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Message-ID: <20241022161009.982584-7-mic@digikod.net>
Date: Tue, 22 Oct 2024 18:10:01 +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 06/14] landlock: Move domain hierarchy management
Create a new domain.h file containing the struct landlock_hierarchy
definition and helpers. This type will grow with audit support. This
also prepares for a new domain type.
Cc: Günther Noack <gnoack@...gle.com>
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Link: https://lore.kernel.org/r/20241022161009.982584-7-mic@digikod.net
---
Changes since v1:
* New patch.
---
security/landlock/domain.h | 48 +++++++++++++++++++++++++++++++++++++
security/landlock/ruleset.c | 21 +++-------------
security/landlock/ruleset.h | 17 +------------
security/landlock/task.c | 1 +
4 files changed, 53 insertions(+), 34 deletions(-)
create mode 100644 security/landlock/domain.h
diff --git a/security/landlock/domain.h b/security/landlock/domain.h
new file mode 100644
index 000000000000..015d61fd81ec
--- /dev/null
+++ b/security/landlock/domain.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Landlock LSM - Domain management
+ *
+ * Copyright © 2016-2020 Mickaël Salaün <mic@...ikod.net>
+ * Copyright © 2018-2020 ANSSI
+ */
+
+#ifndef _SECURITY_LANDLOCK_DOMAIN_H
+#define _SECURITY_LANDLOCK_DOMAIN_H
+
+#include <linux/mm.h>
+#include <linux/refcount.h>
+
+/**
+ * struct landlock_hierarchy - Node in a domain hierarchy
+ */
+struct landlock_hierarchy {
+ /**
+ * @parent: Pointer to the parent node, or NULL if it is a root
+ * Landlock domain.
+ */
+ struct landlock_hierarchy *parent;
+ /**
+ * @usage: Number of potential children domains plus their parent
+ * domain.
+ */
+ refcount_t usage;
+};
+
+static inline void
+landlock_get_hierarchy(struct landlock_hierarchy *const hierarchy)
+{
+ if (hierarchy)
+ refcount_inc(&hierarchy->usage);
+}
+
+static inline void landlock_put_hierarchy(struct landlock_hierarchy *hierarchy)
+{
+ while (hierarchy && refcount_dec_and_test(&hierarchy->usage)) {
+ const struct landlock_hierarchy *const freeme = hierarchy;
+
+ hierarchy = hierarchy->parent;
+ kfree(freeme);
+ }
+}
+
+#endif /* _SECURITY_LANDLOCK_DOMAIN_H */
diff --git a/security/landlock/ruleset.c b/security/landlock/ruleset.c
index a93bdbf52fff..57cb7dcd6333 100644
--- a/security/landlock/ruleset.c
+++ b/security/landlock/ruleset.c
@@ -20,6 +20,7 @@
#include <linux/spinlock.h>
#include <linux/workqueue.h>
+#include "domain.h"
#include "limits.h"
#include "object.h"
#include "ruleset.h"
@@ -304,22 +305,6 @@ int landlock_insert_rule(struct landlock_ruleset *const ruleset,
return insert_rule(ruleset, id, &layers, ARRAY_SIZE(layers));
}
-static void get_hierarchy(struct landlock_hierarchy *const hierarchy)
-{
- if (hierarchy)
- refcount_inc(&hierarchy->usage);
-}
-
-static void put_hierarchy(struct landlock_hierarchy *hierarchy)
-{
- while (hierarchy && refcount_dec_and_test(&hierarchy->usage)) {
- const struct landlock_hierarchy *const freeme = hierarchy;
-
- hierarchy = hierarchy->parent;
- kfree(freeme);
- }
-}
-
static int merge_tree(struct landlock_ruleset *const dst,
struct landlock_ruleset *const src,
const enum landlock_key_type key_type)
@@ -473,7 +458,7 @@ static int inherit_ruleset(struct landlock_ruleset *const parent,
err = -EINVAL;
goto out_unlock;
}
- get_hierarchy(parent->hierarchy);
+ landlock_get_hierarchy(parent->hierarchy);
child->hierarchy->parent = parent->hierarchy;
out_unlock:
@@ -497,7 +482,7 @@ static void free_ruleset(struct landlock_ruleset *const ruleset)
free_rule(freeme, LANDLOCK_KEY_NET_PORT);
#endif /* IS_ENABLED(CONFIG_INET) */
- put_hierarchy(ruleset->hierarchy);
+ landlock_put_hierarchy(ruleset->hierarchy);
kfree(ruleset);
}
diff --git a/security/landlock/ruleset.h b/security/landlock/ruleset.h
index 7921bbe01344..d0a60a5f7cd9 100644
--- a/security/landlock/ruleset.h
+++ b/security/landlock/ruleset.h
@@ -18,6 +18,7 @@
#include <uapi/linux/landlock.h>
#include "access.h"
+#include "domain.h"
#include "limits.h"
#include "object.h"
@@ -119,22 +120,6 @@ struct landlock_rule {
struct landlock_layer layers[] __counted_by(num_layers);
};
-/**
- * struct landlock_hierarchy - Node in a ruleset hierarchy
- */
-struct landlock_hierarchy {
- /**
- * @parent: Pointer to the parent node, or NULL if it is a root
- * Landlock domain.
- */
- struct landlock_hierarchy *parent;
- /**
- * @usage: Number of potential children domains plus their parent
- * domain.
- */
- refcount_t usage;
-};
-
/**
* struct landlock_ruleset - Landlock ruleset
*
diff --git a/security/landlock/task.c b/security/landlock/task.c
index e7f45af87ff5..23b56b3772c6 100644
--- a/security/landlock/task.c
+++ b/security/landlock/task.c
@@ -18,6 +18,7 @@
#include "common.h"
#include "cred.h"
+#include "domain.h"
#include "fs.h"
#include "ruleset.h"
#include "setup.h"
--
2.47.0
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