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,
38 struct user_namespace {
39 struct uid_gid_map uid_map;
40 struct uid_gid_map gid_map;
41 struct uid_gid_map projid_map;
43 struct user_namespace *parent;
50 /* Register of per-UID persistent keyrings for this namespace */
51 #ifdef CONFIG_PERSISTENT_KEYRINGS
52 struct key *persistent_keyring_register;
53 struct rw_semaphore persistent_keyring_register_sem;
55 struct work_struct work;
57 struct ctl_table_set set;
58 struct ctl_table_header *sysctls;
60 struct ucounts *ucounts;
61 int ucount_max[UCOUNT_COUNTS];
65 struct hlist_node node;
66 struct user_namespace *ns;
69 atomic_t ucount[UCOUNT_COUNTS];
72 extern struct user_namespace init_user_ns;
74 bool setup_userns_sysctls(struct user_namespace *ns);
75 void retire_userns_sysctls(struct user_namespace *ns);
76 struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid, enum ucount_type type);
77 void dec_ucount(struct ucounts *ucounts, enum ucount_type type);
81 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
84 atomic_inc(&ns->count);
88 extern int create_user_ns(struct cred *new);
89 extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
90 extern void __put_user_ns(struct user_namespace *ns);
92 static inline void put_user_ns(struct user_namespace *ns)
94 if (ns && atomic_dec_and_test(&ns->count))
98 struct seq_operations;
99 extern const struct seq_operations proc_uid_seq_operations;
100 extern const struct seq_operations proc_gid_seq_operations;
101 extern const struct seq_operations proc_projid_seq_operations;
102 extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
103 extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
104 extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
105 extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *);
106 extern int proc_setgroups_show(struct seq_file *m, void *v);
107 extern bool userns_may_setgroups(const struct user_namespace *ns);
108 extern bool current_in_userns(const struct user_namespace *target_ns);
110 struct ns_common *ns_get_owner(struct ns_common *ns);
113 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
115 return &init_user_ns;
118 static inline int create_user_ns(struct cred *new)
123 static inline int unshare_userns(unsigned long unshare_flags,
124 struct cred **new_cred)
126 if (unshare_flags & CLONE_NEWUSER)
131 static inline void put_user_ns(struct user_namespace *ns)
135 static inline bool userns_may_setgroups(const struct user_namespace *ns)
140 static inline bool current_in_userns(const struct user_namespace *target_ns)
145 static inline struct ns_common *ns_get_owner(struct ns_common *ns)
147 return ERR_PTR(-EPERM);
151 #endif /* _LINUX_USER_H */