1 #ifndef _LINUX_USER_NAMESPACE_H
2 #define _LINUX_USER_NAMESPACE_H
4 #include <linux/kref.h>
5 #include <linux/nsproxy.h>
6 #include <linux/ns_common.h>
7 #include <linux/sched.h>
8 #include <linux/workqueue.h>
9 #include <linux/rwsem.h>
10 #include <linux/sysctl.h>
11 #include <linux/err.h>
13 #define UID_GID_MAP_MAX_EXTENTS 5
15 struct uid_gid_map
{ /* 64 bytes -- 1 cache line */
17 struct uid_gid_extent
{
21 } extent
[UID_GID_MAP_MAX_EXTENTS
];
24 #define USERNS_SETGROUPS_ALLOWED 1UL
26 #define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED
31 UCOUNT_USER_NAMESPACES
,
32 UCOUNT_PID_NAMESPACES
,
33 UCOUNT_UTS_NAMESPACES
,
34 UCOUNT_IPC_NAMESPACES
,
35 UCOUNT_NET_NAMESPACES
,
36 UCOUNT_MNT_NAMESPACES
,
37 UCOUNT_CGROUP_NAMESPACES
,
38 #ifdef CONFIG_INOTIFY_USER
39 UCOUNT_INOTIFY_INSTANCES
,
40 UCOUNT_INOTIFY_WATCHES
,
45 struct user_namespace
{
46 struct uid_gid_map uid_map
;
47 struct uid_gid_map gid_map
;
48 struct uid_gid_map projid_map
;
50 struct user_namespace
*parent
;
57 /* Register of per-UID persistent keyrings for this namespace */
58 #ifdef CONFIG_PERSISTENT_KEYRINGS
59 struct key
*persistent_keyring_register
;
60 struct rw_semaphore persistent_keyring_register_sem
;
62 struct work_struct work
;
64 struct ctl_table_set set
;
65 struct ctl_table_header
*sysctls
;
67 struct ucounts
*ucounts
;
68 int ucount_max
[UCOUNT_COUNTS
];
72 struct hlist_node node
;
73 struct user_namespace
*ns
;
76 atomic_t ucount
[UCOUNT_COUNTS
];
79 extern struct user_namespace init_user_ns
;
81 bool setup_userns_sysctls(struct user_namespace
*ns
);
82 void retire_userns_sysctls(struct user_namespace
*ns
);
83 struct ucounts
*inc_ucount(struct user_namespace
*ns
, kuid_t uid
, enum ucount_type type
);
84 void dec_ucount(struct ucounts
*ucounts
, enum ucount_type type
);
88 static inline struct user_namespace
*get_user_ns(struct user_namespace
*ns
)
91 atomic_inc(&ns
->count
);
95 extern int create_user_ns(struct cred
*new);
96 extern int unshare_userns(unsigned long unshare_flags
, struct cred
**new_cred
);
97 extern void __put_user_ns(struct user_namespace
*ns
);
99 static inline void put_user_ns(struct user_namespace
*ns
)
101 if (ns
&& atomic_dec_and_test(&ns
->count
))
105 struct seq_operations
;
106 extern const struct seq_operations proc_uid_seq_operations
;
107 extern const struct seq_operations proc_gid_seq_operations
;
108 extern const struct seq_operations proc_projid_seq_operations
;
109 extern ssize_t
proc_uid_map_write(struct file
*, const char __user
*, size_t, loff_t
*);
110 extern ssize_t
proc_gid_map_write(struct file
*, const char __user
*, size_t, loff_t
*);
111 extern ssize_t
proc_projid_map_write(struct file
*, const char __user
*, size_t, loff_t
*);
112 extern ssize_t
proc_setgroups_write(struct file
*, const char __user
*, size_t, loff_t
*);
113 extern int proc_setgroups_show(struct seq_file
*m
, void *v
);
114 extern bool userns_may_setgroups(const struct user_namespace
*ns
);
115 extern bool current_in_userns(const struct user_namespace
*target_ns
);
117 struct ns_common
*ns_get_owner(struct ns_common
*ns
);
120 static inline struct user_namespace
*get_user_ns(struct user_namespace
*ns
)
122 return &init_user_ns
;
125 static inline int create_user_ns(struct cred
*new)
130 static inline int unshare_userns(unsigned long unshare_flags
,
131 struct cred
**new_cred
)
133 if (unshare_flags
& CLONE_NEWUSER
)
138 static inline void put_user_ns(struct user_namespace
*ns
)
142 static inline bool userns_may_setgroups(const struct user_namespace
*ns
)
147 static inline bool current_in_userns(const struct user_namespace
*target_ns
)
152 static inline struct ns_common
*ns_get_owner(struct ns_common
*ns
)
154 return ERR_PTR(-EPERM
);
158 #endif /* _LINUX_USER_H */