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 kref kref;
24 struct user_namespace *parent;
25 kuid_t owner;
26 kgid_t group;
27};
28
29extern struct user_namespace init_user_ns;
30
31#ifdef CONFIG_USER_NS
32
33static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
34{
35 if (ns)
36 kref_get(&ns->kref);
37 return ns;
38}
39
40extern int create_user_ns(struct cred *new);
41extern void free_user_ns(struct kref *kref);
42
43static inline void put_user_ns(struct user_namespace *ns)
44{
45 if (ns)
46 kref_put(&ns->kref, free_user_ns);
47}
48
49struct seq_operations;
50extern struct seq_operations proc_uid_seq_operations;
51extern struct seq_operations proc_gid_seq_operations;
52extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
53extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
54#else
55
56static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
57{
58 return &init_user_ns;
59}
60
61static inline int create_user_ns(struct cred *new)
62{
63 return -EINVAL;
64}
65
66static inline void put_user_ns(struct user_namespace *ns)
67{
68}
69
70#endif
71
72#endif /* _LINUX_USER_H */