[PATCH 2/7] keys: Extract struct key_user to its own header for tracing purposes

David Howells
2024-08-21T12:36:35Z

Extract the key_user struct to its own header file to make it easier to
access from tracepoints.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jarkko Sakkinen <jarkko@kernel.org>
cc: keyrings@vger.kernel.org
cc: linux-security-module@vger.kernel.org
---
include/keys/key_user.h | 35 +++++++++++++++++++++++++++++++++++
security/keys/internal.h | 20 +-------------------
2 files changed, 36 insertions(+), 19 deletions(-)
create mode 100644 include/keys/key_user.h

diff --git a/include/keys/key_user.h b/include/keys/key_user.h
new file mode 100644
index 000000000000..e9c383d8116e
--- /dev/null
+++ b/include/keys/key_user.h
@@ -0,0 +1,35 @@
+/* User quota tracking for keys.
+ *
+ * Copyright (C) 2024 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _KEYS_KEY_USER_H
+#define _KEYS_KEY_USER_H
+
+/*
+ * Keep track of keys for a user.
+ *
+ * This needs to be separate to user_struct to avoid a refcount-loop
+ * (user_struct pins some keyrings which pin this struct).
+ *
+ * We also keep track of keys under request from userspace for this UID here.
+ */
+struct key_user {
+ struct rb_node node;
+ struct mutex cons_lock; /* construction initiation lock */
+ spinlock_t lock;
+ refcount_t usage; /* for accessing qnkeys & qnbytes */
+ atomic_t nkeys; /* number of keys */
+ atomic_t nikeys; /* number of instantiated keys */
+ kuid_t uid;
+ int qnkeys; /* number of keys allocated to this user */
+ int qnbytes; /* number of bytes allocated to this user */
+};
+
+#endif /* _KEYS_KEY_USER_H */
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 8ba87127e446..33c929a6bb97 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -19,6 +19,7 @@
#include <linux/compat.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
+#include <keys/key_user.h>

struct iovec;

@@ -43,25 +44,6 @@ extern struct key_type key_type_user;
extern struct key_type key_type_logon;

/*****************************************************************************/
-/*
- * Keep track of keys for a user.
- *
- * This needs to be separate to user_struct to avoid a refcount-loop
- * (user_struct pins some keyrings which pin this struct).
- *
- * We also keep track of keys under request from userspace for this UID here.
- */
-struct key_user {
- struct rb_node node;
- struct mutex cons_lock; /* construction initiation lock */
- spinlock_t lock;
- refcount_t usage; /* for accessing qnkeys & qnbytes */
- atomic_t nkeys; /* number of keys */
- atomic_t nikeys; /* number of instantiated keys */
- kuid_t uid;
- int qnkeys; /* number of keys allocated to this user */
- int qnbytes; /* number of bytes allocated to this user */
-};

extern struct rb_root key_user_tree;
extern spinlock_t key_user_lock;