mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-02 08:34:20 +08:00
385975dca5
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>
59 lines
1.3 KiB
C
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 */
|