[linux.git] / init / init_task.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/init_task.h>
#include <linux/export.h>
#include <linux/mqueue.h>
#include <linux/sched.h>
#include <linux/sched/sysctl.h>
#include <linux/sched/rt.h>
#include <linux/sched/task.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/audit.h>
#include <linux/numa.h>
#include <linux/scs.h>
#include <linux/plist.h>

#include <linux/uaccess.h>

static struct signal_struct init_signals = {
	.nr_threads	= 1,
	.thread_head	= LIST_HEAD_INIT(init_task.thread_node),
	.wait_chldexit	= __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
	.shared_pending	= {
		.list = LIST_HEAD_INIT(init_signals.shared_pending.list),
		.signal =  {{0}}
	},
	.multiprocess	= HLIST_HEAD_INIT,
	.rlim		= INIT_RLIMITS,
	.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
	.exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
#ifdef CONFIG_POSIX_TIMERS
	.posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
	.cputimer	= {
		.cputime_atomic	= INIT_CPUTIME_ATOMIC,
	},
#endif
	INIT_CPU_TIMERS(init_signals)
	.pids = {
		[PIDTYPE_PID]	= &init_struct_pid,
		[PIDTYPE_TGID]	= &init_struct_pid,
		[PIDTYPE_PGID]	= &init_struct_pid,
		[PIDTYPE_SID]	= &init_struct_pid,
	},
	INIT_PREV_CPUTIME(init_signals)
};

static struct sighand_struct init_sighand = {
	.count		= REFCOUNT_INIT(1),
	.action		= { { { .sa_handler = SIG_DFL, } }, },
	.siglock	= __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
	.signalfd_wqh	= __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
};

#ifdef CONFIG_SHADOW_CALL_STACK
unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = {
	[(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC
};
#endif

/*
 * Set up the first task table, touch at your own risk!. Base=0,
 * limit=0x1fffff (=2MB)
 */
struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
#ifdef CONFIG_THREAD_INFO_IN_TASK
	.thread_info	= INIT_THREAD_INFO(init_task),
	.stack_refcount	= REFCOUNT_INIT(1),
#endif
	.__state	= 0,
	.stack		= init_stack,
	.usage		= REFCOUNT_INIT(2),
	.flags		= PF_KTHREAD,
	.prio		= MAX_PRIO - 20,
	.static_prio	= MAX_PRIO - 20,
	.normal_prio	= MAX_PRIO - 20,
	.policy		= SCHED_NORMAL,
	.cpus_ptr	= &init_task.cpus_mask,
	.user_cpus_ptr	= NULL,
	.cpus_mask	= CPU_MASK_ALL,
	.nr_cpus_allowed= NR_CPUS,
	.mm		= NULL,
	.active_mm	= &init_mm,
	.faults_disabled_mapping = NULL,
	.restart_block	= {
		.fn = do_no_restart_syscall,
	},
	.se		= {
		.group_node 	= LIST_HEAD_INIT(init_task.se.group_node),
	},
	.rt		= {
		.run_list	= LIST_HEAD_INIT(init_task.rt.run_list),
		.time_slice	= RR_TIMESLICE,
	},
	.tasks		= LIST_HEAD_INIT(init_task.tasks),
#ifdef CONFIG_SMP
	.pushable_tasks	= PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
#endif
#ifdef CONFIG_CGROUP_SCHED
	.sched_task_group = &root_task_group,
#endif
	.ptraced	= LIST_HEAD_INIT(init_task.ptraced),
	.ptrace_entry	= LIST_HEAD_INIT(init_task.ptrace_entry),
	.real_parent	= &init_task,
	.parent		= &init_task,
	.children	= LIST_HEAD_INIT(init_task.children),
	.sibling	= LIST_HEAD_INIT(init_task.sibling),
	.group_leader	= &init_task,
	RCU_POINTER_INITIALIZER(real_cred, &init_cred),
	RCU_POINTER_INITIALIZER(cred, &init_cred),
	.comm		= INIT_TASK_COMM,
	.thread		= INIT_THREAD,
	.fs		= &init_fs,
	.files		= &init_files,
#ifdef CONFIG_IO_URING
	.io_uring	= NULL,
#endif
	.signal		= &init_signals,
	.sighand	= &init_sighand,
	.nsproxy	= &init_nsproxy,
	.pending	= {
		.list = LIST_HEAD_INIT(init_task.pending.list),
		.signal = {{0}}
	},
	.blocked	= {{0}},
	.alloc_lock	= __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
	.journal_info	= NULL,
	INIT_CPU_TIMERS(init_task)
	.pi_lock	= __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
	.timer_slack_ns = 50000, /* 50 usec default slack */
	.thread_pid	= &init_struct_pid,
	.thread_node	= LIST_HEAD_INIT(init_signals.thread_head),
#ifdef CONFIG_AUDIT
	.loginuid	= INVALID_UID,
	.sessionid	= AUDIT_SID_UNSET,
#endif
#ifdef CONFIG_PERF_EVENTS
	.perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
	.perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
#endif
#ifdef CONFIG_PREEMPT_RCU
	.rcu_read_lock_nesting = 0,
	.rcu_read_unlock_special.s = 0,
	.rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
	.rcu_blocked_node = NULL,
#endif
#ifdef CONFIG_TASKS_RCU
	.rcu_tasks_holdout = false,
	.rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
	.rcu_tasks_idle_cpu = -1,
#endif
#ifdef CONFIG_TASKS_TRACE_RCU
	.trc_reader_nesting = 0,
	.trc_reader_special.s = 0,
	.trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
	.trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),
#endif
#ifdef CONFIG_CPUSETS
	.mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
						 &init_task.alloc_lock),
#endif
#ifdef CONFIG_RT_MUTEXES
	.pi_waiters	= RB_ROOT_CACHED,
	.pi_top_task	= NULL,
#endif
	INIT_PREV_CPUTIME(init_task)
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
	.vtime.seqcount	= SEQCNT_ZERO(init_task.vtime_seqcount),
	.vtime.starttime = 0,
	.vtime.state	= VTIME_SYS,
#endif
#ifdef CONFIG_NUMA_BALANCING
	.numa_preferred_nid = NUMA_NO_NODE,
	.numa_group	= NULL,
	.numa_faults	= NULL,
#endif
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
	.kasan_depth	= 1,
#endif
#ifdef CONFIG_KCSAN
	.kcsan_ctx = {
		.scoped_accesses	= {LIST_POISON1, NULL},
	},
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
	.softirqs_enabled = 1,
#endif
#ifdef CONFIG_LOCKDEP
	.lockdep_depth = 0, /* no locks held yet */
	.curr_chain_key = INITIAL_CHAIN_KEY,
	.lockdep_recursion = 0,
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
	.ret_stack		= NULL,
	.tracing_graph_pause	= ATOMIC_INIT(0),
#endif
#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
	.trace_recursion = 0,
#endif
#ifdef CONFIG_LIVEPATCH
	.patch_state	= KLP_UNDEFINED,
#endif
#ifdef CONFIG_SECURITY
	.security	= NULL,
#endif
#ifdef CONFIG_SECCOMP_FILTER
	.seccomp	= { .filter_count = ATOMIC_INIT(0) },
#endif
};
EXPORT_SYMBOL(init_task);

/*
 * Initial thread structure. Alignment of this is handled by a special
 * linker map entry.
 */
#ifndef CONFIG_THREAD_INFO_IN_TASK
struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
#endif
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
a4a2eb49 TG	2	#include <linux/init_task.h>
	3	#include <linux/export.h>
	4	#include <linux/mqueue.h>
	5	#include <linux/sched.h>
cf4aebc2	6	#include <linux/sched/sysctl.h>
8bd75c77	7	#include <linux/sched/rt.h>
9164bb4a	8	#include <linux/sched/task.h>
a4a2eb49 TG	9	#include <linux/init.h>
	10	#include <linux/fs.h>
	11	#include <linux/mm.h>
f0b75216	12	#include <linux/audit.h>
98fa15f3	13	#include <linux/numa.h>
d08b9f0c	14	#include <linux/scs.h>
8b7787a5	15	#include <linux/plist.h>
a4a2eb49	16
7c0f6ba6	17	#include <linux/uaccess.h>
a4a2eb49	18
3678e2fc DH	19	static struct signal_struct init_signals = {
	20	.nr_threads = 1,
	21	.thread_head = LIST_HEAD_INIT(init_task.thread_node),
	22	.wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
	23	.shared_pending = {
	24	.list = LIST_HEAD_INIT(init_signals.shared_pending.list),
	25	.signal = {{0}}
	26	},
c3ad2c3b	27	.multiprocess = HLIST_HEAD_INIT,
3678e2fc DH	28	.rlim = INIT_RLIMITS,
3678e2fc DH	29	.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
f7cfd871	30	.exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
3678e2fc DH	31	#ifdef CONFIG_POSIX_TIMERS
	32	.posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
	33	.cputimer = {
	34	.cputime_atomic = INIT_CPUTIME_ATOMIC,
3678e2fc DH	35	},
	36	#endif
	37	INIT_CPU_TIMERS(init_signals)
2c470475 EB	38	.pids = {
2c470475 EB	39	[PIDTYPE_PID] = &init_struct_pid,
6883f81a	40	[PIDTYPE_TGID] = &init_struct_pid,
2c470475 EB	41	[PIDTYPE_PGID] = &init_struct_pid,
	42	[PIDTYPE_SID] = &init_struct_pid,
	43	},
3678e2fc DH	44	INIT_PREV_CPUTIME(init_signals)
	45	};
	46
	47	static struct sighand_struct init_sighand = {
60d4de3f	48	.count = REFCOUNT_INIT(1),
3678e2fc DH	49	.action = { { { .sa_handler = SIG_DFL, } }, },
	50	.siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
	51	.signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
	52	};
a4a2eb49	53
d08b9f0c	54	#ifdef CONFIG_SHADOW_CALL_STACK
0eb5085c	55	unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = {
d08b9f0c ST	56	[(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC
	57	};
	58	#endif
	59
d11ed3ab DH	60	/*
	61	* Set up the first task table, touch at your own risk!. Base=0,
	62	* limit=0x1fffff (=2MB)
	63	*/
0eb5085c	64	struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
4e7e3adb DH	65	#ifdef CONFIG_THREAD_INFO_IN_TASK
4e7e3adb DH	66	.thread_info = INIT_THREAD_INFO(init_task),
f0b89d39	67	.stack_refcount = REFCOUNT_INIT(1),
4e7e3adb	68	#endif
2f064a59	69	.__state = 0,
d11ed3ab	70	.stack = init_stack,
ec1d2819	71	.usage = REFCOUNT_INIT(2),
d11ed3ab	72	.flags = PF_KTHREAD,
4e7e3adb DH	73	.prio = MAX_PRIO - 20,
	74	.static_prio = MAX_PRIO - 20,
	75	.normal_prio = MAX_PRIO - 20,
d11ed3ab	76	.policy = SCHED_NORMAL,
3bd37062	77	.cpus_ptr = &init_task.cpus_mask,
b90ca8ba	78	.user_cpus_ptr = NULL,
3bd37062	79	.cpus_mask = CPU_MASK_ALL,
d11ed3ab DH	80	.nr_cpus_allowed= NR_CPUS,
	81	.mm = NULL,
	82	.active_mm = &init_mm,
2b69987b	83	.faults_disabled_mapping = NULL,
4e7e3adb	84	.restart_block = {
d11ed3ab DH	85	.fn = do_no_restart_syscall,
	86	},
	87	.se = {
	88	.group_node = LIST_HEAD_INIT(init_task.se.group_node),
	89	},
	90	.rt = {
	91	.run_list = LIST_HEAD_INIT(init_task.rt.run_list),
	92	.time_slice = RR_TIMESLICE,
	93	},
	94	.tasks = LIST_HEAD_INIT(init_task.tasks),
4e7e3adb DH	95	#ifdef CONFIG_SMP
	96	.pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
	97	#endif
	98	#ifdef CONFIG_CGROUP_SCHED
	99	.sched_task_group = &root_task_group,
	100	#endif
d11ed3ab DH	101	.ptraced = LIST_HEAD_INIT(init_task.ptraced),
	102	.ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
	103	.real_parent = &init_task,
	104	.parent = &init_task,
	105	.children = LIST_HEAD_INIT(init_task.children),
	106	.sibling = LIST_HEAD_INIT(init_task.sibling),
	107	.group_leader = &init_task,
	108	RCU_POINTER_INITIALIZER(real_cred, &init_cred),
	109	RCU_POINTER_INITIALIZER(cred, &init_cred),
	110	.comm = INIT_TASK_COMM,
	111	.thread = INIT_THREAD,
	112	.fs = &init_fs,
	113	.files = &init_files,
0f212204 JA	114	#ifdef CONFIG_IO_URING
	115	.io_uring = NULL,
	116	#endif
d11ed3ab DH	117	.signal = &init_signals,
	118	.sighand = &init_sighand,
	119	.nsproxy = &init_nsproxy,
	120	.pending = {
	121	.list = LIST_HEAD_INIT(init_task.pending.list),
	122	.signal = {{0}}
	123	},
	124	.blocked = {{0}},
	125	.alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
	126	.journal_info = NULL,
	127	INIT_CPU_TIMERS(init_task)
	128	.pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
	129	.timer_slack_ns = 50000, /* 50 usec default slack */
2c470475	130	.thread_pid = &init_struct_pid,
d11ed3ab	131	.thread_node = LIST_HEAD_INIT(init_signals.thread_head),
4b7d248b	132	#ifdef CONFIG_AUDIT
4e7e3adb	133	.loginuid = INVALID_UID,
f0b75216	134	.sessionid = AUDIT_SID_UNSET,
4e7e3adb DH	135	#endif
	136	#ifdef CONFIG_PERF_EVENTS
	137	.perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
	138	.perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
	139	#endif
	140	#ifdef CONFIG_PREEMPT_RCU
	141	.rcu_read_lock_nesting = 0,
	142	.rcu_read_unlock_special.s = 0,
	143	.rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
	144	.rcu_blocked_node = NULL,
	145	#endif
	146	#ifdef CONFIG_TASKS_RCU
	147	.rcu_tasks_holdout = false,
	148	.rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
	149	.rcu_tasks_idle_cpu = -1,
	150	#endif
d5f177d3 PM	151	#ifdef CONFIG_TASKS_TRACE_RCU
d5f177d3 PM	152	.trc_reader_nesting = 0,
276c4104	153	.trc_reader_special.s = 0,
d5f177d3	154	.trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
434c9eef	155	.trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),
d5f177d3	156	#endif
4e7e3adb	157	#ifdef CONFIG_CPUSETS
b7505861 AD	158	.mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
b7505861 AD	159	&init_task.alloc_lock),
4e7e3adb DH	160	#endif
	161	#ifdef CONFIG_RT_MUTEXES
	162	.pi_waiters = RB_ROOT_CACHED,
	163	.pi_top_task = NULL,
	164	#endif
d11ed3ab	165	INIT_PREV_CPUTIME(init_task)
4e7e3adb DH	166	#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
	167	.vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
	168	.vtime.starttime = 0,
	169	.vtime.state = VTIME_SYS,
	170	#endif
	171	#ifdef CONFIG_NUMA_BALANCING
98fa15f3	172	.numa_preferred_nid = NUMA_NO_NODE,
4e7e3adb DH	173	.numa_group = NULL,
	174	.numa_faults = NULL,
	175	#endif
d73b4936	176	#if defined(CONFIG_KASAN_GENERIC) \|\| defined(CONFIG_KASAN_SW_TAGS)
4e7e3adb DH	177	.kasan_depth = 1,
4e7e3adb DH	178	#endif
dfd402a4 ME	179	#ifdef CONFIG_KCSAN
dfd402a4 ME	180	.kcsan_ctx = {
757a4cef	181	.scoped_accesses = {LIST_POISON1, NULL},
dfd402a4 ME	182	},
dfd402a4 ME	183	#endif
4e7e3adb DH	184	#ifdef CONFIG_TRACE_IRQFLAGS
	185	.softirqs_enabled = 1,
	186	#endif
	187	#ifdef CONFIG_LOCKDEP
e196e479	188	.lockdep_depth = 0, /* no locks held yet */
f6ec8829	189	.curr_chain_key = INITIAL_CHAIN_KEY,
4e7e3adb DH	190	.lockdep_recursion = 0,
	191	#endif
	192	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
7e0a9220 SRV	193	.ret_stack = NULL,
7e0a9220 SRV	194	.tracing_graph_pause = ATOMIC_INIT(0),
4e7e3adb	195	#endif
c1a280b6	196	#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
4e7e3adb DH	197	.trace_recursion = 0,
	198	#endif
	199	#ifdef CONFIG_LIVEPATCH
	200	.patch_state = KLP_UNDEFINED,
	201	#endif
	202	#ifdef CONFIG_SECURITY
	203	.security = NULL,
	204	#endif
64bdc024	205	#ifdef CONFIG_SECCOMP_FILTER
c818c03b KC	206	.seccomp = { .filter_count = ATOMIC_INIT(0) },
c818c03b KC	207	#endif
d11ed3ab	208	};
a4a2eb49 TG	209	EXPORT_SYMBOL(init_task);
	210
	211	/*
	212	* Initial thread structure. Alignment of this is handled by a special
	213	* linker map entry.
	214	*/
c65eacbe	215	#ifndef CONFIG_THREAD_INFO_IN_TASK
0500871f	216	struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
c65eacbe	217	#endif