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gerrit-public.fairphone.software / kernel / msm-4.19 / 0fbce76eff0e7ea92f51b253c504a79d9b3b5769 / . / include / linux / user_namespace.h
blob: b9bd2e6c73ccb51ec8f4fadec473d64bcb689fea [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;
Eric W. Biederman98f842e2011-06-15 10:21:48 -0700[diff] [blame]28 unsigned int proc_inum;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]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
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]42extern int create_user_ns(struct cred *new);
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]43extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]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
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]52struct seq_operations;
53extern struct seq_operations proc_uid_seq_operations;
54extern struct seq_operations proc_gid_seq_operations;
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]55extern struct seq_operations proc_projid_seq_operations;
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]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 *);
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]58extern 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]59#else
60
61static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
62{
63 return &init_user_ns;
64}
65
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]66static inline int create_user_ns(struct cred *new)
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]67{
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]68 return -EINVAL;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]69}
70
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]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
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]79static inline void put_user_ns(struct user_namespace *ns)
80{
81}
82
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]83#endif
84
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]85#endif /* _LINUX_USER_H */