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Message-ID: <20241022161009.982584-6-mic@digikod.net>
Date: Tue, 22 Oct 2024 18:10:00 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Eric Paris <eparis@...hat.com>,
Paul Moore <paul@...l-moore.com>,
Günther Noack <gnoack@...gle.com>,
"Serge E . Hallyn" <serge@...lyn.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
Ben Scarlato <akhna@...gle.com>,
Casey Schaufler <casey@...aufler-ca.com>,
Charles Zaffery <czaffery@...lox.com>,
James Morris <jmorris@...ei.org>,
Jann Horn <jannh@...gle.com>,
Jeff Xu <jeffxu@...gle.com>,
Jorge Lucangeli Obes <jorgelo@...gle.com>,
Kees Cook <kees@...nel.org>,
Konstantin Meskhidze <konstantin.meskhidze@...wei.com>,
Matt Bobrowski <mattbobrowski@...gle.com>,
Mikhail Ivanov <ivanov.mikhail1@...wei-partners.com>,
Praveen K Paladugu <prapal@...ux.microsoft.com>,
Robert Salvet <robert.salvet@...lox.com>,
Shervin Oloumi <enlightened@...gle.com>,
Song Liu <song@...nel.org>,
Tahera Fahimi <fahimitahera@...il.com>,
audit@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org
Subject: [RFC PATCH v2 05/14] landlock: Move access types
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@...gle.com>
Signed-off-by: Mickaël Salaün <mic@...ikod.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@...ikod.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
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