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/sched/ext.h>
10#include <linux/init.h>
11#include <linux/fs.h>
12#include <linux/mm.h>
13#include <linux/audit.h>
14#include <linux/numa.h>
15#include <linux/scs.h>
16#include <linux/plist.h>
17
18#include <linux/uaccess.h>
19
20static 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 },
28 .multiprocess = HLIST_HEAD_INIT,
29 .rlim = INIT_RLIMITS,
30#ifdef CONFIG_CGROUPS
31 .cgroup_threadgroup_rwsem = __RWSEM_INITIALIZER(init_signals.cgroup_threadgroup_rwsem),
32#endif
33 .cred_guard_mutex = __MUTEX_INITIALIZER(init_signals.cred_guard_mutex),
34 .exec_update_lock = __RWSEM_INITIALIZER(init_signals.exec_update_lock),
35#ifdef CONFIG_POSIX_TIMERS
36 .posix_timers = HLIST_HEAD_INIT,
37 .ignored_posix_timers = HLIST_HEAD_INIT,
38 .cputimer = {
39 .cputime_atomic = INIT_CPUTIME_ATOMIC,
40 },
41#endif
42 INIT_CPU_TIMERS(init_signals)
43 .pids = {
44 [PIDTYPE_PID] = &init_struct_pid,
45 [PIDTYPE_TGID] = &init_struct_pid,
46 [PIDTYPE_PGID] = &init_struct_pid,
47 [PIDTYPE_SID] = &init_struct_pid,
48 },
49 INIT_PREV_CPUTIME(init_signals)
50};
51
52static struct sighand_struct init_sighand = {
53 .count = REFCOUNT_INIT(1),
54 .action = { { { .sa_handler = SIG_DFL, } }, },
55 .siglock = __SPIN_LOCK_UNLOCKED(init_sighand.siglock),
56 .signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(init_sighand.signalfd_wqh),
57};
58
59#ifdef CONFIG_SHADOW_CALL_STACK
60unsigned long init_shadow_call_stack[SCS_SIZE / sizeof(long)] = {
61 [(SCS_SIZE / sizeof(long)) - 1] = SCS_END_MAGIC
62};
63#endif
64
65/*
66 * Set up the first task table, touch at your own risk!. Base=0,
67 * limit=0x1fffff (=2MB)
68 */
69struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
70#ifdef CONFIG_THREAD_INFO_IN_TASK
71 .thread_info = INIT_THREAD_INFO(init_task),
72 .stack_refcount = REFCOUNT_INIT(1),
73#endif
74 .__state = 0,
75 .stack = init_stack,
76 .usage = REFCOUNT_INIT(2),
77 .flags = PF_KTHREAD,
78 .prio = MAX_PRIO - 20,
79 .static_prio = MAX_PRIO - 20,
80 .normal_prio = MAX_PRIO - 20,
81 .policy = SCHED_NORMAL,
82 .cpus_ptr = &init_task.cpus_mask,
83 .user_cpus_ptr = NULL,
84 .cpus_mask = CPU_MASK_ALL,
85 .max_allowed_capacity = SCHED_CAPACITY_SCALE,
86 .nr_cpus_allowed= NR_CPUS,
87 .mm = NULL,
88 .active_mm = &init_mm,
89 .faults_disabled_mapping = NULL,
90 .restart_block = {
91 .fn = do_no_restart_syscall,
92 },
93 .se = {
94 .group_node = LIST_HEAD_INIT(init_task.se.group_node),
95 },
96 .rt = {
97 .run_list = LIST_HEAD_INIT(init_task.rt.run_list),
98 .time_slice = RR_TIMESLICE,
99 },
100 .tasks = LIST_HEAD_INIT(init_task.tasks),
101#ifdef CONFIG_SMP
102 .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
103#endif
104#ifdef CONFIG_CGROUP_SCHED
105 .sched_task_group = &root_task_group,
106#endif
107#ifdef CONFIG_SCHED_CLASS_EXT
108 .scx = {
109 .dsq_list.node = LIST_HEAD_INIT(init_task.scx.dsq_list.node),
110 .sticky_cpu = -1,
111 .holding_cpu = -1,
112 .runnable_node = LIST_HEAD_INIT(init_task.scx.runnable_node),
113 .runnable_at = INITIAL_JIFFIES,
114 .ddsp_dsq_id = SCX_DSQ_INVALID,
115 .slice = SCX_SLICE_DFL,
116 },
117#endif
118 .ptraced = LIST_HEAD_INIT(init_task.ptraced),
119 .ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
120 .real_parent = &init_task,
121 .parent = &init_task,
122 .children = LIST_HEAD_INIT(init_task.children),
123 .sibling = LIST_HEAD_INIT(init_task.sibling),
124 .group_leader = &init_task,
125 RCU_POINTER_INITIALIZER(real_cred, &init_cred),
126 RCU_POINTER_INITIALIZER(cred, &init_cred),
127 .comm = INIT_TASK_COMM,
128 .thread = INIT_THREAD,
129 .fs = &init_fs,
130 .files = &init_files,
131#ifdef CONFIG_IO_URING
132 .io_uring = NULL,
133#endif
134 .signal = &init_signals,
135 .sighand = &init_sighand,
136 .nsproxy = &init_nsproxy,
137 .pending = {
138 .list = LIST_HEAD_INIT(init_task.pending.list),
139 .signal = {{0}}
140 },
141 .blocked = {{0}},
142 .alloc_lock = __SPIN_LOCK_UNLOCKED(init_task.alloc_lock),
143 .journal_info = NULL,
144 INIT_CPU_TIMERS(init_task)
145 .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(init_task.pi_lock),
146 .timer_slack_ns = 50000, /* 50 usec default slack */
147 .thread_pid = &init_struct_pid,
148 .thread_node = LIST_HEAD_INIT(init_signals.thread_head),
149#ifdef CONFIG_AUDIT
150 .loginuid = INVALID_UID,
151 .sessionid = AUDIT_SID_UNSET,
152#endif
153#ifdef CONFIG_PERF_EVENTS
154 .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
155 .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
156#endif
157#ifdef CONFIG_PREEMPT_RCU
158 .rcu_read_lock_nesting = 0,
159 .rcu_read_unlock_special.s = 0,
160 .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
161 .rcu_blocked_node = NULL,
162#endif
163#ifdef CONFIG_TASKS_RCU
164 .rcu_tasks_holdout = false,
165 .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
166 .rcu_tasks_idle_cpu = -1,
167 .rcu_tasks_exit_list = LIST_HEAD_INIT(init_task.rcu_tasks_exit_list),
168#endif
169#ifdef CONFIG_TASKS_TRACE_RCU
170 .trc_reader_nesting = 0,
171 .trc_reader_special.s = 0,
172 .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list),
173 .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node),
174#endif
175#ifdef CONFIG_CPUSETS
176 .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq,
177 &init_task.alloc_lock),
178#endif
179#ifdef CONFIG_RT_MUTEXES
180 .pi_waiters = RB_ROOT_CACHED,
181 .pi_top_task = NULL,
182#endif
183 INIT_PREV_CPUTIME(init_task)
184#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
185 .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
186 .vtime.starttime = 0,
187 .vtime.state = VTIME_SYS,
188#endif
189#ifdef CONFIG_NUMA_BALANCING
190 .numa_preferred_nid = NUMA_NO_NODE,
191 .numa_group = NULL,
192 .numa_faults = NULL,
193#endif
194#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
195 .kasan_depth = 1,
196#endif
197#ifdef CONFIG_KCSAN
198 .kcsan_ctx = {
199 .scoped_accesses = {LIST_POISON1, NULL},
200 },
201#endif
202#ifdef CONFIG_TRACE_IRQFLAGS
203 .softirqs_enabled = 1,
204#endif
205#ifdef CONFIG_LOCKDEP
206 .lockdep_depth = 0, /* no locks held yet */
207 .curr_chain_key = INITIAL_CHAIN_KEY,
208 .lockdep_recursion = 0,
209#endif
210#ifdef CONFIG_FUNCTION_GRAPH_TRACER
211 .ret_stack = NULL,
212 .tracing_graph_pause = ATOMIC_INIT(0),
213#endif
214#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPTION)
215 .trace_recursion = 0,
216#endif
217#ifdef CONFIG_LIVEPATCH
218 .patch_state = KLP_TRANSITION_IDLE,
219#endif
220#ifdef CONFIG_SECURITY
221 .security = NULL,
222#endif
223#ifdef CONFIG_SECCOMP_FILTER
224 .seccomp = { .filter_count = ATOMIC_INIT(0) },
225#endif
226};
227EXPORT_SYMBOL(init_task);
228
229/*
230 * Initial thread structure. Alignment of this is handled by a special
231 * linker map entry.
232 */
233#ifndef CONFIG_THREAD_INFO_IN_TASK
234struct thread_info init_thread_info __init_thread_info = INIT_THREAD_INFO(init_task);
235#endif
236