[deliverable/linux.git] / include / linux / user_namespace.h

#ifndef _LINUX_USER_NAMESPACE_H
#define _LINUX_USER_NAMESPACE_H

#include <linux/kref.h>
#include <linux/nsproxy.h>
#include <linux/ns_common.h>
#include <linux/sched.h>
#include <linux/err.h>

#define UID_GID_MAP_MAX_EXTENTS 5

struct uid_gid_map {	/* 64 bytes -- 1 cache line */
	u32 nr_extents;
	struct uid_gid_extent {
		u32 first;
		u32 lower_first;
		u32 count;
	} extent[UID_GID_MAP_MAX_EXTENTS];
};

#define USERNS_SETGROUPS_ALLOWED 1UL

#define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED

struct user_namespace {
	struct uid_gid_map	uid_map;
	struct uid_gid_map	gid_map;
	struct uid_gid_map	projid_map;
	atomic_t		count;
	struct user_namespace	*parent;
	int			level;
	kuid_t			owner;
	kgid_t			group;
	struct ns_common	ns;
	unsigned long		flags;

	/* Register of per-UID persistent keyrings for this namespace */
#ifdef CONFIG_PERSISTENT_KEYRINGS
	struct key		*persistent_keyring_register;
	struct rw_semaphore	persistent_keyring_register_sem;
#endif
};

extern struct user_namespace init_user_ns;

#ifdef CONFIG_USER_NS

static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
{
	if (ns)
		atomic_inc(&ns->count);
	return ns;
}

extern int create_user_ns(struct cred *new);
extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
extern void free_user_ns(struct user_namespace *ns);

static inline void put_user_ns(struct user_namespace *ns)
{
	if (ns && atomic_dec_and_test(&ns->count))
		free_user_ns(ns);
}

struct seq_operations;
extern const struct seq_operations proc_uid_seq_operations;
extern const struct seq_operations proc_gid_seq_operations;
extern const struct seq_operations proc_projid_seq_operations;
extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *);
extern int proc_setgroups_show(struct seq_file *m, void *v);
extern bool userns_may_setgroups(const struct user_namespace *ns);
#else

static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
{
	return &init_user_ns;
}

static inline int create_user_ns(struct cred *new)
{
	return -EINVAL;
}

static inline int unshare_userns(unsigned long unshare_flags,
				 struct cred **new_cred)
{
	if (unshare_flags & CLONE_NEWUSER)
		return -EINVAL;
	return 0;
}

static inline void put_user_ns(struct user_namespace *ns)
{
}

static inline bool userns_may_setgroups(const struct user_namespace *ns)
{
	return true;
}
#endif

#endif /* _LINUX_USER_H */
Commit	Line	Data
acce292c CLG	1	#ifndef _LINUX_USER_NAMESPACE_H
	2	#define _LINUX_USER_NAMESPACE_H
	3
	4	#include <linux/kref.h>
	5	#include <linux/nsproxy.h>
435d5f4b	6	#include <linux/ns_common.h>
acce292c	7	#include <linux/sched.h>
77ec739d	8	#include <linux/err.h>
acce292c	9
22d917d8 EB	10	#define UID_GID_MAP_MAX_EXTENTS 5
	11
	12	struct uid_gid_map { /* 64 bytes -- 1 cache line */
	13	u32 nr_extents;
	14	struct uid_gid_extent {
	15	u32 first;
	16	u32 lower_first;
	17	u32 count;
	18	} extent[UID_GID_MAP_MAX_EXTENTS];
	19	};
	20
9cc46516 EB	21	#define USERNS_SETGROUPS_ALLOWED 1UL
	22
	23	#define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED
	24
acce292c	25	struct user_namespace {
22d917d8 EB	26	struct uid_gid_map uid_map;
22d917d8 EB	27	struct uid_gid_map gid_map;
f76d207a	28	struct uid_gid_map projid_map;
c61a2810	29	atomic_t count;
aeb3ae9d	30	struct user_namespace *parent;
8742f229	31	int level;
783291e6 EB	32	kuid_t owner;
783291e6 EB	33	kgid_t group;
435d5f4b	34	struct ns_common ns;
9cc46516	35	unsigned long flags;
f36f8c75 DH	36
	37	/* Register of per-UID persistent keyrings for this namespace */
	38	#ifdef CONFIG_PERSISTENT_KEYRINGS
	39	struct key *persistent_keyring_register;
	40	struct rw_semaphore persistent_keyring_register_sem;
	41	#endif
acce292c CLG	42	};
	43
	44	extern struct user_namespace init_user_ns;
	45
	46	#ifdef CONFIG_USER_NS
	47
	48	static inline struct user_namespace get_user_ns(struct user_namespace ns)
	49	{
	50	if (ns)
c61a2810	51	atomic_inc(&ns->count);
acce292c CLG	52	return ns;
	53	}
	54
18b6e041	55	extern int create_user_ns(struct cred *new);
b2e0d987	56	extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
c61a2810	57	extern void free_user_ns(struct user_namespace *ns);
acce292c CLG	58
	59	static inline void put_user_ns(struct user_namespace *ns)
	60	{
c61a2810 EB	61	if (ns && atomic_dec_and_test(&ns->count))
c61a2810 EB	62	free_user_ns(ns);
acce292c CLG	63	}
acce292c CLG	64
22d917d8	65	struct seq_operations;
ccf94f1b FF	66	extern const struct seq_operations proc_uid_seq_operations;
	67	extern const struct seq_operations proc_gid_seq_operations;
	68	extern const struct seq_operations proc_projid_seq_operations;
22d917d8 EB	69	extern ssize_t proc_uid_map_write(struct file , const char __user , size_t, loff_t *);
22d917d8 EB	70	extern ssize_t proc_gid_map_write(struct file , const char __user , size_t, loff_t *);
f76d207a	71	extern ssize_t proc_projid_map_write(struct file , const char __user , size_t, loff_t *);
9cc46516 EB	72	extern ssize_t proc_setgroups_write(struct file , const char __user , size_t, loff_t *);
9cc46516 EB	73	extern int proc_setgroups_show(struct seq_file m, void v);
273d2c67	74	extern bool userns_may_setgroups(const struct user_namespace *ns);
acce292c CLG	75	#else
	76
	77	static inline struct user_namespace get_user_ns(struct user_namespace ns)
	78	{
	79	return &init_user_ns;
	80	}
	81
18b6e041	82	static inline int create_user_ns(struct cred *new)
acce292c	83	{
18b6e041	84	return -EINVAL;
acce292c CLG	85	}
acce292c CLG	86
b2e0d987 EB	87	static inline int unshare_userns(unsigned long unshare_flags,
	88	struct cred **new_cred)
	89	{
	90	if (unshare_flags & CLONE_NEWUSER)
	91	return -EINVAL;
	92	return 0;
	93	}
	94
acce292c CLG	95	static inline void put_user_ns(struct user_namespace *ns)
	96	{
	97	}
	98
273d2c67 EB	99	static inline bool userns_may_setgroups(const struct user_namespace *ns)
	100	{
	101	return true;
	102	}
22d917d8 EB	103	#endif
22d917d8 EB	104
acce292c	105	#endif /* _LINUX_USER_H */