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 <roberto.sassu@xxxxxxxxxx>
---
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);
--
2.25.1
