Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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};
29
30extern struct user_namespace init_user_ns;
31
32#ifdef CONFIG_USER_NS
33
34static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
35{
36 if (ns)
37 kref_get(&ns->kref);
38 return ns;
39}
40
41extern int create_user_ns(struct cred *new);
42extern void free_user_ns(struct kref *kref);
43
44static inline void put_user_ns(struct user_namespace *ns)
45{
46 if (ns)
47 kref_put(&ns->kref, free_user_ns);
48}
49
50struct seq_operations;
51extern struct seq_operations proc_uid_seq_operations;
52extern struct seq_operations proc_gid_seq_operations;
53extern struct seq_operations proc_projid_seq_operations;
54extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
55extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
56extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
57#else
58
59static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
60{
61 return &init_user_ns;
62}
63
64static inline int create_user_ns(struct cred *new)
65{
66 return -EINVAL;
67}
68
69static inline void put_user_ns(struct user_namespace *ns)
70{
71}
72
73#endif
74
75#endif /* _LINUX_USER_H */