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-rw-r--r--security/landlock/cred.h58
1 files changed, 58 insertions, 0 deletions
diff --git a/security/landlock/cred.h b/security/landlock/cred.h
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+++ b/security/landlock/cred.h
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Landlock LSM - Credential hooks
+ *
+ * Copyright © 2019-2020 Mickaël Salaün <mic@digikod.net>
+ * Copyright © 2019-2020 ANSSI
+ */
+
+#ifndef _SECURITY_LANDLOCK_CRED_H
+#define _SECURITY_LANDLOCK_CRED_H
+
+#include <linux/cred.h>
+#include <linux/init.h>
+#include <linux/rcupdate.h>
+
+#include "ruleset.h"
+#include "setup.h"
+
+struct landlock_cred_security {
+ struct landlock_ruleset *domain;
+};
+
+static inline struct landlock_cred_security *
+landlock_cred(const struct cred *cred)
+{
+ return cred->security + landlock_blob_sizes.lbs_cred;
+}
+
+static inline const struct landlock_ruleset *landlock_get_current_domain(void)
+{
+ return landlock_cred(current_cred())->domain;
+}
+
+/*
+ * The call needs to come from an RCU read-side critical section.
+ */
+static inline const struct landlock_ruleset *
+landlock_get_task_domain(const struct task_struct *const task)
+{
+ return landlock_cred(__task_cred(task))->domain;
+}
+
+static inline bool landlocked(const struct task_struct *const task)
+{
+ bool has_dom;
+
+ if (task == current)
+ return !!landlock_get_current_domain();
+
+ rcu_read_lock();
+ has_dom = !!landlock_get_task_domain(task);
+ rcu_read_unlock();
+ return has_dom;
+}
+
+__init void landlock_add_cred_hooks(void);
+
+#endif /* _SECURITY_LANDLOCK_CRED_H */