From patchwork Fri Jun 25 16:56:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12345665 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 1C9EEC49EB7 for ; Fri, 25 Jun 2021 16:59:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 02E556193F for ; Fri, 25 Jun 2021 16:59:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230252AbhFYRBm (ORCPT ); Fri, 25 Jun 2021 13:01:42 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]:3318 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230094AbhFYRBl (ORCPT ); Fri, 25 Jun 2021 13:01:41 -0400 Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4GBND91GHlz6L52F; Sat, 26 Jun 2021 00:45:45 +0800 (CST) Received: from roberto-ThinkStation-P620.huawei.com (10.204.63.22) by fraeml714-chm.china.huawei.com (10.206.15.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Fri, 25 Jun 2021 18:59:18 +0200 From: Roberto Sassu To: CC: , , , , , Roberto Sassu Subject: [RFC][PATCH 11/12] digest_lists: Interfaces - digests_count Date: Fri, 25 Jun 2021 18:56:13 +0200 Message-ID: <20210625165614.2284243-12-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210625165614.2284243-1-roberto.sassu@huawei.com> References: <20210625165614.2284243-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml751-chm.china.huawei.com (10.201.108.201) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: This patch introduces the digests_count interface, which shows the current number of digests stored in the hash table by type. Signed-off-by: Roberto Sassu --- Documentation/security/digest_lists.rst | 7 +++++ security/integrity/digest_lists/fs.c | 35 +++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/Documentation/security/digest_lists.rst b/Documentation/security/digest_lists.rst index f3900a6e92f6..25b5665bbeaa 100644 --- a/Documentation/security/digest_lists.rst +++ b/Documentation/security/digest_lists.rst @@ -697,3 +697,10 @@ digest list (buffer) loaded ``through digest_list_add``. ``digest_query``: allows to write a query in the format ``-`` and to obtain all digest lists that include that digest. + + +``digests_count`` +~~~~~~~~~~~~~~~~~ + +``digests_count`` shows the current number of digests stored in the hash +table by type. diff --git a/security/integrity/digest_lists/fs.c b/security/integrity/digest_lists/fs.c index bdfeb8797760..37091db50df5 100644 --- a/security/integrity/digest_lists/fs.c +++ b/security/integrity/digest_lists/fs.c @@ -37,6 +37,7 @@ static struct dentry *digest_lists_dir; static struct dentry *digest_lists_loaded_dir; +static struct dentry *digests_count; static struct dentry *digest_label_dentry; static struct dentry *digest_query_dentry; static struct dentry *digest_list_add_dentry; @@ -44,6 +45,33 @@ static struct dentry *digest_list_del_dentry; char digest_query[CRYPTO_MAX_ALG_NAME + 1 + IMA_MAX_DIGEST_SIZE * 2 + 1]; char digest_label[NAME_MAX + 1]; +static char *types_str[COMPACT__LAST] = { + [COMPACT_PARSER] = "Parser", + [COMPACT_FILE] = "File", + [COMPACT_METADATA] = "Metadata", + [COMPACT_DIGEST_LIST] = "Digest list", +}; + +static ssize_t digest_lists_show_htable_len(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + char tmpbuf[1024]; + ssize_t len = 0; + int i; + + for (i = COMPACT_PARSER; i < COMPACT__LAST; i++) + len += scnprintf(tmpbuf + len, sizeof(tmpbuf) - len, + "%s digests: %li\n", types_str[i], + atomic_long_read(&htable[i].len)); + + return simple_read_from_buffer(buf, count, ppos, tmpbuf, len); +} + +static const struct file_operations htable_len_ops = { + .read = digest_lists_show_htable_len, + .llseek = generic_file_llseek, +}; + static int parse_digest_list_filename(const char *digest_list_filename, u8 *digest, enum hash_algo *algo) { @@ -646,6 +674,12 @@ static int __init digest_lists_fs_init(void) if (IS_ERR(digest_lists_loaded_dir)) goto out; + digests_count = securityfs_create_file("digests_count", 0440, + digest_lists_dir, NULL, + &htable_len_ops); + if (IS_ERR(digests_count)) + goto out; + digest_list_add_dentry = securityfs_create_file("digest_list_add", 0200, digest_lists_dir, NULL, &digest_list_upload_ops); @@ -676,6 +710,7 @@ static int __init digest_lists_fs_init(void) securityfs_remove(digest_label_dentry); securityfs_remove(digest_list_del_dentry); securityfs_remove(digest_list_add_dentry); + securityfs_remove(digests_count); securityfs_remove(digest_lists_loaded_dir); securityfs_remove(digest_lists_dir); return -1;