Linaro Git Browser
Code Review Sign In
review.linaro.org / kernel / linux-linaro-stable.git / 5163bb7b0353fa83b8f85a2d7c0ddd348fb9514d / . / include / linux / user_namespace.h
blob: a37081cf59da637dd6b8d81ead7073485c475d73 [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
Eric W. Biederman1c587ee2014-12-02 12:27:26 -0600[diff] [blame]20#define USERNS_SETGROUPS_ALLOWED 1UL
21
22#define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED
23
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]24struct user_namespace {
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]25 struct uid_gid_map uid_map;
26 struct uid_gid_map gid_map;
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]27 struct uid_gid_map projid_map;
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]28 atomic_t count;
Eric W. Biedermanaeb3ae92011-11-16 21:59:43 -0800[diff] [blame]29 struct user_namespace *parent;
Oleg Nesterov5c5f9cd2013-08-08 18:55:32 +0200[diff] [blame]30 int level;
Eric W. Biederman783291e2011-11-17 01:32:59 -0800[diff] [blame]31 kuid_t owner;
32 kgid_t group;
Eric W. Biederman98f842e2011-06-15 10:21:48 -0700[diff] [blame]33 unsigned int proc_inum;
Eric W. Biederman1c587ee2014-12-02 12:27:26 -0600[diff] [blame]34 unsigned long flags;
Eric W. Biederman87a8ebd2013-03-24 14:28:27 -0700[diff] [blame]35 bool may_mount_sysfs;
36 bool may_mount_proc;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]37};
38
39extern struct user_namespace init_user_ns;
40
41#ifdef CONFIG_USER_NS
42
43static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
44{
45 if (ns)
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]46 atomic_inc(&ns->count);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]47 return ns;
48}
49
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]50extern int create_user_ns(struct cred *new);
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]51extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]52extern void free_user_ns(struct user_namespace *ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]53
54static inline void put_user_ns(struct user_namespace *ns)
55{
Eric W. Biedermanc61a2812012-12-28 18:58:39 -0800[diff] [blame]56 if (ns && atomic_dec_and_test(&ns->count))
57 free_user_ns(ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]58}
59
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]60struct seq_operations;
61extern struct seq_operations proc_uid_seq_operations;
62extern struct seq_operations proc_gid_seq_operations;
Eric W. Biedermanf76d2072012-08-30 01:24:05 -0700[diff] [blame]63extern struct seq_operations proc_projid_seq_operations;
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]64extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
65extern 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]66extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
Eric W. Biederman1c587ee2014-12-02 12:27:26 -0600[diff] [blame]67extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *);
68extern int proc_setgroups_show(struct seq_file *m, void *v);
Eric W. Biedermanfc9b65e2014-12-05 18:01:11 -0600[diff] [blame]69extern bool userns_may_setgroups(const struct user_namespace *ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]70#else
71
72static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
73{
74 return &init_user_ns;
75}
76
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]77static inline int create_user_ns(struct cred *new)
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]78{
Serge Hallyn18b6e042008-10-15 16:38:45 -0500[diff] [blame]79 return -EINVAL;
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]80}
81
Eric W. Biedermanb2e0d9872012-07-26 05:15:35 -0700[diff] [blame]82static inline int unshare_userns(unsigned long unshare_flags,
83 struct cred **new_cred)
84{
85 if (unshare_flags & CLONE_NEWUSER)
86 return -EINVAL;
87 return 0;
88}
89
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]90static inline void put_user_ns(struct user_namespace *ns)
91{
92}
93
Eric W. Biedermanfc9b65e2014-12-05 18:01:11 -0600[diff] [blame]94static inline bool userns_may_setgroups(const struct user_namespace *ns)
95{
96 return true;
97}
Eric W. Biederman22d917d2011-11-17 00:11:58 -0800[diff] [blame]98#endif
99
Eric W. Biederman87a8ebd2013-03-24 14:28:27 -0700[diff] [blame]100void update_mnt_policy(struct user_namespace *userns);
101
Cedric Le Goateracce2922007-07-15 23:40:59 -0700[diff] [blame]102#endif /* _LINUX_USER_H */