1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/init_task.h>
  3#include <linux/export.h>
  4#include <linux/mqueue.h>
  5#include <linux/sched.h>
  6#include <linux/sched/sysctl.h>
  7#include <linux/sched/rt.h>
  8#include <linux/sched/task.h>
  9#include <linux/init.h>
 10#include <linux/fs.h>
 11#include <linux/mm.h>
 12
 13#include <asm/pgtable.h>
 14#include <linux/uaccess.h>
 15
 16static struct signal_struct init_signals = {
 17	.nr_threads	= 1,
 18	.thread_head	= LIST_HEAD_INIT(init_task.thread_node),
 19	.wait_chldexit	= __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
 20	.shared_pending	= {
 21		.list = LIST_HEAD_INIT(init_signals.shared_pending.list),
 22		.signal =  {{0}}
 23	},
 24	.rlim		= INIT_RLIMITS,
 25	.cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
 26#ifdef CONFIG_POSIX_TIMERS
 27	.posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
 28	.cputimer	= {
 29		.cputime_atomic	= INIT_CPUTIME_ATOMIC,
 30		.running	= false,
 31		.checking_timer = false,
 32	},
 33#endif
 34	INIT_CPU_TIMERS(init_signals)
 35	INIT_PREV_CPUTIME(init_signals)
 36};
 37
 38static struct sighand_struct init_sighand = {
 39	.count		= ATOMIC_INIT(1),
 40	.action		= { { { .sa_handler = SIG_DFL, } }, },
 41	.siglock	= __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
 42	.signalfd_wqh	= __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
 43};
 44
 45/*
 46 * Set up the first task table, touch at your own risk!. Base=0,
 47 * limit=0x1fffff (=2MB)
 48 */
 49struct task_struct init_task
 50#ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
 51	__init_task_data
 52#endif
 53= {
 54#ifdef CONFIG_THREAD_INFO_IN_TASK
 55	.thread_info	= INIT_THREAD_INFO(init_task),
 56	.stack_refcount	= ATOMIC_INIT(1),
 57#endif
 58	.state		= 0,
 59	.stack		= init_stack,
 60	.usage		= ATOMIC_INIT(2),
 61	.flags		= PF_KTHREAD,
 62	.prio		= MAX_PRIO - 20,
 63	.static_prio	= MAX_PRIO - 20,
 64	.normal_prio	= MAX_PRIO - 20,
 65	.policy		= SCHED_NORMAL,
 66	.cpus_allowed	= CPU_MASK_ALL,
 67	.nr_cpus_allowed= NR_CPUS,
 68	.mm		= NULL,
 69	.active_mm	= &init_mm,
 70	.restart_block	= {
 71		.fn = do_no_restart_syscall,
 72	},
 73	.se		= {
 74		.group_node 	= LIST_HEAD_INIT(init_task.se.group_node),
 75	},
 76	.rt		= {
 77		.run_list	= LIST_HEAD_INIT(init_task.rt.run_list),
 78		.time_slice	= RR_TIMESLICE,
 79	},
 80	.tasks		= LIST_HEAD_INIT(init_task.tasks),
 81#ifdef CONFIG_SMP
 82	.pushable_tasks	= PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
 83#endif
 84#ifdef CONFIG_CGROUP_SCHED
 85	.sched_task_group = &root_task_group,
 86#endif
 87	.ptraced	= LIST_HEAD_INIT(init_task.ptraced),
 88	.ptrace_entry	= LIST_HEAD_INIT(init_task.ptrace_entry),
 89	.real_parent	= &init_task,
 90	.parent		= &init_task,
 91	.children	= LIST_HEAD_INIT(init_task.children),
 92	.sibling	= LIST_HEAD_INIT(init_task.sibling),
 93	.group_leader	= &init_task,
 94	RCU_POINTER_INITIALIZER(real_cred, &init_cred),
 95	RCU_POINTER_INITIALIZER(cred, &init_cred),
 96	.comm		= INIT_TASK_COMM,
 97	.thread		= INIT_THREAD,
 98	.fs		= &init_fs,
 99	.files		= &init_files,
100	.signal		= &init_signals,
101	.sighand	= &init_sighand,
102	.nsproxy	= &init_nsproxy,
103	.pending	= {
104		.list = LIST_HEAD_INIT(init_task.pending.list),
105		.signal = {{0}}
106	},
107	.blocked	= {{0}},
108	.alloc_lock	= __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
109	.journal_info	= NULL,
110	INIT_CPU_TIMERS(init_task)
111	.pi_lock	= __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
112	.timer_slack_ns = 50000, /* 50 usec default slack */
113	.pids = {
114		[PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),
115		[PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),
116		[PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),
117	},
118	.thread_group	= LIST_HEAD_INIT(init_task.thread_group),
119	.thread_node	= LIST_HEAD_INIT(init_signals.thread_head),
120#ifdef CONFIG_AUDITSYSCALL
121	.loginuid	= INVALID_UID,
122	.sessionid	= (unsigned int)-1,
123#endif
124#ifdef CONFIG_PERF_EVENTS
125	.perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
126	.perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
127#endif
128#ifdef CONFIG_PREEMPT_RCU
129	.rcu_read_lock_nesting = 0,
130	.rcu_read_unlock_special.s = 0,
131	.rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
132	.rcu_blocked_node = NULL,
133#endif
134#ifdef CONFIG_TASKS_RCU
135	.rcu_tasks_holdout = false,
136	.rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
137	.rcu_tasks_idle_cpu = -1,
138#endif
139#ifdef CONFIG_CPUSETS
140	.mems_allowed_seq = SEQCNT_ZERO(init_task.mems_allowed_seq),
141#endif
142#ifdef CONFIG_RT_MUTEXES
143	.pi_waiters	= RB_ROOT_CACHED,
144	.pi_top_task	= NULL,
145#endif
146	INIT_PREV_CPUTIME(init_task)
147#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
148	.vtime.seqcount	= SEQCNT_ZERO(init_task.vtime_seqcount),
149	.vtime.starttime = 0,
150	.vtime.state	= VTIME_SYS,
151#endif
152#ifdef CONFIG_NUMA_BALANCING
153	.numa_preferred_nid = -1,
154	.numa_group	= NULL,
155	.numa_faults	= NULL,
156#endif
157#ifdef CONFIG_KASAN
158	.kasan_depth	= 1,
159#endif
160#ifdef CONFIG_TRACE_IRQFLAGS
161	.softirqs_enabled = 1,
162#endif
163#ifdef CONFIG_LOCKDEP
164	.lockdep_recursion = 0,
165#endif
166#ifdef CONFIG_FUNCTION_GRAPH_TRACER
167	.ret_stack	= NULL,
168#endif
169#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
170	.trace_recursion = 0,
171#endif
172#ifdef CONFIG_LIVEPATCH
173	.patch_state	= KLP_UNDEFINED,
174#endif
175#ifdef CONFIG_SECURITY
176	.security	= NULL,
177#endif
178};
179EXPORT_SYMBOL(init_task);
180
181/*
182 * Initial thread structure. Alignment of this is handled by a special
183 * linker map entry.
184 */
185#ifndef CONFIG_THREAD_INFO_IN_TASK
186struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
187#endif