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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Landlock - Domain management
*
* Copyright © 2016-2020 Mickaël Salaün <mic@digikod.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 */
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