[RFC PATCH v2 05/14] landlock: Move access types

[Mickaël Salaün]

Move ACCESS_FS_OPTIONAL, access_mask_t, struct access_mask, and struct
access_masks_all to a dedicated access.h file.

This file will be extended with a following commit, and it will help to
avoid dependency loops.

Cc: Günther Noack <gnoack at google.com>
Signed-off-by: Mickaël Salaün <mic at digikod.net>
Link: https://lore.kernel.org/r/20241022161009.982584-6-mic@digikod.net
---

Changes since v1:
* New patch
---
 security/landlock/access.h  | 53 +++++++++++++++++++++++++++++++++++++
 security/landlock/fs.c      |  1 +
 security/landlock/fs.h      |  1 +
 security/landlock/ruleset.h | 31 +---------------------
 4 files changed, 56 insertions(+), 30 deletions(-)
 create mode 100644 security/landlock/access.h

diff --git a/security/landlock/access.h b/security/landlock/access.h
new file mode 100644
index 000000000000..2659fd9b4aaf
--- /dev/null
+++ b/security/landlock/access.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Landlock LSM - Access types and helpers
+ *
+ * Copyright © 2016-2020 Mickaël Salaün <mic at digikod.net>
+ * Copyright © 2018-2020 ANSSI
+ * Copyright © 2024 Microsoft Corporation
+ */
+
+#ifndef _SECURITY_LANDLOCK_ACCESS_H
+#define _SECURITY_LANDLOCK_ACCESS_H
+
+#include <uapi/linux/landlock.h>
+
+#include "limits.h"
+
+/* clang-format off */
+#define ACCESS_FS_OPTIONAL ( \
+	LANDLOCK_ACCESS_FS_TRUNCATE | \
+	LANDLOCK_ACCESS_FS_IOCTL_DEV)
+/* clang-format on */
+
+typedef u16 access_mask_t;
+/* Makes sure all filesystem access rights can be stored. */
+static_assert(BITS_PER_TYPE(access_mask_t) >= LANDLOCK_NUM_ACCESS_FS);
+/* Makes sure all network access rights can be stored. */
+static_assert(BITS_PER_TYPE(access_mask_t) >= LANDLOCK_NUM_ACCESS_NET);
+/* Makes sure all scoped rights can be stored. */
+static_assert(BITS_PER_TYPE(access_mask_t) >= LANDLOCK_NUM_SCOPE);
+/* Makes sure for_each_set_bit() and for_each_clear_bit() calls are OK. */
+static_assert(sizeof(unsigned long) >= sizeof(access_mask_t));
+
+/* Ruleset access masks. */
+struct access_masks {
+	access_mask_t fs : LANDLOCK_NUM_ACCESS_FS;
+	access_mask_t net : LANDLOCK_NUM_ACCESS_NET;
+	access_mask_t scope : LANDLOCK_NUM_SCOPE;
+};
+
+union access_masks_all {
+	struct access_masks masks;
+	u32 all;
+};
+
+/* Makes sure all fields are covered. */
+static_assert(sizeof(((union access_masks_all *)NULL)->masks) ==
+	      sizeof(((union access_masks_all *)NULL)->all));
+
+typedef u16 layer_mask_t;
+/* Makes sure all layers can be checked. */
+static_assert(BITS_PER_TYPE(layer_mask_t) >= LANDLOCK_MAX_NUM_LAYERS);
+
+#endif /* _SECURITY_LANDLOCK_ACCESS_H */
diff --git a/security/landlock/fs.c b/security/landlock/fs.c
index 698a623a8184..e0e5775b75ae 100644
--- a/security/landlock/fs.c
+++ b/security/landlock/fs.c
@@ -36,6 +36,7 @@
 #include <uapi/linux/fiemap.h>
 #include <uapi/linux/landlock.h>
 
+#include "access.h"
 #include "common.h"
 #include "cred.h"
 #include "fs.h"
diff --git a/security/landlock/fs.h b/security/landlock/fs.h
index 1487e1f023a1..d445f411c26a 100644
--- a/security/landlock/fs.h
+++ b/security/landlock/fs.h
@@ -13,6 +13,7 @@
 #include <linux/init.h>
 #include <linux/rcupdate.h>
 
+#include "access.h"
 #include "ruleset.h"
 #include "setup.h"
 
diff --git a/security/landlock/ruleset.h b/security/landlock/ruleset.h
index e00edcb38c5b..7921bbe01344 100644
--- a/security/landlock/ruleset.h
+++ b/security/landlock/ruleset.h
@@ -17,6 +17,7 @@
 #include <linux/workqueue.h>
 #include <uapi/linux/landlock.h>
 
+#include "access.h"
 #include "limits.h"
 #include "object.h"
 
@@ -30,36 +31,6 @@
 	LANDLOCK_ACCESS_FS_REFER)
 /* clang-format on */
 
-typedef u16 access_mask_t;
-/* Makes sure all filesystem access rights can be stored. */
-static_assert(BITS_PER_TYPE(access_mask_t) >= LANDLOCK_NUM_ACCESS_FS);
-/* Makes sure all network access rights can be stored. */
-static_assert(BITS_PER_TYPE(access_mask_t) >= LANDLOCK_NUM_ACCESS_NET);
-/* Makes sure all scoped rights can be stored. */
-static_assert(BITS_PER_TYPE(access_mask_t) >= LANDLOCK_NUM_SCOPE);
-/* Makes sure for_each_set_bit() and for_each_clear_bit() calls are OK. */
-static_assert(sizeof(unsigned long) >= sizeof(access_mask_t));
-
-/* Ruleset access masks. */
-struct access_masks {
-	access_mask_t fs : LANDLOCK_NUM_ACCESS_FS;
-	access_mask_t net : LANDLOCK_NUM_ACCESS_NET;
-	access_mask_t scope : LANDLOCK_NUM_SCOPE;
-};
-
-union access_masks_all {
-	struct access_masks masks;
-	u32 all;
-};
-
-/* Makes sure all fields are covered. */
-static_assert(sizeof(((union access_masks_all *)NULL)->masks) ==
-	      sizeof(((union access_masks_all *)NULL)->all));
-
-typedef u16 layer_mask_t;
-/* Makes sure all layers can be checked. */
-static_assert(BITS_PER_TYPE(layer_mask_t) >= LANDLOCK_MAX_NUM_LAYERS);
-
 /**
  * struct landlock_layer - Access rights for a given layer
  */
-- 
2.47.0