From patchwork Tue Sep 14 16:33:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12494241 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=ham 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 C37CEC43219 for ; Tue, 14 Sep 2021 16:35:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ADA736112E for ; Tue, 14 Sep 2021 16:35:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230523AbhINQhH (ORCPT ); Tue, 14 Sep 2021 12:37:07 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]:3803 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229931AbhINQg6 (ORCPT ); Tue, 14 Sep 2021 12:36:58 -0400 Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4H886f5F28z67x8s; Wed, 15 Sep 2021 00:33:30 +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 15.1.2308.8; Tue, 14 Sep 2021 18:35:39 +0200 From: Roberto Sassu To: , , CC: , , , , , Roberto Sassu Subject: [PATCH v3 09/13] diglim: Interfaces - digest_list_label Date: Tue, 14 Sep 2021 18:33:57 +0200 Message-ID: <20210914163401.864635-10-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210914163401.864635-1-roberto.sassu@huawei.com> References: <20210914163401.864635-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml754-chm.china.huawei.com (10.201.108.204) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Introduce the digest_list_label interface. It can be used to set a label to be applied to the next digest list (buffer) loaded through digest_list_add. Signed-off-by: Roberto Sassu --- security/integrity/diglim/fs.c | 48 ++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/security/integrity/diglim/fs.c b/security/integrity/diglim/fs.c index 4913c1df2918..deeb04f3c42c 100644 --- a/security/integrity/diglim/fs.c +++ b/security/integrity/diglim/fs.c @@ -37,6 +37,13 @@ static struct dentry *diglim_dir; * removed. */ static struct dentry *digest_lists_loaded_dir; +/** + * DOC: digest_list_label + * + * digest_list_label can be used to set a label to be applied to the next digest + * list (buffer) loaded through digest_list_add. + */ +static struct dentry *digest_list_label_dentry; /** * DOC: digest_list_add * @@ -553,6 +560,40 @@ static const struct file_operations digest_list_upload_ops = { .llseek = generic_file_llseek, }; +/* + * digest_list_label_write: write label for next uploaded digest list. + */ +static ssize_t digest_list_label_write(struct file *file, + const char __user *buf, size_t datalen, + loff_t *ppos) +{ + int rc, i; + + if (datalen >= sizeof(digest_list_label)) + return -EINVAL; + + rc = copy_from_user(digest_list_label, buf, datalen); + if (rc) + return -EFAULT; + + for (i = 0; i < datalen; i++) { + if (!isgraph(digest_list_label[i]) && + digest_list_label[i] != '\0') { + memset(digest_list_label, 0, sizeof(digest_list_label)); + return -EINVAL; + } + } + + return datalen; +} + +static const struct file_operations digest_list_label_ops = { + .open = generic_file_open, + .write = digest_list_label_write, + .read = seq_read, + .llseek = generic_file_llseek, +}; + static int __init diglim_fs_init(void) { diglim_dir = securityfs_create_dir("diglim", integrity_dir); @@ -576,8 +617,15 @@ static int __init diglim_fs_init(void) if (IS_ERR(digest_list_del_dentry)) goto out; + digest_list_label_dentry = securityfs_create_file("digest_list_label", + 0600, diglim_dir, NULL, + &digest_list_label_ops); + if (IS_ERR(digest_list_label_dentry)) + goto out; + return 0; out: + securityfs_remove(digest_list_label_dentry); securityfs_remove(digest_list_del_dentry); securityfs_remove(digest_list_add_dentry); securityfs_remove(digest_lists_loaded_dir);