include/linux/pid_namespace.h

Source file repositories/reference/linux-study-clean/include/linux/pid_namespace.h

File Facts

System
Linux kernel
Corpus path
include/linux/pid_namespace.h
Extension
.h
Size
3659 bytes
Lines
148
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct pid_namespace {
	struct idr idr;
	struct rcu_head rcu;
	unsigned int pid_allocated;
#ifdef CONFIG_SYSCTL
#if defined(CONFIG_MEMFD_CREATE)
	int memfd_noexec_scope;
#endif
	struct ctl_table_set	set;
	struct ctl_table_header *sysctls;
#endif
	struct task_struct *child_reaper;
	struct kmem_cache *pid_cachep;
	unsigned int level;
	int pid_max;
	struct pid_namespace *parent;
#ifdef CONFIG_BSD_PROCESS_ACCT
	struct fs_pin *bacct;
#endif
	struct user_namespace *user_ns;
	struct ucounts *ucounts;
	int reboot;	/* group exit code if this pidns was rebooted */
	struct ns_common ns;
	struct work_struct	work;
} __randomize_layout;

extern struct pid_namespace init_pid_ns;

#define PIDNS_ADDING (1U << 31)

#ifdef CONFIG_PID_NS
static inline struct pid_namespace *to_pid_ns(struct ns_common *ns)
{
	return container_of(ns, struct pid_namespace, ns);
}

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

#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
{
	int scope = MEMFD_NOEXEC_SCOPE_EXEC;

	for (; ns; ns = ns->parent)
		scope = max(scope, READ_ONCE(ns->memfd_noexec_scope));

	return scope;
}
#else
static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
{
	return 0;
}
#endif

extern struct pid_namespace *copy_pid_ns(u64 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);

extern bool pidns_is_ancestor(struct pid_namespace *child,
			      struct pid_namespace *ancestor);

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

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

static inline int pidns_memfd_noexec_scope(struct pid_namespace *ns)
{
	return 0;
}

static inline struct pid_namespace *copy_pid_ns(u64 flags,
	struct user_namespace *user_ns, struct pid_namespace *ns)
{
	if (flags & CLONE_NEWPID)
		ns = ERR_PTR(-EINVAL);
	return ns;
}

static inline void put_pid_ns(struct pid_namespace *ns)

Annotation

Implementation Notes