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>
10 #define UID_GID_MAP_MAX_EXTENTS 5
12 struct uid_gid_map { /* 64 bytes -- 1 cache line */
14 struct uid_gid_extent {
18 } extent[UID_GID_MAP_MAX_EXTENTS];
21 #define USERNS_SETGROUPS_ALLOWED 1UL
23 #define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED
28 UCOUNT_USER_NAMESPACES,
29 UCOUNT_PID_NAMESPACES,
30 UCOUNT_UTS_NAMESPACES,
31 UCOUNT_IPC_NAMESPACES,
32 UCOUNT_NET_NAMESPACES,
33 UCOUNT_MNT_NAMESPACES,
34 UCOUNT_CGROUP_NAMESPACES,
35 #ifdef CONFIG_INOTIFY_USER
36 UCOUNT_INOTIFY_INSTANCES,
37 UCOUNT_INOTIFY_WATCHES,
42 struct user_namespace {
43 struct uid_gid_map uid_map;
44 struct uid_gid_map gid_map;
45 struct uid_gid_map projid_map;
47 struct user_namespace *parent;
54 /* Register of per-UID persistent keyrings for this namespace */
55 #ifdef CONFIG_PERSISTENT_KEYRINGS
56 struct key *persistent_keyring_register;
57 struct rw_semaphore persistent_keyring_register_sem;
59 struct work_struct work;
61 struct ctl_table_set set;
62 struct ctl_table_header *sysctls;
64 struct ucounts *ucounts;
65 int ucount_max[UCOUNT_COUNTS];
69 struct hlist_node node;
70 struct user_namespace *ns;
73 atomic_t ucount[UCOUNT_COUNTS];
76 extern struct user_namespace init_user_ns;
78 bool setup_userns_sysctls(struct user_namespace *ns);
79 void retire_userns_sysctls(struct user_namespace *ns);
80 struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid, enum ucount_type type);
81 void dec_ucount(struct ucounts *ucounts, enum ucount_type type);
85 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
88 atomic_inc(&ns->count);
92 extern int create_user_ns(struct cred *new);
93 extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
94 extern void __put_user_ns(struct user_namespace *ns);
96 static inline void put_user_ns(struct user_namespace *ns)
98 if (ns && atomic_dec_and_test(&ns->count))
102 struct seq_operations;
103 extern const struct seq_operations proc_uid_seq_operations;
104 extern const struct seq_operations proc_gid_seq_operations;
105 extern const struct seq_operations proc_projid_seq_operations;
106 extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
107 extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
108 extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
109 extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *);
110 extern int proc_setgroups_show(struct seq_file *m, void *v);
111 extern bool userns_may_setgroups(const struct user_namespace *ns);
112 extern bool current_in_userns(const struct user_namespace *target_ns);
114 struct ns_common *ns_get_owner(struct ns_common *ns);
117 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
119 return &init_user_ns;
122 static inline int create_user_ns(struct cred *new)
127 static inline int unshare_userns(unsigned long unshare_flags,
128 struct cred **new_cred)
130 if (unshare_flags & CLONE_NEWUSER)
135 static inline void put_user_ns(struct user_namespace *ns)
139 static inline bool userns_may_setgroups(const struct user_namespace *ns)
144 static inline bool current_in_userns(const struct user_namespace *target_ns)
149 static inline struct ns_common *ns_get_owner(struct ns_common *ns)
151 return ERR_PTR(-EPERM);
155 #endif /* _LINUX_USER_H */