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gerrit-public.fairphone.software / kernel / msm-4.9 / 9f16d84ad73ea04145a5dc85c8f1067915b37eea / . / include / linux / user_namespace.h
blob: 4db29859464f3af3d78caafa41a1e7525034a589 [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;
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]24 atomic_t count;
Eric W. Biedermanaeb3ae92011-11-16 21:59:43 -0800[diff] [blame]25 struct user_namespace *parent;
Oleg Nesterov8742f222013-08-08 18:55:32 +0200[diff] [blame]26 int level;
Eric W. Biederman783291e2011-11-17 01:32:59 -0800[diff] [blame]27 kuid_t owner;
28 kgid_t group;
Eric W. Biederman98f842e2011-06-15 10:21:48 -0700[diff] [blame]29 unsigned int proc_inum;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]30};
31
32extern struct user_namespace init_user_ns;
33
34#ifdef CONFIG_USER_NS
35
36static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
37{
38 if (ns)
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]39 atomic_inc(&ns->count);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]40 return ns;
41}
42
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]43extern int create_user_ns(struct cred *new);
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]44extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]45extern void free_user_ns(struct user_namespace *ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]46
47static inline void put_user_ns(struct user_namespace *ns)
48{
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]49 if (ns && atomic_dec_and_test(&ns->count))
50 free_user_ns(ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]51}
52
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]53struct seq_operations;
54extern struct seq_operations proc_uid_seq_operations;
55extern struct seq_operations proc_gid_seq_operations;
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]56extern struct seq_operations proc_projid_seq_operations;
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]57extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
58extern 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]59extern 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]60#else
61
62static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
63{
64 return &init_user_ns;
65}
66
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]67static inline int create_user_ns(struct cred *new)
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]68{
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]69 return -EINVAL;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]70}
71
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]72static inline int unshare_userns(unsigned long unshare_flags,
73 struct cred **new_cred)
74{
75 if (unshare_flags & CLONE_NEWUSER)
76 return -EINVAL;
77 return 0;
78}
79
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]80static inline void put_user_ns(struct user_namespace *ns)
81{
82}
83
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]84#endif
85
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]86#endif /* _LINUX_USER_H */