[linux-2.6-block.git] / include / linux / pid_namespace.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PID_NS_H
#define _LINUX_PID_NS_H

#include <linux/sched.h>
#include <linux/bug.h>
#include <linux/mm.h>
#include <linux/workqueue.h>
#include <linux/threads.h>
#include <linux/nsproxy.h>
#include <linux/ns_common.h>
#include <linux/idr.h>

/* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */
#define MAX_PID_NS_LEVEL 32

struct fs_pin;

#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
/* modes for vm.memfd_noexec sysctl */
#define MEMFD_NOEXEC_SCOPE_EXEC			0 /* MFD_EXEC implied if unset */
#define MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL		1 /* MFD_NOEXEC_SEAL implied if unset */
#define MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED	2 /* same as 1, except MFD_EXEC rejected */
#endif

struct pid_namespace {
	struct idr idr;
	struct rcu_head rcu;
	unsigned int pid_allocated;
	struct task_struct *child_reaper;
	struct kmem_cache *pid_cachep;
	unsigned int level;
	int pid_max;
	struct pid_namespace *parent;
#ifdef CONFIG_BSD_PROCESS_ACCT
	struct fs_pin *bacct;
#endif
	struct user_namespace *user_ns;
	struct ucounts *ucounts;
	int reboot;	/* group exit code if this pidns was rebooted */
	struct ns_common ns;
	struct work_struct	work;
#ifdef CONFIG_SYSCTL
	struct ctl_table_set	set;
	struct ctl_table_header *sysctls;
#if defined(CONFIG_MEMFD_CREATE)
	int memfd_noexec_scope;
#endif
#endif
} __randomize_layout;

extern struct pid_namespace init_pid_ns;

#define PIDNS_ADDING (1U << 31)

#ifdef CONFIG_PID_NS
static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
	if (ns != &init_pid_ns)
		refcount_inc(&ns->ns.count);
	return ns;
}

#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
{
	int scope = MEMFD_NOEXEC_SCOPE_EXEC;

	for (; ns; ns = ns->parent)
		scope = max(scope, READ_ONCE(ns->memfd_noexec_scope));

	return scope;
}
#else
static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
{
	return 0;
}
#endif

extern struct pid_namespace *copy_pid_ns(unsigned long flags,
	struct user_namespace *user_ns, struct pid_namespace *ns);
extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
extern void put_pid_ns(struct pid_namespace *ns);

#else /* !CONFIG_PID_NS */
#include <linux/err.h>

static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
	return ns;
}

static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
{
	return 0;
}

static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
	struct user_namespace *user_ns, struct pid_namespace *ns)
{
	if (flags & CLONE_NEWPID)
		ns = ERR_PTR(-EINVAL);
	return ns;
}

static inline void put_pid_ns(struct pid_namespace *ns)
{
}

static inline void zap_pid_ns_processes(struct pid_namespace *ns)
{
	BUG();
}

static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
{
	return 0;
}
#endif /* CONFIG_PID_NS */

extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
void pidhash_init(void);
void pid_idr_init(void);
int register_pidns_sysctls(struct pid_namespace *pidns);
void unregister_pidns_sysctls(struct pid_namespace *pidns);

static inline bool task_is_in_init_pid_ns(struct task_struct *tsk)
{
	return task_active_pid_ns(tsk) == &init_pid_ns;
}

#endif /* _LINUX_PID_NS_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _LINUX_PID_NS_H
	3	#define _LINUX_PID_NS_H
	4
	5	#include <linux/sched.h>
	6	#include <linux/bug.h>
	7	#include <linux/mm.h>
	8	#include <linux/workqueue.h>
	9	#include <linux/threads.h>
	10	#include <linux/nsproxy.h>
	11	#include <linux/ns_common.h>
	12	#include <linux/idr.h>
	13
	14	/* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */
	15	#define MAX_PID_NS_LEVEL 32
	16
	17	struct fs_pin;
	18
	19	#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
	20	/* modes for vm.memfd_noexec sysctl */
	21	#define MEMFD_NOEXEC_SCOPE_EXEC 0 /* MFD_EXEC implied if unset */
	22	#define MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL 1 /* MFD_NOEXEC_SEAL implied if unset */
	23	#define MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED 2 /* same as 1, except MFD_EXEC rejected */
	24	#endif
	25
	26	struct pid_namespace {
	27	struct idr idr;
	28	struct rcu_head rcu;
	29	unsigned int pid_allocated;
	30	struct task_struct *child_reaper;
	31	struct kmem_cache *pid_cachep;
	32	unsigned int level;
	33	int pid_max;
	34	struct pid_namespace *parent;
	35	#ifdef CONFIG_BSD_PROCESS_ACCT
	36	struct fs_pin *bacct;
	37	#endif
	38	struct user_namespace *user_ns;
	39	struct ucounts *ucounts;
	40	int reboot; /* group exit code if this pidns was rebooted */
	41	struct ns_common ns;
	42	struct work_struct work;
	43	#ifdef CONFIG_SYSCTL
	44	struct ctl_table_set set;
	45	struct ctl_table_header *sysctls;
	46	#if defined(CONFIG_MEMFD_CREATE)
	47	int memfd_noexec_scope;
	48	#endif
	49	#endif
	50	} __randomize_layout;
	51
	52	extern struct pid_namespace init_pid_ns;
	53
	54	#define PIDNS_ADDING (1U << 31)
	55
	56	#ifdef CONFIG_PID_NS
	57	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	58	{
	59	if (ns != &init_pid_ns)
	60	refcount_inc(&ns->ns.count);
	61	return ns;
	62	}
	63
	64	#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
	65	static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
	66	{
	67	int scope = MEMFD_NOEXEC_SCOPE_EXEC;
	68
	69	for (; ns; ns = ns->parent)
	70	scope = max(scope, READ_ONCE(ns->memfd_noexec_scope));
	71
	72	return scope;
	73	}
	74	#else
	75	static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
	76	{
	77	return 0;
	78	}
	79	#endif
	80
	81	extern struct pid_namespace *copy_pid_ns(unsigned long flags,
	82	struct user_namespace user_ns, struct pid_namespace ns);
	83	extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
	84	extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
	85	extern void put_pid_ns(struct pid_namespace *ns);
	86
	87	#else /* !CONFIG_PID_NS */
	88	#include <linux/err.h>
	89
	90	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	91	{
	92	return ns;
	93	}
	94
	95	static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
	96	{
	97	return 0;
	98	}
	99
	100	static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
	101	struct user_namespace user_ns, struct pid_namespace ns)
	102	{
	103	if (flags & CLONE_NEWPID)
	104	ns = ERR_PTR(-EINVAL);
	105	return ns;
	106	}
	107
	108	static inline void put_pid_ns(struct pid_namespace *ns)
	109	{
	110	}
	111
	112	static inline void zap_pid_ns_processes(struct pid_namespace *ns)
	113	{
	114	BUG();
	115	}
	116
	117	static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
	118	{
	119	return 0;
	120	}
	121	#endif /* CONFIG_PID_NS */
	122
	123	extern struct pid_namespace task_active_pid_ns(struct task_struct tsk);
	124	void pidhash_init(void);
	125	void pid_idr_init(void);
	126	int register_pidns_sysctls(struct pid_namespace *pidns);
	127	void unregister_pidns_sysctls(struct pid_namespace *pidns);
	128
	129	static inline bool task_is_in_init_pid_ns(struct task_struct *tsk)
	130	{
	131	return task_active_pid_ns(tsk) == &init_pid_ns;
	132	}
	133
	134	#endif /* _LINUX_PID_NS_H */