166 lines
4.1 KiB
C
166 lines
4.1 KiB
C
#ifndef _LINUX_USER_NAMESPACE_H
|
|
#define _LINUX_USER_NAMESPACE_H
|
|
|
|
#include <linux/kref.h>
|
|
#include <linux/nsproxy.h>
|
|
#include <linux/ns_common.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/rwsem.h>
|
|
#include <linux/sysctl.h>
|
|
#include <linux/err.h>
|
|
|
|
#define UID_GID_MAP_MAX_EXTENTS 5
|
|
|
|
struct uid_gid_map { /* 64 bytes -- 1 cache line */
|
|
u32 nr_extents;
|
|
struct uid_gid_extent {
|
|
u32 first;
|
|
u32 lower_first;
|
|
u32 count;
|
|
} extent[UID_GID_MAP_MAX_EXTENTS];
|
|
};
|
|
|
|
#define USERNS_SETGROUPS_ALLOWED 1UL
|
|
|
|
#define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED
|
|
|
|
struct ucounts;
|
|
|
|
enum ucount_type {
|
|
UCOUNT_USER_NAMESPACES,
|
|
UCOUNT_PID_NAMESPACES,
|
|
UCOUNT_UTS_NAMESPACES,
|
|
UCOUNT_IPC_NAMESPACES,
|
|
UCOUNT_NET_NAMESPACES,
|
|
UCOUNT_MNT_NAMESPACES,
|
|
UCOUNT_CGROUP_NAMESPACES,
|
|
#ifdef CONFIG_INOTIFY_USER
|
|
UCOUNT_INOTIFY_INSTANCES,
|
|
UCOUNT_INOTIFY_WATCHES,
|
|
#endif
|
|
UCOUNT_COUNTS,
|
|
};
|
|
|
|
struct user_namespace {
|
|
struct uid_gid_map uid_map;
|
|
struct uid_gid_map gid_map;
|
|
struct uid_gid_map projid_map;
|
|
atomic_t count;
|
|
struct user_namespace *parent;
|
|
int level;
|
|
kuid_t owner;
|
|
kgid_t group;
|
|
struct ns_common ns;
|
|
unsigned long flags;
|
|
|
|
/* Register of per-UID persistent keyrings for this namespace */
|
|
#ifdef CONFIG_PERSISTENT_KEYRINGS
|
|
struct key *persistent_keyring_register;
|
|
struct rw_semaphore persistent_keyring_register_sem;
|
|
#endif
|
|
struct work_struct work;
|
|
#ifdef CONFIG_SYSCTL
|
|
struct ctl_table_set set;
|
|
struct ctl_table_header *sysctls;
|
|
#endif
|
|
struct ucounts *ucounts;
|
|
int ucount_max[UCOUNT_COUNTS];
|
|
} __randomize_layout;
|
|
|
|
struct ucounts {
|
|
struct hlist_node node;
|
|
struct user_namespace *ns;
|
|
kuid_t uid;
|
|
int count;
|
|
atomic_t ucount[UCOUNT_COUNTS];
|
|
};
|
|
|
|
extern struct user_namespace init_user_ns;
|
|
|
|
bool setup_userns_sysctls(struct user_namespace *ns);
|
|
void retire_userns_sysctls(struct user_namespace *ns);
|
|
struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid, enum ucount_type type);
|
|
void dec_ucount(struct ucounts *ucounts, enum ucount_type type);
|
|
|
|
#ifdef CONFIG_USER_NS
|
|
|
|
static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
|
|
{
|
|
if (ns)
|
|
atomic_inc(&ns->count);
|
|
return ns;
|
|
}
|
|
|
|
extern int create_user_ns(struct cred *new);
|
|
extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
|
|
extern void __put_user_ns(struct user_namespace *ns);
|
|
|
|
static inline void put_user_ns(struct user_namespace *ns)
|
|
{
|
|
if (ns && atomic_dec_and_test(&ns->count))
|
|
__put_user_ns(ns);
|
|
}
|
|
|
|
struct seq_operations;
|
|
extern const struct seq_operations proc_uid_seq_operations;
|
|
extern const struct seq_operations proc_gid_seq_operations;
|
|
extern const struct seq_operations proc_projid_seq_operations;
|
|
extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
|
|
extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
|
|
extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
|
|
extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t, loff_t *);
|
|
extern int proc_setgroups_show(struct seq_file *m, void *v);
|
|
extern bool userns_may_setgroups(const struct user_namespace *ns);
|
|
extern bool in_userns(const struct user_namespace *ancestor,
|
|
const struct user_namespace *child);
|
|
extern bool current_in_userns(const struct user_namespace *target_ns);
|
|
struct ns_common *ns_get_owner(struct ns_common *ns);
|
|
#else
|
|
|
|
static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
|
|
{
|
|
return &init_user_ns;
|
|
}
|
|
|
|
static inline int create_user_ns(struct cred *new)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int unshare_userns(unsigned long unshare_flags,
|
|
struct cred **new_cred)
|
|
{
|
|
if (unshare_flags & CLONE_NEWUSER)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
static inline void put_user_ns(struct user_namespace *ns)
|
|
{
|
|
}
|
|
|
|
static inline bool userns_may_setgroups(const struct user_namespace *ns)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline bool in_userns(const struct user_namespace *ancestor,
|
|
const struct user_namespace *child)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline bool current_in_userns(const struct user_namespace *target_ns)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline struct ns_common *ns_get_owner(struct ns_common *ns)
|
|
{
|
|
return ERR_PTR(-EPERM);
|
|
}
|
|
#endif
|
|
|
|
#endif /* _LINUX_USER_H */
|