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gerrit-public.fairphone.software / kernel / msm-4.9 / c9af5b76ef9e494a07a8baa6998fd6a5d497f35c / . / include / linux / user_namespace.h
blob: 95142cae446a7205e9887029a7433eff1b147d81 [file] [log] [blame]
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]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>
Serge E. Hallyn77ec7392007-07-15 23:41:01 -0700[diff] [blame]7#include <linux/err.h>
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]8
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]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
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]20struct user_namespace {
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]21 struct uid_gid_map uid_map;
22 struct uid_gid_map gid_map;
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]23 struct uid_gid_map projid_map;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]24 struct kref kref;
Eric W. Biedermanaeb3ae92011-11-16 21:59:43 -0800[diff] [blame]25 struct user_namespace *parent;
Eric W. Biederman783291e2011-11-17 01:32:59 -0800[diff] [blame]26 kuid_t owner;
27 kgid_t group;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]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
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]41extern int create_user_ns(struct cred *new);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]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
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]50struct seq_operations;
51extern struct seq_operations proc_uid_seq_operations;
52extern struct seq_operations proc_gid_seq_operations;
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]53extern struct seq_operations proc_projid_seq_operations;
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]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 *);
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]56extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]57#else
58
59static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
60{
61 return &init_user_ns;
62}
63
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]64static inline int create_user_ns(struct cred *new)
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]65{
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]66 return -EINVAL;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]67}
68
69static inline void put_user_ns(struct user_namespace *ns)
70{
71}
72
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]73#endif
74
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]75#endif /* _LINUX_USER_H */