1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _LINUX_PID_NS_H 3#define _LINUX_PID_NS_H 4 5#include <linux/sched.h> 6#include <linux/bug.h> 7#include <linux/mm.h> 8#include <linux/workqueue.h> 9#include <linux/threads.h> 10#include <linux/nsproxy.h> 11#include <linux/ns_common.h> 12#include <linux/idr.h> 13 14/* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */ 15#define MAX_PID_NS_LEVEL 32 16 17struct fs_pin; 18 19#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE) 20/* modes for vm.memfd_noexec sysctl */ 21#define MEMFD_NOEXEC_SCOPE_EXEC 0 /* MFD_EXEC implied if unset */ 22#define MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL 1 /* MFD_NOEXEC_SEAL implied if unset */ 23#define MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED 2 /* same as 1, except MFD_EXEC rejected */ 24#endif 25 26struct pid_namespace { 27 struct idr idr; 28 struct rcu_head rcu; 29 unsigned int pid_allocated; 30 struct task_struct *child_reaper; 31 struct kmem_cache *pid_cachep; 32 unsigned int level; 33 struct pid_namespace *parent; 34#ifdef CONFIG_BSD_PROCESS_ACCT 35 struct fs_pin *bacct; 36#endif 37 struct user_namespace *user_ns; 38 struct ucounts *ucounts; 39 int reboot; /* group exit code if this pidns was rebooted */ 40 struct ns_common ns; 41#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE) 42 int memfd_noexec_scope; 43#endif 44} __randomize_layout; 45 46extern struct pid_namespace init_pid_ns; 47 48#define PIDNS_ADDING (1U << 31) 49 50#ifdef CONFIG_PID_NS 51static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 52{ 53 if (ns != &init_pid_ns) 54 refcount_inc(&ns->ns.count); 55 return ns; 56} 57 58#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE) 59static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns) 60{ 61 int scope = MEMFD_NOEXEC_SCOPE_EXEC; 62 63 for (; ns; ns = ns->parent) 64 scope = max(scope, READ_ONCE(ns->memfd_noexec_scope)); 65 66 return scope; 67} 68#else 69static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns) 70{ 71 return 0; 72} 73#endif 74 75extern struct pid_namespace *copy_pid_ns(unsigned long flags, 76 struct user_namespace *user_ns, struct pid_namespace *ns); 77extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 78extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 79extern void put_pid_ns(struct pid_namespace *ns); 80 81#else /* !CONFIG_PID_NS */ 82#include <linux/err.h> 83 84static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 85{ 86 return ns; 87} 88 89static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns) 90{ 91 return 0; 92} 93 94static inline struct pid_namespace *copy_pid_ns(unsigned long flags, 95 struct user_namespace *user_ns, struct pid_namespace *ns) 96{ 97 if (flags & CLONE_NEWPID) 98 ns = ERR_PTR(-EINVAL); 99 return ns; 100} 101 102static inline void put_pid_ns(struct pid_namespace *ns) 103{ 104} 105 106static inline void zap_pid_ns_processes(struct pid_namespace *ns) 107{ 108 BUG(); 109} 110 111static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 112{ 113 return 0; 114} 115#endif /* CONFIG_PID_NS */ 116 117extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 118void pidhash_init(void); 119void pid_idr_init(void); 120 121static inline bool task_is_in_init_pid_ns(struct task_struct *tsk) 122{ 123 return task_active_pid_ns(tsk) == &init_pid_ns; 124} 125 126#endif /* _LINUX_PID_NS_H */ 127