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gerrit-public.fairphone.software / kernel / msm-4.19 / e34fae7841b12d77f2621bd28fd41929879ef951 / . / include / linux / user_namespace.h
blob: b6b215f13b453091ff2be0fae11b37a5a51c0c84 [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;
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;
Eric W. Biederman87a8ebd2013-03-24 14:28:27 -0700[diff] [blame]29 bool may_mount_sysfs;
30 bool may_mount_proc;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]31};
32
33extern struct user_namespace init_user_ns;
34
35#ifdef CONFIG_USER_NS
36
37static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
38{
39 if (ns)
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]40 atomic_inc(&ns->count);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]41 return ns;
42}
43
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]44extern int create_user_ns(struct cred *new);
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]45extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]46extern void free_user_ns(struct user_namespace *ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]47
48static inline void put_user_ns(struct user_namespace *ns)
49{
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]50 if (ns && atomic_dec_and_test(&ns->count))
51 free_user_ns(ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]52}
53
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]54struct seq_operations;
55extern struct seq_operations proc_uid_seq_operations;
56extern struct seq_operations proc_gid_seq_operations;
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]57extern struct seq_operations proc_projid_seq_operations;
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]58extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
59extern 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]60extern 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]61#else
62
63static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
64{
65 return &init_user_ns;
66}
67
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]68static inline int create_user_ns(struct cred *new)
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]69{
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]70 return -EINVAL;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]71}
72
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]73static inline int unshare_userns(unsigned long unshare_flags,
74 struct cred **new_cred)
75{
76 if (unshare_flags & CLONE_NEWUSER)
77 return -EINVAL;
78 return 0;
79}
80
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]81static inline void put_user_ns(struct user_namespace *ns)
82{
83}
84
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]85#endif
86
Eric W. Biederman87a8ebd2013-03-24 14:28:27 -0700[diff] [blame]87void update_mnt_policy(struct user_namespace *userns);
88
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]89#endif /* _LINUX_USER_H */