1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _LINUX_UTSNAME_H 3#define _LINUX_UTSNAME_H 4 5 6#include <linux/sched.h> 7#include <linux/nsproxy.h> 8#include <linux/ns_common.h> 9#include <linux/err.h> 10#include <uapi/linux/utsname.h> 11 12enum uts_proc { 13 UTS_PROC_ARCH, 14 UTS_PROC_OSTYPE, 15 UTS_PROC_OSRELEASE, 16 UTS_PROC_VERSION, 17 UTS_PROC_HOSTNAME, 18 UTS_PROC_DOMAINNAME, 19}; 20 21struct user_namespace; 22extern struct user_namespace init_user_ns; 23 24struct uts_namespace { 25 struct new_utsname name; 26 struct user_namespace *user_ns; 27 struct ucounts *ucounts; 28 struct ns_common ns; 29} __randomize_layout; 30extern struct uts_namespace init_uts_ns; 31 32#ifdef CONFIG_UTS_NS 33static inline void get_uts_ns(struct uts_namespace *ns) 34{ 35 refcount_inc(&ns->ns.count); 36} 37 38extern struct uts_namespace *copy_utsname(unsigned long flags, 39 struct user_namespace *user_ns, struct uts_namespace *old_ns); 40extern void free_uts_ns(struct uts_namespace *ns); 41 42static inline void put_uts_ns(struct uts_namespace *ns) 43{ 44 if (refcount_dec_and_test(&ns->ns.count)) 45 free_uts_ns(ns); 46} 47 48void uts_ns_init(void); 49#else 50static inline void get_uts_ns(struct uts_namespace *ns) 51{ 52} 53 54static inline void put_uts_ns(struct uts_namespace *ns) 55{ 56} 57 58static inline struct uts_namespace *copy_utsname(unsigned long flags, 59 struct user_namespace *user_ns, struct uts_namespace *old_ns) 60{ 61 if (flags & CLONE_NEWUTS) 62 return ERR_PTR(-EINVAL); 63 64 return old_ns; 65} 66 67static inline void uts_ns_init(void) 68{ 69} 70#endif 71 72#ifdef CONFIG_PROC_SYSCTL 73extern void uts_proc_notify(enum uts_proc proc); 74#else 75static inline void uts_proc_notify(enum uts_proc proc) 76{ 77} 78#endif 79 80static inline struct new_utsname *utsname(void) 81{ 82 return ¤t->nsproxy->uts_ns->name; 83} 84 85static inline struct new_utsname *init_utsname(void) 86{ 87 return &init_uts_ns.name; 88} 89 90extern struct rw_semaphore uts_sem; 91 92#endif /* _LINUX_UTSNAME_H */ 93