linux-integrity.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Roberto Sassu <roberto.sassu@huawei.com>
To: <zohar@linux.ibm.com>
Cc: <linux-integrity@vger.kernel.org>,
	<linux-security-module@vger.kernel.org>,
	<linux-doc@vger.kernel.org>, <linux-kselftest@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	Roberto Sassu <roberto.sassu@huawei.com>
Subject: [RFC][PATCH 09/12] digest_lists: Interfaces - digest_label
Date: Fri, 25 Jun 2021 18:56:11 +0200	[thread overview]
Message-ID: <20210625165614.2284243-10-roberto.sassu@huawei.com> (raw)
In-Reply-To: <20210625165614.2284243-1-roberto.sassu@huawei.com>

This patch introduces the digest_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 <roberto.sassu@huawei.com>
---
 Documentation/security/digest_lists.rst |  7 +++++
 security/integrity/digest_lists/fs.c    | 34 +++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/Documentation/security/digest_lists.rst b/Documentation/security/digest_lists.rst
index 8f245fae6825..d83279046a55 100644
--- a/Documentation/security/digest_lists.rst
+++ b/Documentation/security/digest_lists.rst
@@ -683,3 +683,10 @@ other (with .ascii prefix) shows the digest list in ASCII format.
 
 Files are added and removed at the same time digest lists are added and
 removed.
+
+
+``digest_label``
+~~~~~~~~~~~~~~~~
+
+``digest_label`` can be used to set a label to be applied to the next
+digest list (buffer) loaded ``through digest_list_add``.
diff --git a/security/integrity/digest_lists/fs.c b/security/integrity/digest_lists/fs.c
index f665ef063df7..f6e88fac27bc 100644
--- a/security/integrity/digest_lists/fs.c
+++ b/security/integrity/digest_lists/fs.c
@@ -34,6 +34,7 @@
 
 static struct dentry *digest_lists_dir;
 static struct dentry *digest_lists_loaded_dir;
+static struct dentry *digest_label_dentry;
 static struct dentry *digest_list_add_dentry;
 static struct dentry *digest_list_del_dentry;
 char digest_label[NAME_MAX + 1];
@@ -465,6 +466,32 @@ static const struct file_operations digest_list_upload_ops = {
 	.llseek = generic_file_llseek,
 };
 
+/*
+ * digest_label_write: write label for next uploaded digest list.
+ */
+static ssize_t digest_label_write(struct file *file, const char __user *buf,
+				  size_t datalen, loff_t *ppos)
+{
+	int rc;
+
+	if (datalen >= sizeof(digest_label))
+		return -EINVAL;
+
+	rc = copy_from_user(digest_label, buf, datalen);
+	if (rc < 0)
+		return rc;
+
+	digest_label[datalen] = '\0';
+	return datalen;
+}
+
+static const struct file_operations digest_label_ops = {
+	.open = generic_file_open,
+	.write = digest_label_write,
+	.read = seq_read,
+	.llseek = generic_file_llseek,
+};
+
 static int __init digest_lists_fs_init(void)
 {
 	digest_lists_dir = securityfs_create_dir("digest_lists", integrity_dir);
@@ -488,8 +515,15 @@ static int __init digest_lists_fs_init(void)
 	if (IS_ERR(digest_list_del_dentry))
 		goto out;
 
+	digest_label_dentry = securityfs_create_file("digest_label", 0600,
+						     digest_lists_dir, NULL,
+						     &digest_label_ops);
+	if (IS_ERR(digest_label_dentry))
+		goto out;
+
 	return 0;
 out:
+	securityfs_remove(digest_label_dentry);
 	securityfs_remove(digest_list_del_dentry);
 	securityfs_remove(digest_list_add_dentry);
 	securityfs_remove(digest_lists_loaded_dir);
-- 
2.25.1


  parent reply	other threads:[~2021-06-25 16:58 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-25 16:56 [RFC][PATCH 00/12] Huawei Digest Lists Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 01/12] ima: Add digest, algo, measured parameters to ima_measure_critical_data() Roberto Sassu
2021-06-25 18:26   ` Mimi Zohar
2021-06-25 16:56 ` [RFC][PATCH 02/12] digest_lists: Overview Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 03/12] digest_lists: Basic definitions Roberto Sassu
2021-06-27 10:53   ` Greg KH
2021-06-27 15:23     ` Matthew Wilcox
2021-06-27 15:35       ` Greg KH
2021-06-28  8:30     ` Roberto Sassu
2021-06-28  8:46       ` Greg KH
2021-06-28  9:27         ` Roberto Sassu
2021-06-28  9:32           ` Greg KH
2021-06-28  9:51             ` Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 04/12] digest_lists: Objects Roberto Sassu
2021-06-27 10:56   ` Greg KH
2021-06-28  8:14     ` Roberto Sassu
2021-06-28  8:47       ` Greg KH
2021-06-25 16:56 ` [RFC][PATCH 05/12] digest_lists: Methods Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 06/12] digest_lists: Parser Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 07/12] digest_lists: Interfaces - digest_list_add, digest_list_del Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 08/12] digest_lists: Interfaces - digest_lists_loaded Roberto Sassu
2021-06-25 16:56 ` Roberto Sassu [this message]
2021-06-25 16:56 ` [RFC][PATCH 10/12] digest_lists: Interfaces - digest_query Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 11/12] digest_lists: Interfaces - digests_count Roberto Sassu
2021-06-25 16:56 ` [RFC][PATCH 12/12] digest_lists: Tests Roberto Sassu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210625165614.2284243-10-roberto.sassu@huawei.com \
    --to=roberto.sassu@huawei.com \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-integrity@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-kselftest@vger.kernel.org \
    --cc=linux-security-module@vger.kernel.org \
    --cc=zohar@linux.ibm.com \
    --subject='Re: [RFC][PATCH 09/12] digest_lists: Interfaces - digest_label' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).