Release 4.14 include/linux/pid_namespace.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PID_NS_H

#define _LINUX_PID_NS_H

#include <linux/sched.h>
#include <linux/bug.h>
#include <linux/mm.h>
#include <linux/workqueue.h>
#include <linux/threads.h>
#include <linux/nsproxy.h>
#include <linux/kref.h>
#include <linux/ns_common.h>


struct pidmap {
       
atomic_t nr_free;
       
void *page;
};


#define BITS_PER_PAGE		(PAGE_SIZE * 8)

#define BITS_PER_PAGE_MASK	(BITS_PER_PAGE-1)

#define PIDMAP_ENTRIES		((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)

struct fs_pin;

enum { /* definitions for pid_namespace's hide_pid field */
	
HIDEPID_OFF	  = 0,
	
HIDEPID_NO_ACCESS = 1,
	
HIDEPID_INVISIBLE = 2,
};


struct pid_namespace {
	
struct kref kref;
	
struct pidmap pidmap[PIDMAP_ENTRIES];
	
struct rcu_head rcu;
	
int last_pid;
	
unsigned int nr_hashed;
	
struct task_struct *child_reaper;
	
struct kmem_cache *pid_cachep;
	
unsigned int level;
	
struct pid_namespace *parent;
#ifdef CONFIG_PROC_FS
	
struct vfsmount *proc_mnt;
	
struct dentry *proc_self;
	
struct dentry *proc_thread_self;
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
	
struct fs_pin *bacct;
#endif
	
struct user_namespace *user_ns;
	
struct ucounts *ucounts;
	
struct work_struct proc_work;
	
kgid_t pid_gid;
	
int hide_pid;
	
int reboot;	/* group exit code if this pidns was rebooted */
	
struct ns_common ns;

} __randomize_layout;

extern struct pid_namespace init_pid_ns;


#define PIDNS_HASH_ADDING (1U << 31)

#ifdef CONFIG_PID_NS


static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
	if (ns != &init_pid_ns)
		kref_get(&ns->kref);
	return ns;
}

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extern struct pid_namespace *copy_pid_ns(unsigned long flags,
	struct user_namespace *user_ns, struct pid_namespace *ns);
extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
extern void put_pid_ns(struct pid_namespace *ns);

#else /* !CONFIG_PID_NS */
#include <linux/err.h>



static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
	return ns;
}

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static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
	struct user_namespace *user_ns, struct pid_namespace *ns)
{
	if (flags & CLONE_NEWPID)
		ns = ERR_PTR(-EINVAL);
	return ns;
}

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static inline void put_pid_ns(struct pid_namespace *ns)
{
}

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static inline void zap_pid_ns_processes(struct pid_namespace *ns)
{
	BUG();
}

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static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
{
	return 0;
}
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#endif /* CONFIG_PID_NS */

extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
void pidhash_init(void);
void pidmap_init(void);

#endif /* _LINUX_PID_NS_H */
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Directory: include/linux

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