Release 4.12 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/workqueue.h>
#include <linux/rwsem.h>
#include <linux/sysctl.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 ucounts;


enum ucount_type {
	
UCOUNT_USER_NAMESPACES,
	
UCOUNT_PID_NAMESPACES,
	
UCOUNT_UTS_NAMESPACES,
	
UCOUNT_IPC_NAMESPACES,
	
UCOUNT_NET_NAMESPACES,
	
UCOUNT_MNT_NAMESPACES,
	
UCOUNT_CGROUP_NAMESPACES,
#ifdef CONFIG_INOTIFY_USER
	
UCOUNT_INOTIFY_INSTANCES,
	
UCOUNT_INOTIFY_WATCHES,
#endif
	
UCOUNT_COUNTS,
};


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
	
struct work_struct	work;
#ifdef CONFIG_SYSCTL
	
struct ctl_table_set	set;
	
struct ctl_table_header *sysctls;
#endif
	
struct ucounts		*ucounts;
	
int ucount_max[UCOUNT_COUNTS];
};


struct ucounts {
	
struct hlist_node node;
	
struct user_namespace *ns;
	
kuid_t uid;
	
int count;
	
atomic_t ucount[UCOUNT_COUNTS];
};

extern struct user_namespace init_user_ns;

bool setup_userns_sysctls(struct user_namespace *ns);
void retire_userns_sysctls(struct user_namespace *ns);
struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid, enum ucount_type type);
void dec_ucount(struct ucounts *ucounts, enum ucount_type type);

#ifdef CONFIG_USER_NS



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

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



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

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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);
extern bool current_in_userns(const struct user_namespace *target_ns);

struct ns_common *ns_get_owner(struct ns_common *ns);
#else



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

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

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

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

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

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static inline bool current_in_userns(const struct user_namespace *target_ns)
{
	return true;
}

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static inline struct ns_common *ns_get_owner(struct ns_common *ns)
{
	return ERR_PTR(-EPERM);
}
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#endif

#endif /* _LINUX_USER_H */
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Directory: include/linux

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