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/rwsem.h>
9 #include <linux/sysctl.h>
10 #include <linux/err.h>
12 #define UID_GID_MAP_MAX_EXTENTS 5
14 struct uid_gid_map { /* 64 bytes -- 1 cache line */
16 struct uid_gid_extent {
20 } extent[UID_GID_MAP_MAX_EXTENTS];
23 #define USERNS_SETGROUPS_ALLOWED 1UL
25 #define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED
30 UCOUNT_USER_NAMESPACES,
31 UCOUNT_PID_NAMESPACES,
32 UCOUNT_UTS_NAMESPACES,
33 UCOUNT_IPC_NAMESPACES,
34 UCOUNT_NET_NAMESPACES,
35 UCOUNT_MNT_NAMESPACES,
36 UCOUNT_CGROUP_NAMESPACES,
37 #ifdef CONFIG_INOTIFY_USER
38 UCOUNT_INOTIFY_INSTANCES,
39 UCOUNT_INOTIFY_WATCHES,
44 struct user_namespace {
45 struct uid_gid_map uid_map;
46 struct uid_gid_map gid_map;
47 struct uid_gid_map projid_map;
49 struct user_namespace *parent;
56 /* Register of per-UID persistent keyrings for this namespace */
57 #ifdef CONFIG_PERSISTENT_KEYRINGS
58 struct key *persistent_keyring_register;
59 struct rw_semaphore persistent_keyring_register_sem;
61 struct work_struct work;
63 struct ctl_table_set set;
64 struct ctl_table_header *sysctls;
66 struct ucounts *ucounts;
67 int ucount_max[UCOUNT_COUNTS];
71 struct hlist_node node;
72 struct user_namespace *ns;
75 atomic_t ucount[UCOUNT_COUNTS];
78 extern struct user_namespace init_user_ns;
80 bool setup_userns_sysctls(struct user_namespace *ns);
81 void retire_userns_sysctls(struct user_namespace *ns);
82 struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid, enum ucount_type type);
83 void dec_ucount(struct ucounts *ucounts, enum ucount_type type);
87 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
90 atomic_inc(&ns->count);
94 extern int create_user_ns(struct cred *new);
95 extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
96 extern void __put_user_ns(struct user_namespace *ns);
98 static inline void put_user_ns(struct user_namespace *ns)
100 if (ns && atomic_dec_and_test(&ns->count))
104 struct seq_operations;
105 extern const struct seq_operations proc_uid_seq_operations;
106 extern const struct seq_operations proc_gid_seq_operations;
107 extern const struct seq_operations proc_projid_seq_operations;
108 extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
109 extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
110 extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
111 extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *);
112 extern int proc_setgroups_show(struct seq_file *m, void *v);
113 extern bool userns_may_setgroups(const struct user_namespace *ns);
114 extern bool current_in_userns(const struct user_namespace *target_ns);
116 struct ns_common *ns_get_owner(struct ns_common *ns);
119 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
121 return &init_user_ns;
124 static inline int create_user_ns(struct cred *new)
129 static inline int unshare_userns(unsigned long unshare_flags,
130 struct cred **new_cred)
132 if (unshare_flags & CLONE_NEWUSER)
137 static inline void put_user_ns(struct user_namespace *ns)
141 static inline bool userns_may_setgroups(const struct user_namespace *ns)
146 static inline bool current_in_userns(const struct user_namespace *target_ns)
151 static inline struct ns_common *ns_get_owner(struct ns_common *ns)
153 return ERR_PTR(-EPERM);
157 #endif /* _LINUX_USER_H */