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
25 struct user_namespace {
26 struct uid_gid_map uid_map;
27 struct uid_gid_map gid_map;
28 struct uid_gid_map projid_map;
30 struct user_namespace *parent;
37 /* Register of per-UID persistent keyrings for this namespace */
38 #ifdef CONFIG_PERSISTENT_KEYRINGS
39 struct key *persistent_keyring_register;
40 struct rw_semaphore persistent_keyring_register_sem;
44 extern struct user_namespace init_user_ns;
48 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
51 atomic_inc(&ns->count);
55 extern int create_user_ns(struct cred *new);
56 extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
57 extern void free_user_ns(struct user_namespace *ns);
59 static inline void put_user_ns(struct user_namespace *ns)
61 if (ns && atomic_dec_and_test(&ns->count))
65 struct seq_operations;
66 extern const struct seq_operations proc_uid_seq_operations;
67 extern const struct seq_operations proc_gid_seq_operations;
68 extern const struct seq_operations proc_projid_seq_operations;
69 extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
70 extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
71 extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
72 extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *);
73 extern int proc_setgroups_show(struct seq_file *m, void *v);
74 extern bool userns_may_setgroups(const struct user_namespace *ns);
75 extern bool current_in_userns(const struct user_namespace *target_ns);
78 static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
83 static inline int create_user_ns(struct cred *new)
88 static inline int unshare_userns(unsigned long unshare_flags,
89 struct cred **new_cred)
91 if (unshare_flags & CLONE_NEWUSER)
96 static inline void put_user_ns(struct user_namespace *ns)
100 static inline bool userns_may_setgroups(const struct user_namespace *ns)
105 static inline bool current_in_userns(const struct user_namespace *target_ns)
111 #endif /* _LINUX_USER_H */