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#include <linux/audit.h>
13#include <linux/numa.h>
14
15#include <asm/pgtable.h>
16#include <linux/uaccess.h>
17
18static struct signal_struct init_signals = {
19 .nr_threads = 1,
20 .thread_head = LIST_HEAD_INIT(init_task.thread_node),
21 .wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(init_signals.wait_chldexit),
22 .shared_pending = {
23 .list = LIST_HEAD_INIT(init_signals.shared_pending.list),
24 .signal = {{0}}
25 },
26 .multiprocess = HLIST_HEAD_INIT,
27 .rlim = INIT_RLIMITS,
28 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
29#ifdef CONFIG_POSIX_TIMERS
30 .posix_timers = LIST_HEAD_INIT(init_signals.posix_timers),
31 .cputimer = {
32 .cputime_atomic = INIT_CPUTIME_ATOMIC,
33 .running = false,
34 .checking_timer = false,
35 },
36#endif
37 INIT_CPU_TIMERS(init_signals)
38 .pids = {
39 [PIDTYPE_PID] = &init_struct_pid,
40 [PIDTYPE_TGID] = &init_struct_pid,
41 [PIDTYPE_PGID] = &init_struct_pid,
42 [PIDTYPE_SID] = &init_struct_pid,
43 },
44 INIT_PREV_CPUTIME(init_signals)
45};
46
47static struct sighand_struct init_sighand = {
48 .count = REFCOUNT_INIT(1),
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};
53
54/*
55 * Set up the first task table, touch at your own risk!. Base=0,
56 * limit=0x1fffff (=2MB)
57 */
58struct task_struct init_task
59#ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
60 __init_task_data
61#endif
62= {
63#ifdef CONFIG_THREAD_INFO_IN_TASK
64 .thread_info = INIT_THREAD_INFO(init_task),
65 .stack_refcount = REFCOUNT_INIT(1),
66#endif
67 .state = 0,
68 .stack = init_stack,
69 .usage = REFCOUNT_INIT(2),
70 .flags = PF_KTHREAD,
71 .prio = MAX_PRIO - 20,
72 .static_prio = MAX_PRIO - 20,
73 .normal_prio = MAX_PRIO - 20,
74 .policy = SCHED_NORMAL,
75 .cpus_allowed = CPU_MASK_ALL,
76 .nr_cpus_allowed= NR_CPUS,
77 .mm = NULL,
78 .active_mm = &init_mm,
79 .restart_block = {
80 .fn = do_no_restart_syscall,
81 },
82 .se = {
83 .group_node = LIST_HEAD_INIT(init_task.se.group_node),
84 },
85 .rt = {
86 .run_list = LIST_HEAD_INIT(init_task.rt.run_list),
87 .time_slice = RR_TIMESLICE,
88 },
89 .tasks = LIST_HEAD_INIT(init_task.tasks),
90#ifdef CONFIG_SMP
91 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
92#endif
93#ifdef CONFIG_CGROUP_SCHED
94 .sched_task_group = &root_task_group,
95#endif
96 .ptraced = LIST_HEAD_INIT(init_task.ptraced),
97 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
98 .real_parent = &init_task,
99 .parent = &init_task,
100 .children = LIST_HEAD_INIT(init_task.children),
101 .sibling = LIST_HEAD_INIT(init_task.sibling),
102 .group_leader = &init_task,
103 RCU_POINTER_INITIALIZER(real_cred, &init_cred),
104 RCU_POINTER_INITIALIZER(cred, &init_cred),
105 .comm = INIT_TASK_COMM,
106 .thread = INIT_THREAD,
107 .fs = &init_fs,
108 .files = &init_files,
109 .signal = &init_signals,
110 .sighand = &init_sighand,
111 .nsproxy = &init_nsproxy,
112 .pending = {
113 .list = LIST_HEAD_INIT(init_task.pending.list),
114 .signal = {{0}}
115 },
116 .blocked = {{0}},
117 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
118 .journal_info = NULL,
119 INIT_CPU_TIMERS(init_task)
120 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
121 .timer_slack_ns = 50000, /* 50 usec default slack */
122 .thread_pid = &init_struct_pid,
123 .thread_group = LIST_HEAD_INIT(init_task.thread_group),
124 .thread_node = LIST_HEAD_INIT(init_signals.thread_head),
125#ifdef CONFIG_AUDIT
126 .loginuid = INVALID_UID,
127 .sessionid = AUDIT_SID_UNSET,
128#endif
129#ifdef CONFIG_PERF_EVENTS
130 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
131 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
132#endif
133#ifdef CONFIG_PREEMPT_RCU
134 .rcu_read_lock_nesting = 0,
135 .rcu_read_unlock_special.s = 0,
136 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
137 .rcu_blocked_node = NULL,
138#endif
139#ifdef CONFIG_TASKS_RCU
140 .rcu_tasks_holdout = false,
141 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
142 .rcu_tasks_idle_cpu = -1,
143#endif
144#ifdef CONFIG_CPUSETS
145 .mems_allowed_seq = SEQCNT_ZERO(init_task.mems_allowed_seq),
146#endif
147#ifdef CONFIG_RT_MUTEXES
148 .pi_waiters = RB_ROOT_CACHED,
149 .pi_top_task = NULL,
150#endif
151 INIT_PREV_CPUTIME(init_task)
152#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
153 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
154 .vtime.starttime = 0,
155 .vtime.state = VTIME_SYS,
156#endif
157#ifdef CONFIG_NUMA_BALANCING
158 .numa_preferred_nid = NUMA_NO_NODE,
159 .numa_group = NULL,
160 .numa_faults = NULL,
161#endif
162#ifdef CONFIG_KASAN
163 .kasan_depth = 1,
164#endif
165#ifdef CONFIG_TRACE_IRQFLAGS
166 .softirqs_enabled = 1,
167#endif
168#ifdef CONFIG_LOCKDEP
169 .lockdep_recursion = 0,
170#endif
171#ifdef CONFIG_FUNCTION_GRAPH_TRACER
172 .ret_stack = NULL,
173#endif
174#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
175 .trace_recursion = 0,
176#endif
177#ifdef CONFIG_LIVEPATCH
178 .patch_state = KLP_UNDEFINED,
179#endif
180#ifdef CONFIG_SECURITY
181 .security = NULL,
182#endif
183};
184EXPORT_SYMBOL(init_task);
185
186/*
187 * Initial thread structure. Alignment of this is handled by a special
188 * linker map entry.
189 */
190#ifndef CONFIG_THREAD_INFO_IN_TASK
191struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
192#endif
193