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gerrit-public.fairphone.software / kernel / msm-4.9 / b5f36d9e614135470da452f820f161c443d3c83c / . / include / linux / user_namespace.h
blob: 4836ba3c1cd8266c294b9dfd28aa6d0d433db0d6 [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;
David Howellsf36f8c72013-09-24 10:35:19 +0100[diff] [blame]30
31 /* Register of per-UID persistent keyrings for this namespace */
32#ifdef CONFIG_PERSISTENT_KEYRINGS
33 struct key *persistent_keyring_register;
34 struct rw_semaphore persistent_keyring_register_sem;
35#endif
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]36};
37
38extern struct user_namespace init_user_ns;
39
40#ifdef CONFIG_USER_NS
41
42static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
43{
44 if (ns)
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]45 atomic_inc(&ns->count);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]46 return ns;
47}
48
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]49extern int create_user_ns(struct cred *new);
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]50extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]51extern void free_user_ns(struct user_namespace *ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]52
53static inline void put_user_ns(struct user_namespace *ns)
54{
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]55 if (ns && atomic_dec_and_test(&ns->count))
56 free_user_ns(ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]57}
58
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]59struct seq_operations;
60extern struct seq_operations proc_uid_seq_operations;
61extern struct seq_operations proc_gid_seq_operations;
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]62extern struct seq_operations proc_projid_seq_operations;
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]63extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
64extern 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]65extern 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]66#else
67
68static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
69{
70 return &init_user_ns;
71}
72
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]73static inline int create_user_ns(struct cred *new)
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]74{
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]75 return -EINVAL;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]76}
77
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]78static inline int unshare_userns(unsigned long unshare_flags,
79 struct cred **new_cred)
80{
81 if (unshare_flags & CLONE_NEWUSER)
82 return -EINVAL;
83 return 0;
84}
85
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]86static inline void put_user_ns(struct user_namespace *ns)
87{
88}
89
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]90#endif
91
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]92#endif /* _LINUX_USER_H */