linux/security/landlock/cred.h
Mickaël Salaün 385975dca5 landlock: Set up the security framework and manage credentials
Process's credentials point to a Landlock domain, which is underneath
implemented with a ruleset.  In the following commits, this domain is
used to check and enforce the ptrace and filesystem security policies.
A domain is inherited from a parent to its child the same way a thread
inherits a seccomp policy.

Cc: James Morris <jmorris@namei.org>
Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>
Reviewed-by: Jann Horn <jannh@google.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210422154123.13086-4-mic@digikod.net
Signed-off-by: James Morris <jamorris@linux.microsoft.com>
2021-04-22 12:22:10 -07:00

59 lines
1.3 KiB
C

/* 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 */