diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/init_task.h | 2 | ||||
| -rw-r--r-- | include/linux/nsproxy.h | 1 | ||||
| -rw-r--r-- | include/linux/sched.h | 3 | ||||
| -rw-r--r-- | include/linux/user_namespace.h | 57 |
4 files changed, 62 insertions, 1 deletions
diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 276ccaa2670c..cab741c2d603 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -8,6 +8,7 @@ #include <linux/lockdep.h> #include <linux/ipc.h> #include <linux/pid_namespace.h> +#include <linux/user_namespace.h> #define INIT_FDTABLE \ { \ @@ -78,6 +79,7 @@ extern struct nsproxy init_nsproxy; .uts_ns = &init_uts_ns, \ .mnt_ns = NULL, \ INIT_IPC_NS(ipc_ns) \ + .user_ns = &init_user_ns, \ } #define INIT_SIGHAND(sighand) { \ diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h index 189e0dc993ab..6d179a397bfb 100644 --- a/include/linux/nsproxy.h +++ b/include/linux/nsproxy.h @@ -28,6 +28,7 @@ struct nsproxy { struct ipc_namespace *ipc_ns; struct mnt_namespace *mnt_ns; struct pid_namespace *pid_ns; + struct user_namespace *user_ns; }; extern struct nsproxy init_nsproxy; diff --git a/include/linux/sched.h b/include/linux/sched.h index b579624477f4..c667255d70db 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -287,6 +287,7 @@ extern signed long schedule_timeout_uninterruptible(signed long timeout); asmlinkage void schedule(void); struct nsproxy; +struct user_namespace; /* Maximum number of active map areas.. This is a random (large) number */ #define DEFAULT_MAX_MAP_COUNT 65536 @@ -1408,7 +1409,7 @@ extern struct task_struct *find_task_by_pid_type(int type, int pid); extern void __set_special_pids(pid_t session, pid_t pgrp); /* per-UID process charging. */ -extern struct user_struct * alloc_uid(uid_t); +extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); static inline struct user_struct *get_uid(struct user_struct *u) { atomic_inc(&u->__count); diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h new file mode 100644 index 000000000000..92a45867ecfb --- /dev/null +++ b/include/linux/user_namespace.h @@ -0,0 +1,57 @@ +#ifndef _LINUX_USER_NAMESPACE_H +#define _LINUX_USER_NAMESPACE_H + +#include <linux/kref.h> +#include <linux/nsproxy.h> +#include <linux/sched.h> + +#define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 8) +#define UIDHASH_SZ (1 << UIDHASH_BITS) + +struct user_namespace { + struct kref kref; + struct list_head uidhash_table[UIDHASH_SZ]; + struct user_struct *root_user; +}; + +extern struct user_namespace init_user_ns; + +#ifdef CONFIG_USER_NS + +static inline struct user_namespace *get_user_ns(struct user_namespace *ns) +{ + if (ns) + kref_get(&ns->kref); + return ns; +} + +extern struct user_namespace *copy_user_ns(int flags, + struct user_namespace *old_ns); +extern void free_user_ns(struct kref *kref); + +static inline void put_user_ns(struct user_namespace *ns) +{ + if (ns) + kref_put(&ns->kref, free_user_ns); +} + +#else + +static inline struct user_namespace *get_user_ns(struct user_namespace *ns) +{ + return &init_user_ns; +} + +static inline struct user_namespace *copy_user_ns(int flags, + struct user_namespace *old_ns) +{ + return NULL; +} + +static inline void put_user_ns(struct user_namespace *ns) +{ +} + +#endif + +#endif /* _LINUX_USER_H */ |