Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _LINUX_USER_NAMESPACE_H
2#define _LINUX_USER_NAMESPACE_H
3
4#include <linux/kref.h>
5#include <linux/nsproxy.h>
6#include <linux/sched.h>
7#include <linux/err.h>
8
9#define UID_GID_MAP_MAX_EXTENTS 5
10
11struct uid_gid_map { /* 64 bytes -- 1 cache line */
12 u32 nr_extents;
13 struct uid_gid_extent {
14 u32 first;
15 u32 lower_first;
16 u32 count;
17 } extent[UID_GID_MAP_MAX_EXTENTS];
18};
19
20struct user_namespace {
21 struct uid_gid_map uid_map;
22 struct uid_gid_map gid_map;
23 struct uid_gid_map projid_map;
24 atomic_t count;
25 struct user_namespace *parent;
26 kuid_t owner;
27 kgid_t group;
28 unsigned int proc_inum;
29 bool may_mount_sysfs;
30 bool may_mount_proc;
31};
32
33extern struct user_namespace init_user_ns;
34
35#ifdef CONFIG_USER_NS
36
37static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
38{
39 if (ns)
40 atomic_inc(&ns->count);
41 return ns;
42}
43
44extern int create_user_ns(struct cred *new);
45extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
46extern void free_user_ns(struct user_namespace *ns);
47
48static inline void put_user_ns(struct user_namespace *ns)
49{
50 if (ns && atomic_dec_and_test(&ns->count))
51 free_user_ns(ns);
52}
53
54struct seq_operations;
55extern struct seq_operations proc_uid_seq_operations;
56extern struct seq_operations proc_gid_seq_operations;
57extern struct seq_operations proc_projid_seq_operations;
58extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
59extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
60extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
61#else
62
63static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
64{
65 return &init_user_ns;
66}
67
68static inline int create_user_ns(struct cred *new)
69{
70 return -EINVAL;
71}
72
73static inline int unshare_userns(unsigned long unshare_flags,
74 struct cred **new_cred)
75{
76 if (unshare_flags & CLONE_NEWUSER)
77 return -EINVAL;
78 return 0;
79}
80
81static inline void put_user_ns(struct user_namespace *ns)
82{
83}
84
85#endif
86
87void update_mnt_policy(struct user_namespace *userns);
88
89#endif /* _LINUX_USER_H */