goto out;