[linux-2.6-block.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/sched/ext.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		= HLIST_HEAD_INIT,
	.ignored_posix_timers	= HLIST_HEAD_INIT,
	.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,
	.max_allowed_capacity	= SCHED_CAPACITY_SCALE,
	.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
#ifdef CONFIG_SCHED_CLASS_EXT
	.scx		= {
		.dsq_list.node	= LIST_HEAD_INIT(init_task.scx.dsq_list.node),
		.sticky_cpu	= -1,
		.holding_cpu	= -1,
		.runnable_node	= LIST_HEAD_INIT(init_task.scx.runnable_node),
		.runnable_at	= INITIAL_JIFFIES,
		.ddsp_dsq_id	= SCX_DSQ_INVALID,
		.slice		= SCX_SLICE_DFL,
	},
#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,
	.rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list),
#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_TRANSITION_IDLE,
#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>
f0e1a064	9	#include <linux/sched/ext.h>
a4a2eb49 TG	10	#include <linux/init.h>
	11	#include <linux/fs.h>
	12	#include <linux/mm.h>
f0b75216	13	#include <linux/audit.h>
98fa15f3	14	#include <linux/numa.h>
d08b9f0c	15	#include <linux/scs.h>
8b7787a5	16	#include <linux/plist.h>
a4a2eb49	17
7c0f6ba6	18	#include <linux/uaccess.h>
a4a2eb49	19
3678e2fc DH	20	static struct signal_struct init_signals = {
	21	.nr_threads = 1,
	22	.thread_head = LIST_HEAD_INIT(init_task.thread_node),
	23	.wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
	24	.shared_pending = {
	25	.list = LIST_HEAD_INIT(init_signals.shared_pending.list),
	26	.signal = {{0}}
	27	},
c3ad2c3b	28	.multiprocess = HLIST_HEAD_INIT,
3678e2fc DH	29	.rlim = INIT_RLIMITS,
3678e2fc DH	30	.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
f7cfd871	31	.exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
3678e2fc	32	#ifdef CONFIG_POSIX_TIMERS
69f032c9 TG	33	.posix_timers = HLIST_HEAD_INIT,
	34	.ignored_posix_timers = HLIST_HEAD_INIT,
	35	.cputimer = {
3678e2fc	36	.cputime_atomic = INIT_CPUTIME_ATOMIC,
3678e2fc DH	37	},
	38	#endif
	39	INIT_CPU_TIMERS(init_signals)
2c470475 EB	40	.pids = {
2c470475 EB	41	[PIDTYPE_PID] = &init_struct_pid,
6883f81a	42	[PIDTYPE_TGID] = &init_struct_pid,
2c470475 EB	43	[PIDTYPE_PGID] = &init_struct_pid,
	44	[PIDTYPE_SID] = &init_struct_pid,
	45	},
3678e2fc DH	46	INIT_PREV_CPUTIME(init_signals)
	47	};
	48
	49	static struct sighand_struct init_sighand = {
60d4de3f	50	.count = REFCOUNT_INIT(1),
3678e2fc DH	51	.action = { { { .sa_handler = SIG_DFL, } }, },
	52	.siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
	53	.signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
	54	};
a4a2eb49	55
d08b9f0c	56	#ifdef CONFIG_SHADOW_CALL_STACK
0eb5085c	57	unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = {
d08b9f0c ST	58	[(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC
	59	};
	60	#endif
	61
d11ed3ab DH	62	/*
	63	* Set up the first task table, touch at your own risk!. Base=0,
	64	* limit=0x1fffff (=2MB)
	65	*/
0eb5085c	66	struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
4e7e3adb DH	67	#ifdef CONFIG_THREAD_INFO_IN_TASK
4e7e3adb DH	68	.thread_info = INIT_THREAD_INFO(init_task),
f0b89d39	69	.stack_refcount = REFCOUNT_INIT(1),
4e7e3adb	70	#endif
2f064a59	71	.__state = 0,
d11ed3ab	72	.stack = init_stack,
ec1d2819	73	.usage = REFCOUNT_INIT(2),
d11ed3ab	74	.flags = PF_KTHREAD,
4e7e3adb DH	75	.prio = MAX_PRIO - 20,
	76	.static_prio = MAX_PRIO - 20,
	77	.normal_prio = MAX_PRIO - 20,
d11ed3ab	78	.policy = SCHED_NORMAL,
3bd37062	79	.cpus_ptr = &init_task.cpus_mask,
b90ca8ba	80	.user_cpus_ptr = NULL,
3bd37062	81	.cpus_mask = CPU_MASK_ALL,
22d56074	82	.max_allowed_capacity = SCHED_CAPACITY_SCALE,
d11ed3ab DH	83	.nr_cpus_allowed= NR_CPUS,
	84	.mm = NULL,
	85	.active_mm = &init_mm,
2b69987b	86	.faults_disabled_mapping = NULL,
4e7e3adb	87	.restart_block = {
d11ed3ab DH	88	.fn = do_no_restart_syscall,
	89	},
	90	.se = {
	91	.group_node = LIST_HEAD_INIT(init_task.se.group_node),
	92	},
	93	.rt = {
	94	.run_list = LIST_HEAD_INIT(init_task.rt.run_list),
	95	.time_slice = RR_TIMESLICE,
	96	},
	97	.tasks = LIST_HEAD_INIT(init_task.tasks),
4e7e3adb DH	98	#ifdef CONFIG_SMP
	99	.pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
	100	#endif
	101	#ifdef CONFIG_CGROUP_SCHED
	102	.sched_task_group = &root_task_group,
f0e1a064 TH	103	#endif
	104	#ifdef CONFIG_SCHED_CLASS_EXT
	105	.scx = {
d4af01c3	106	.dsq_list.node = LIST_HEAD_INIT(init_task.scx.dsq_list.node),
f0e1a064 TH	107	.sticky_cpu = -1,
	108	.holding_cpu = -1,
	109	.runnable_node = LIST_HEAD_INIT(init_task.scx.runnable_node),
8a010b81	110	.runnable_at = INITIAL_JIFFIES,
f0e1a064 TH	111	.ddsp_dsq_id = SCX_DSQ_INVALID,
	112	.slice = SCX_SLICE_DFL,
	113	},
4e7e3adb	114	#endif
d11ed3ab DH	115	.ptraced = LIST_HEAD_INIT(init_task.ptraced),
	116	.ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
	117	.real_parent = &init_task,
	118	.parent = &init_task,
	119	.children = LIST_HEAD_INIT(init_task.children),
	120	.sibling = LIST_HEAD_INIT(init_task.sibling),
	121	.group_leader = &init_task,
	122	RCU_POINTER_INITIALIZER(real_cred, &init_cred),
	123	RCU_POINTER_INITIALIZER(cred, &init_cred),
	124	.comm = INIT_TASK_COMM,
	125	.thread = INIT_THREAD,
	126	.fs = &init_fs,
	127	.files = &init_files,
0f212204 JA	128	#ifdef CONFIG_IO_URING
	129	.io_uring = NULL,
	130	#endif
d11ed3ab DH	131	.signal = &init_signals,
	132	.sighand = &init_sighand,
	133	.nsproxy = &init_nsproxy,
	134	.pending = {
	135	.list = LIST_HEAD_INIT(init_task.pending.list),
	136	.signal = {{0}}
	137	},
	138	.blocked = {{0}},
	139	.alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
	140	.journal_info = NULL,
	141	INIT_CPU_TIMERS(init_task)
	142	.pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
	143	.timer_slack_ns = 50000, /* 50 usec default slack */
2c470475	144	.thread_pid = &init_struct_pid,
d11ed3ab	145	.thread_node = LIST_HEAD_INIT(init_signals.thread_head),
4b7d248b	146	#ifdef CONFIG_AUDIT
4e7e3adb	147	.loginuid = INVALID_UID,
f0b75216	148	.sessionid = AUDIT_SID_UNSET,
4e7e3adb DH	149	#endif
	150	#ifdef CONFIG_PERF_EVENTS
	151	.perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
	152	.perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
	153	#endif
	154	#ifdef CONFIG_PREEMPT_RCU
	155	.rcu_read_lock_nesting = 0,
	156	.rcu_read_unlock_special.s = 0,
	157	.rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
	158	.rcu_blocked_node = NULL,
	159	#endif
	160	#ifdef CONFIG_TASKS_RCU
	161	.rcu_tasks_holdout = false,
	162	.rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
	163	.rcu_tasks_idle_cpu = -1,
46faf9d8	164	.rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list),
4e7e3adb	165	#endif
d5f177d3 PM	166	#ifdef CONFIG_TASKS_TRACE_RCU
d5f177d3 PM	167	.trc_reader_nesting = 0,
276c4104	168	.trc_reader_special.s = 0,
d5f177d3	169	.trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
434c9eef	170	.trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),
d5f177d3	171	#endif
4e7e3adb	172	#ifdef CONFIG_CPUSETS
b7505861 AD	173	.mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
b7505861 AD	174	&init_task.alloc_lock),
4e7e3adb DH	175	#endif
	176	#ifdef CONFIG_RT_MUTEXES
	177	.pi_waiters = RB_ROOT_CACHED,
	178	.pi_top_task = NULL,
	179	#endif
d11ed3ab	180	INIT_PREV_CPUTIME(init_task)
4e7e3adb DH	181	#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
	182	.vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
	183	.vtime.starttime = 0,
	184	.vtime.state = VTIME_SYS,
	185	#endif
	186	#ifdef CONFIG_NUMA_BALANCING
98fa15f3	187	.numa_preferred_nid = NUMA_NO_NODE,
4e7e3adb DH	188	.numa_group = NULL,
	189	.numa_faults = NULL,
	190	#endif
d73b4936	191	#if defined(CONFIG_KASAN_GENERIC) \|\| defined(CONFIG_KASAN_SW_TAGS)
4e7e3adb DH	192	.kasan_depth = 1,
4e7e3adb DH	193	#endif
dfd402a4 ME	194	#ifdef CONFIG_KCSAN
dfd402a4 ME	195	.kcsan_ctx = {
757a4cef	196	.scoped_accesses = {LIST_POISON1, NULL},
dfd402a4 ME	197	},
dfd402a4 ME	198	#endif
4e7e3adb DH	199	#ifdef CONFIG_TRACE_IRQFLAGS
	200	.softirqs_enabled = 1,
	201	#endif
	202	#ifdef CONFIG_LOCKDEP
e196e479	203	.lockdep_depth = 0, /* no locks held yet */
f6ec8829	204	.curr_chain_key = INITIAL_CHAIN_KEY,
4e7e3adb DH	205	.lockdep_recursion = 0,
	206	#endif
	207	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
7e0a9220 SRV	208	.ret_stack = NULL,
7e0a9220 SRV	209	.tracing_graph_pause = ATOMIC_INIT(0),
4e7e3adb	210	#endif
c1a280b6	211	#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
4e7e3adb DH	212	.trace_recursion = 0,
	213	#endif
	214	#ifdef CONFIG_LIVEPATCH
d927752f	215	.patch_state = KLP_TRANSITION_IDLE,
4e7e3adb DH	216	#endif
	217	#ifdef CONFIG_SECURITY
	218	.security = NULL,
	219	#endif
64bdc024	220	#ifdef CONFIG_SECCOMP_FILTER
c818c03b KC	221	.seccomp = { .filter_count = ATOMIC_INIT(0) },
c818c03b KC	222	#endif
d11ed3ab	223	};
a4a2eb49 TG	224	EXPORT_SYMBOL(init_task);
	225
	226	/*
	227	* Initial thread structure. Alignment of this is handled by a special
	228	* linker map entry.
	229	*/
c65eacbe	230	#ifndef CONFIG_THREAD_INFO_IN_TASK
0500871f	231	struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
c65eacbe	232	#endif