[RFC][PATCH v2 08/12] diglim: Interfaces - digest_label

Roberto Sassu
2021-07-26T16:40:51Z

Introduce 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>
---
security/integrity/diglim/fs.c | 40 ++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)

diff --git a/security/integrity/diglim/fs.c b/security/integrity/diglim/fs.c
index caf2923c9146..8958e987f708 100644
--- a/security/integrity/diglim/fs.c
+++ b/security/integrity/diglim/fs.c
@@ -36,6 +36,13 @@ static struct dentry *diglim_dir;
* removed.
*/
static struct dentry *digest_lists_loaded_dir;
+/**
+ * DOC: 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.
+ */
+static struct dentry *digest_label_dentry;
/**
* DOC: digest_list_add
*
@@ -505,6 +512,32 @@ 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)
+ return -EFAULT;
+
+ 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 diglim_fs_init(void)
{
diglim_dir = securityfs_create_dir("diglim", integrity_dir);
@@ -528,8 +561,15 @@ static int __init diglim_fs_init(void)
if (IS_ERR(digest_list_del_dentry))
goto out;

+ digest_label_dentry = securityfs_create_file("digest_label", 0600,
+ diglim_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