1 files changed, 24 insertions, 0 deletions
diff --git a/security/landlock/fs.h b/security/landlock/fs.h
index 8db7acf9109b..488e4813680a 100644
--- a/security/landlock/fs.h
+++ b/security/landlock/fs.h
@@ -37,6 +37,24 @@ struct landlock_inode_security {
 };
 
 /**
+ * struct landlock_file_security - File security blob
+ *
+ * This information is populated when opening a file in hook_file_open, and
+ * tracks the relevant Landlock access rights that were available at the time
+ * of opening the file. Other LSM hooks use these rights in order to authorize
+ * operations on already opened files.
+ */
+struct landlock_file_security {
+	/**
+	 * @allowed_access: Access rights that were available at the time of
+	 * opening the file. This is not necessarily the full set of access
+	 * rights available at that time, but it's the necessary subset as
+	 * needed to authorize later operations on the open file.
+	 */
+	access_mask_t allowed_access;
+};
+
+/**
  * struct landlock_superblock_security - Superblock security blob
  *
  * Enable hook_sb_delete() to wait for concurrent calls to release_inode().
@@ -50,6 +68,12 @@ struct landlock_superblock_security {
 	atomic_long_t inode_refs;
 };
 
+static inline struct landlock_file_security *
+landlock_file(const struct file *const file)
+{
+	return file->f_security + landlock_blob_sizes.lbs_file;
+}
+
 static inline struct landlock_inode_security *
 landlock_inode(const struct inode *const inode)
 {