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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 */
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