Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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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 struct kref kref;
25 struct user_namespace *parent;
26 kuid_t owner;
27 kgid_t group;
28 unsigned int proc_inum;
29};
30
31extern struct user_namespace init_user_ns;
32
33#ifdef CONFIG_USER_NS
34
35static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
36{
37 if (ns)
38 kref_get(&ns->kref);
39 return ns;
40}
41
42extern int create_user_ns(struct cred *new);
43extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
44extern void free_user_ns(struct kref *kref);
45
46static inline void put_user_ns(struct user_namespace *ns)
47{
48 if (ns)
49 kref_put(&ns->kref, free_user_ns);
50}
51
52struct seq_operations;
53extern struct seq_operations proc_uid_seq_operations;
54extern struct seq_operations proc_gid_seq_operations;
55extern struct seq_operations proc_projid_seq_operations;
56extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
57extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
58extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
59#else
60
61static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
62{
63 return &init_user_ns;
64}
65
66static inline int create_user_ns(struct cred *new)
67{
68 return -EINVAL;
69}
70
71static inline int unshare_userns(unsigned long unshare_flags,
72 struct cred **new_cred)
73{
74 if (unshare_flags & CLONE_NEWUSER)
75 return -EINVAL;
76 return 0;
77}
78
79static inline void put_user_ns(struct user_namespace *ns)
80{
81}
82
83#endif
84
85#endif /* _LINUX_USER_H */