cregit-Linux how code gets into the kernel

Release 4.16 kernel/exit.c

Directory: kernel
/*
 *  linux/kernel/exit.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/sched/autogroup.h>
#include <linux/sched/mm.h>
#include <linux/sched/stat.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/sched/cputime.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/capability.h>
#include <linux/completion.h>
#include <linux/personality.h>
#include <linux/tty.h>
#include <linux/iocontext.h>
#include <linux/key.h>
#include <linux/cpu.h>
#include <linux/acct.h>
#include <linux/tsacct_kern.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/freezer.h>
#include <linux/binfmts.h>
#include <linux/nsproxy.h>
#include <linux/pid_namespace.h>
#include <linux/ptrace.h>
#include <linux/profile.h>
#include <linux/mount.h>
#include <linux/proc_fs.h>
#include <linux/kthread.h>
#include <linux/mempolicy.h>
#include <linux/taskstats_kern.h>
#include <linux/delayacct.h>
#include <linux/cgroup.h>
#include <linux/syscalls.h>
#include <linux/signal.h>
#include <linux/posix-timers.h>
#include <linux/cn_proc.h>
#include <linux/mutex.h>
#include <linux/futex.h>
#include <linux/pipe_fs_i.h>
#include <linux/audit.h> /* for audit_free() */
#include <linux/resource.h>
#include <linux/blkdev.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/tracehook.h>
#include <linux/fs_struct.h>
#include <linux/init_task.h>
#include <linux/perf_event.h>
#include <trace/events/sched.h>
#include <linux/hw_breakpoint.h>
#include <linux/oom.h>
#include <linux/writeback.h>
#include <linux/shm.h>
#include <linux/kcov.h>
#include <linux/random.h>
#include <linux/rcuwait.h>
#include <linux/compat.h>

#include <linux/uaccess.h>
#include <asm/unistd.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>


static void __unhash_process(struct task_struct *p, bool group_dead) { nr_threads--; detach_pid(p, PIDTYPE_PID); if (group_dead) { detach_pid(p, PIDTYPE_PGID); detach_pid(p, PIDTYPE_SID); list_del_rcu(&p->tasks); list_del_init(&p->sibling); __this_cpu_dec(process_counts); } list_del_rcu(&p->thread_group); list_del_rcu(&p->thread_node); }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov4251.85%646.15%
Ingo Molnar1619.75%17.69%
Al Viro1518.52%17.69%
Andrew Morton56.17%215.38%
Eric W. Biedermann22.47%215.38%
Christoph Lameter11.23%17.69%
Total81100.00%13100.00%

/* * This function expects the tasklist_lock write-locked. */
static void __exit_signal(struct task_struct *tsk) { struct signal_struct *sig = tsk->signal; bool group_dead = thread_group_leader(tsk); struct sighand_struct *sighand; struct tty_struct *uninitialized_var(tty); u64 utime, stime; sighand = rcu_dereference_check(tsk->sighand, lockdep_tasklist_lock_is_held()); spin_lock(&sighand->siglock); #ifdef CONFIG_POSIX_TIMERS posix_cpu_timers_exit(tsk); if (group_dead) { posix_cpu_timers_exit_group(tsk); } else { /* * This can only happen if the caller is de_thread(). * FIXME: this is the temporary hack, we should teach * posix-cpu-timers to handle this case correctly. */ if (unlikely(has_group_leader_pid(tsk))) posix_cpu_timers_exit_group(tsk); } #endif if (group_dead) { tty = sig->tty; sig->tty = NULL; } else { /* * If there is any task waiting for the group exit * then notify it: */ if (sig->notify_count > 0 && !--sig->notify_count) wake_up_process(sig->group_exit_task); if (tsk == sig->curr_target) sig->curr_target = next_thread(tsk); } add_device_randomness((const void*) &tsk->se.sum_exec_runtime, sizeof(unsigned long long)); /* * Accumulate here the counters for all threads as they die. We could * skip the group leader because it is the last user of signal_struct, * but we want to avoid the race with thread_group_cputime() which can * see the empty ->thread_head list. */ task_cputime(tsk, &utime, &stime); write_seqlock(&sig->stats_lock); sig->utime += utime; sig->stime += stime; sig->gtime += task_gtime(tsk); sig->min_flt += tsk->min_flt; sig->maj_flt += tsk->maj_flt; sig->nvcsw += tsk->nvcsw; sig->nivcsw += tsk->nivcsw; sig->inblock += task_io_get_inblock(tsk); sig->oublock += task_io_get_oublock(tsk); task_io_accounting_add(&sig->ioac, &tsk->ioac); sig->sum_sched_runtime += tsk->se.sum_exec_runtime; sig->nr_threads--; __unhash_process(tsk, group_dead); write_sequnlock(&sig->stats_lock); /* * Do this under ->siglock, we can race with another thread * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals. */ flush_sigqueue(&tsk->pending); tsk->sighand = NULL; spin_unlock(&sighand->siglock); __cleanup_sighand(sighand); clear_tsk_thread_flag(tsk, TIF_SIGPENDING); if (group_dead) { flush_sigqueue(&sig->shared_pending); tty_kref_put(tty); } }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov23161.44%1244.44%
Nico Pitre4812.77%27.41%
Frédéric Weisbecker195.05%27.41%
Peter Zijlstra174.52%13.70%
Rik Van Riel174.52%27.41%
Eric Dumazet174.52%13.70%
Andrea Righi133.46%27.41%
Laurent Vivier51.33%13.70%
Paul E. McKenney41.06%27.41%
Martin Schwidefsky30.80%13.70%
Hidetoshi Seto20.53%13.70%
Total376100.00%27100.00%


static void delayed_put_task_struct(struct rcu_head *rhp) { struct task_struct *tsk = container_of(rhp, struct task_struct, rcu); perf_event_delayed_put(tsk); trace_sched_process_free(tsk); put_task_struct(tsk); }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann2253.66%125.00%
Mathieu Desnoyers1434.15%125.00%
Ingo Molnar49.76%125.00%
Peter Zijlstra12.44%125.00%
Total41100.00%4100.00%


void release_task(struct task_struct *p) { struct task_struct *leader; int zap_leader; repeat: /* don't need to get the RCU readlock here - the process is dead and * can't be modifying its own credentials. But shut RCU-lockdep up */ rcu_read_lock(); atomic_dec(&__task_cred(p)->user->processes); rcu_read_unlock(); proc_flush_task(p); write_lock_irq(&tasklist_lock); ptrace_release_task(p); __exit_signal(p); /* * If we are the last non-leader member of the thread * group, and the leader is zombie, then notify the * group leader's parent process. (if it wants notification.) */ zap_leader = 0; leader = p->group_leader; if (leader != p && thread_group_empty(leader) && leader->exit_state == EXIT_ZOMBIE) { /* * If we were the last child thread and the leader has * exited already, and the leader's parent ignores SIGCHLD, * then we are the one who should release the leader. */ zap_leader = do_notify_parent(leader, leader->exit_signal); if (zap_leader) leader->exit_state = EXIT_DEAD; } write_unlock_irq(&tasklist_lock); release_thread(p); call_rcu(&p->rcu, delayed_put_task_struct); p = leader; if (unlikely(zap_leader)) goto repeat; }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar5839.19%626.09%
Linus Torvalds2718.24%28.70%
Linus Torvalds (pre-git)2516.89%730.43%
Roland McGrath106.76%14.35%
Paul E. McKenney74.73%14.35%
Eric W. Biedermann64.05%14.35%
Pavel Emelyanov53.38%14.35%
Andrew Morton32.03%14.35%
Oleg Nesterov32.03%14.35%
David Howells32.03%14.35%
Tejun Heo10.68%14.35%
Total148100.00%23100.00%

/* * Note that if this function returns a valid task_struct pointer (!NULL) * task->usage must remain >0 for the duration of the RCU critical section. */
struct task_struct *task_rcu_dereference(struct task_struct **ptask) { struct sighand_struct *sighand; struct task_struct *task; /* * We need to verify that release_task() was not called and thus * delayed_put_task_struct() can't run and drop the last reference * before rcu_read_unlock(). We check task->sighand != NULL, * but we can read the already freed and reused memory. */ retry: task = rcu_dereference(*ptask); if (!task) return NULL; probe_kernel_address(&task->sighand, sighand); /* * Pairs with atomic_dec_and_test() in put_task_struct(). If this task * was already freed we can not miss the preceding update of this * pointer. */ smp_rmb(); if (unlikely(task != READ_ONCE(*ptask))) goto retry; /* * We've re-checked that "task == *ptask", now we have two different * cases: * * 1. This is actually the same task/task_struct. In this case * sighand != NULL tells us it is still alive. * * 2. This is another task which got the same memory for task_struct. * We can't know this of course, and we can not trust * sighand != NULL. * * In this case we actually return a random value, but this is * correct. * * If we return NULL - we can pretend that we actually noticed that * *ptask was updated when the previous task has exited. Or pretend * that probe_slab_address(&sighand) reads NULL. * * If we return the new task (because sighand is not NULL for any * reason) - this is fine too. This (new) task can't go away before * another gp pass. * * And note: We could even eliminate the false positive if re-read * task->sighand once again to avoid the falsely NULL. But this case * is very unlikely so we don't care. */ if (!sighand) return NULL; return task; }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov84100.00%1100.00%
Total84100.00%1100.00%


void rcuwait_wake_up(struct rcuwait *w) { struct task_struct *task; rcu_read_lock(); /* * Order condition vs @task, such that everything prior to the load * of @task is visible. This is the condition as to why the user called * rcuwait_trywake() in the first place. Pairs with set_current_state() * barrier (A) in rcuwait_wait_event(). * * WAIT WAKE * [S] tsk = current [S] cond = true * MB (A) MB (B) * [L] cond [L] tsk */ smp_rmb(); /* (B) */ /* * Avoid using task_rcu_dereference() magic as long as we are careful, * see comment in rcuwait_wait_event() regarding ->exit_state. */ task = rcu_dereference(w->task); if (task) wake_up_process(task); rcu_read_unlock(); }

Contributors

PersonTokensPropCommitsCommitProp
Davidlohr Bueso A45100.00%1100.00%
Total45100.00%1100.00%

/* * Determine if a process group is "orphaned", according to the POSIX * definition in 2.2.2.52. Orphaned process groups are not to be affected * by terminal-generated stop signals. Newly orphaned process groups are * to receive a SIGHUP and a SIGCONT. * * "I ask you, have you ever known what it is to be an orphan?" */
static int will_become_orphaned_pgrp(struct pid *pgrp, struct task_struct *ignored_task) { struct task_struct *p; do_each_pid_task(pgrp, PIDTYPE_PGID, p) { if ((p == ignored_task) || (p->exit_state && thread_group_empty(p)) || is_global_init(p->real_parent)) continue; if (task_pgrp(p->real_parent) != pgrp && task_session(p->real_parent) == task_session(p)) return 0; } while_each_pid_task(pgrp, PIDTYPE_PGID, p); return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4546.88%423.53%
Oleg Nesterov1212.50%15.88%
Ingo Molnar1010.42%423.53%
Kirill Korotaev88.33%15.88%
Eric W. Biedermann88.33%15.88%
Cédric Le Goater44.17%15.88%
Andrew Morton33.12%211.76%
Daniel Jacobowitz33.12%15.88%
Sukadev Bhattiprolu22.08%15.88%
Serge E. Hallyn11.04%15.88%
Total96100.00%17100.00%


int is_current_pgrp_orphaned(void) { int retval; read_lock(&tasklist_lock); retval = will_become_orphaned_pgrp(task_pgrp(current), NULL); read_unlock(&tasklist_lock); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar2054.05%116.67%
Linus Torvalds (pre-git)924.32%233.33%
Eric W. Biedermann616.22%233.33%
Andrew Morton25.41%116.67%
Total37100.00%6100.00%


static bool has_stopped_jobs(struct pid *pgrp) { struct task_struct *p; do_each_pid_task(pgrp, PIDTYPE_PGID, p) { if (p->signal->flags & SIGNAL_STOP_STOPPED) return true; } while_each_pid_task(pgrp, PIDTYPE_PGID, p); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1937.25%225.00%
Oleg Nesterov1121.57%112.50%
Kirill Korotaev815.69%112.50%
Ingo Molnar713.73%225.00%
Eric W. Biedermann59.80%112.50%
Andrew Morton11.96%112.50%
Total51100.00%8100.00%

/* * Check to see if any process groups have become orphaned as * a result of our exiting, and if they have any stopped jobs, * send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) */
static void kill_orphaned_pgrp(struct task_struct *tsk, struct task_struct *parent) { struct pid *pgrp = task_pgrp(tsk); struct task_struct *ignored_task = tsk; if (!parent) /* exit: our father is in a different pgrp than * we are and we were the only connection outside. */ parent = tsk->real_parent; else /* reparent: our child is in a different pgrp than * we are, and it was the only connection outside. */ ignored_task = NULL; if (task_pgrp(parent) != pgrp && task_session(parent) == task_session(tsk) && will_become_orphaned_pgrp(pgrp, ignored_task) && has_stopped_jobs(pgrp)) { __kill_pgrp_info(SIGHUP, SEND_SIG_PRIV, pgrp); __kill_pgrp_info(SIGCONT, SEND_SIG_PRIV, pgrp); } }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov10199.02%150.00%
Ionut Alexa10.98%150.00%
Total102100.00%2100.00%

#ifdef CONFIG_MEMCG /* * A task is exiting. If it owned this mm, find a new owner for the mm. */
void mm_update_next_owner(struct mm_struct *mm) { struct task_struct *c, *g, *p = current; retry: /* * If the exiting or execing task is not the owner, it's * someone else's problem. */ if (mm->owner != p) return; /* * The current owner is exiting/execing and there are no other * candidates. Do not leave the mm pointing to a possibly * freed task structure. */ if (atomic_read(&mm->mm_users) <= 1) { mm->owner = NULL; return; } read_lock(&tasklist_lock); /* * Search in the children */ list_for_each_entry(c, &p->children, sibling) { if (c->mm == mm) goto assign_new_owner; } /* * Search in the siblings */ list_for_each_entry(c, &p->real_parent->children, sibling) { if (c->mm == mm) goto assign_new_owner; } /* * Search through everything else, we should not get here often. */ for_each_process(g) { if (g->flags & PF_KTHREAD) continue; for_each_thread(g, c) { if (c->mm == mm) goto assign_new_owner; if (c->mm) break; } } read_unlock(&tasklist_lock); /* * We found no owner yet mm_users > 1: this implies that we are * most likely racing with swapoff (try_to_unuse()) or /proc or * ptrace or page migration (get_task_mm()). Mark owner as NULL. */ mm->owner = NULL; return; assign_new_owner: BUG_ON(c == p); get_task_struct(c); /* * The task_lock protects c->mm from changing. * We always want mm->owner->mm == mm */ task_lock(c); /* * Delay read_unlock() till we have the task_lock() * to ensure that c does not slip away underneath us */ read_unlock(&tasklist_lock); if (c->mm != mm) { task_unlock(c); put_task_struct(c); goto retry; } mm->owner = c; task_unlock(c); put_task_struct(c); }

Contributors

PersonTokensPropCommitsCommitProp
Balbir Singh17074.24%228.57%
Oleg Nesterov2711.79%342.86%
Kamezawa Hiroyuki2510.92%114.29%
Hugh Dickins73.06%114.29%
Total229100.00%7100.00%

#endif /* CONFIG_MEMCG */ /* * Turn us into a lazy TLB process if we * aren't already.. */
static void exit_mm(void) { struct mm_struct *mm = current->mm; struct core_state *core_state; mm_release(current, mm); if (!mm) return; sync_mm_rss(mm); /* * Serialize with any possible pending coredump. * We must hold mmap_sem around checking core_state * and clearing tsk->mm. The core-inducing thread * will increment ->nr_threads for each thread in the * group with ->mm != NULL. */ down_read(&mm->mmap_sem); core_state = mm->core_state; if (core_state) { struct core_thread self; up_read(&mm->mmap_sem); self.task = current; self.next = xchg(&core_state->dumper.next, &self); /* * Implies mb(), the result of xchg() must be visible * to core_state->dumper. */ if (atomic_dec_and_test(&core_state->nr_threads)) complete(&core_state->startup); for (;;) { set_current_state(TASK_UNINTERRUPTIBLE); if (!self.task) /* see coredump_finish() */ break; freezable_schedule(); } __set_current_state(TASK_RUNNING); down_read(&mm->mmap_sem); } mmgrab(mm); BUG_ON(mm != current->active_mm); /* more a memory barrier than a real lock */ task_lock(current); current->mm = NULL; up_read(&mm->mmap_sem); enter_lazy_tlb(mm, current); task_unlock(current); mm_update_next_owner(mm); mmput(mm); if (test_thread_flag(TIF_MEMDIE)) exit_oom_victim(); }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov6529.82%616.67%
Linus Torvalds (pre-git)4922.48%1336.11%
Andrew Morton3214.68%12.78%
Ingo Molnar2611.93%25.56%
Davidlohr Bueso A104.59%25.56%
Michal Hocko73.21%12.78%
Linus Torvalds62.75%12.78%
Balbir Singh52.29%12.78%
Konstantin Khlebnikov52.29%12.78%
Robert Love41.83%12.78%
Eric Sesterhenn / Snakebyte31.38%12.78%
Vegard Nossum10.46%12.78%
David Rientjes10.46%12.78%
Tetsuo Handa10.46%12.78%
Johannes Weiner10.46%12.78%
Adrian Bunk10.46%12.78%
Mandeep Singh Baines10.46%12.78%
Total218100.00%36100.00%


static struct task_struct *find_alive_thread(struct task_struct *p) { struct task_struct *t; for_each_thread(p, t) { if (!(t->flags & PF_EXITING)) return t; } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov43100.00%1100.00%
Total43100.00%1100.00%


static struct task_struct *find_child_reaper(struct task_struct *father) __releases(&tasklist_lock

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov1178.57%266.67%
Namhyung Kim321.43%133.33%
Total14100.00%3100.00%

) __acquires(&tasklist_lock) { struct pid_namespace *pid_ns = task_active_pid_ns(father); struct task_struct *reaper = pid_ns->child_reaper; if (likely(reaper != father)) return reaper; reaper = find_alive_thread(father); if (reaper) { pid_ns->child_reaper = reaper; return reaper; } write_unlock_irq(&tasklist_lock); if (unlikely(pid_ns == &init_pid_ns)) { panic("Attempted to kill init! exitcode=0x%08x\n", father->signal->group_exit_code ?: father->exit_code); } zap_pid_ns_processes(pid_ns); write_lock_irq(&tasklist_lock); return father; } /* * When we die, we re-parent all our children, and try to: * 1. give them to another thread in our thread group, if such a member exists * 2. give it to the first ancestor process which prctl'd itself as a * child_subreaper for its children (like a service manager) * 3. give it to the init process (PID 1) in our pid namespace */
static struct task_struct *find_new_reaper(struct task_struct *father, struct task_struct *child_reaper) { struct task_struct *thread, *reaper; thread = find_alive_thread(father); if (thread) return thread; if (father->signal->has_child_subreaper) { unsigned int ns_level = task_pid(father)->level; /* * Find the first ->is_child_subreaper ancestor in our pid_ns. * We can't check reaper != child_reaper to ensure we do not * cross the namespaces, the exiting parent could be injected * by setns() + fork(). * We check pid->level, this is slightly more efficient than * task_active_pid_ns(reaper) != task_active_pid_ns(father). */ for (reaper = father->real_parent; task_pid(reaper)->level == ns_level; reaper = reaper->real_parent) { if (reaper == &init_task) break; if (!reaper->signal->is_child_subreaper) continue; thread = find_alive_thread(reaper); if (thread) return thread; } } return child_reaper; }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov7460.66%787.50%
Lennart Poettering4839.34%112.50%
Total122100.00%8100.00%

/* * Any that need to be release_task'd are put on the @dead list. */
static void reparent_leader(struct task_struct *father, struct task_struct *p, struct list_head *dead) { if (unlikely(p->exit_state == EXIT_DEAD)) return; /* We don't want people slaying init. */ p->exit_signal = SIGCHLD; /* If it has exited notify the new parent about this child's death. */ if (!p->ptrace && p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) { if (do_notify_parent(p, p->exit_signal)) { p->exit_state = EXIT_DEAD; list_add(&p->ptrace_entry, dead); } } kill_orphaned_pgrp(p, father); }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov9597.94%787.50%
Tejun Heo22.06%112.50%
Total97100.00%8100.00%

/* * This does two things: * * A. Make init inherit all the child processes * B. Check to see if any process groups have become orphaned * as a result of our exiting, and if they have any stopped * jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) */
static void forget_original_parent(struct task_struct *father, struct list_head *dead) { struct task_struct *p, *t, *reaper; if (unlikely(!list_empty(&father->ptraced))) exit_ptrace(father, dead); /* Can drop and reacquire tasklist_lock */ reaper = find_child_reaper(father); if (list_empty(&father->children)) return; reaper = find_new_reaper(father, reaper); list_for_each_entry(p, &father->children, sibling) { for_each_thread(p, t) { t->real_parent = reaper; BUG_ON((!t->ptrace) != (t->parent == father)); if (likely(!t->ptrace)) t->parent = t->real_parent; if (t->pdeath_signal) group_send_sig_info(t->pdeath_signal, SEND_SIG_NOINFO, t); } /* * If this is a threaded reparent there is no need to * notify anyone anything has happened. */ if (!same_thread_group(reaper, father)) reparent_leader(father, p, dead); } list_splice_tail_init(&father->children, &reaper->children); }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov13974.73%1376.47%
Daniel Jacobowitz2815.05%15.88%
Roland McGrath158.06%15.88%
Matthias Kaehlcke21.08%15.88%
Tejun Heo21.08%15.88%
Total186100.00%17100.00%

/* * Send signals to all our closest relatives so that they know * to properly mourn us.. */
static void exit_notify(struct task_struct *tsk, int group_dead) { bool autoreap; struct task_struct *p, *n; LIST_HEAD(dead); write_lock_irq(&tasklist_lock); forget_original_parent(tsk, &dead); if (group_dead) kill_orphaned_pgrp(tsk->group_leader, NULL); if (unlikely(tsk->ptrace)) { int sig = thread_group_leader(tsk) && thread_group_empty(tsk) && !ptrace_reparented(tsk) ? tsk->exit_signal : SIGCHLD; autoreap = do_notify_parent(tsk, sig); } else if (thread_group_leader(tsk)) { autoreap = thread_group_empty(tsk) && do_notify_parent(tsk, tsk->exit_signal); } else { autoreap = true; } tsk->exit_state = autoreap ? EXIT_DEAD : EXIT_ZOMBIE; if (tsk->exit_state == EXIT_DEAD) list_add(&tsk->ptrace_entry, &dead); /* mt-exec, de_thread() is waiting for group leader */ if (unlikely(tsk->signal->notify_count < 0)) wake_up_process(tsk->signal->group_exit_task); write_unlock_irq(&tasklist_lock); list_for_each_entry_safe(p, n, &dead, ptrace_entry) { list_del_init(&p->ptrace_entry); release_task(p); } }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov16073.39%1037.04%
Ingo Molnar125.50%414.81%
Roland McGrath115.05%311.11%
Andrew Morton73.21%13.70%
Daniel Jacobowitz73.21%311.11%
Linus Torvalds62.75%13.70%
Linus Torvalds (pre-git)62.75%27.41%
Andrea Arcangeli41.83%13.70%
Steve VanDeBogart31.38%13.70%
Eric W. Biedermann20.92%13.70%
Total218100.00%27100.00%

#ifdef CONFIG_DEBUG_STACK_USAGE
static void check_stack_usage(void) { static DEFINE_SPINLOCK(low_water_lock); static int lowest_to_date = THREAD_SIZE; unsigned long free; free = stack_not_used(current); if (free >= lowest_to_date) return; spin_lock(&low_water_lock); if (free < lowest_to_date) { pr_info("%s (%d) used greatest stack depth: %lu bytes left\n", current->comm, task_pid_nr(current), free); lowest_to_date = free; } spin_unlock(&low_water_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike7089.74%120.00%
Tim Bird56.41%120.00%
Anton Blanchard11.28%120.00%
Eric Sandeen11.28%120.00%
Ionut Alexa11.28%120.00%
Total78100.00%5100.00%

#else
static inline void check_stack_usage(void) {}

Contributors

PersonTokensPropCommitsCommitProp
Jeff Dike8100.00%1100.00%
Total8100.00%1100.00%

#endif
void __noreturn do_exit(long code) { struct task_struct *tsk = current; int group_dead; profile_task_exit(tsk); kcov_task_exit(tsk); WARN_ON(blk_needs_flush_plug(tsk)); if (unlikely(in_interrupt())) panic("Aiee, killing interrupt handler!"); if (unlikely(!tsk->pid)) panic("Attempted to kill the idle task!"); /* * If do_exit is called because this processes oopsed, it's possible * that get_fs() was left as KERNEL_DS, so reset it to USER_DS before * continuing. Amongst other possible reasons, this is to prevent * mm_release()->clear_child_tid() from writing to a user-controlled * kernel address. */ set_fs(USER_DS); ptrace_event(PTRACE_EVENT_EXIT, code); validate_creds_for_do_exit(tsk); /* * We're taking recursive faults here in do_exit. Safest is to just * leave this task alone and wait for reboot. */ if (unlikely(tsk->flags & PF_EXITING)) { pr_alert("Fixing recursive fault but reboot is needed!\n"); /* * We can do this unlocked here. The futex code uses * this flag just to verify whether the pi state * cleanup has been done or not. In the worst case it * loops once more. We pretend that the cleanup was * done as there is no way to return. Either the * OWNER_DIED bit is set by now or we push the blocked * task into the wait for ever nirwana as well. */ tsk->flags |= PF_EXITPIDONE; set_current_state(TASK_UNINTERRUPTIBLE); schedule(); } exit_signals(tsk); /* sets PF_EXITING */ /* * Ensure that all new tsk->pi_lock acquisitions must observe * PF_EXITING. Serializes against futex.c:attach_to_pi_owner(). */ smp_mb(); /* * Ensure that we must observe the pi_state in exit_mm() -> * mm_release() -> exit_pi_state_list(). */ raw_spin_lock_irq(&tsk->pi_lock); raw_spin_unlock_irq(&tsk->pi_lock); if (unlikely(in_atomic())) { pr_info("note: %s[%d] exited with preempt_count %d\n", current->comm, task_pid_nr(current), preempt_count()); preempt_count_set(PREEMPT_ENABLED); } /* sync mm's RSS info before statistics gathering */ if (tsk->mm) sync_mm_rss(tsk->mm); acct_update_integrals(tsk); group_dead = atomic_dec_and_test(&tsk->signal->live); if (group_dead) { #ifdef CONFIG_POSIX_TIMERS hrtimer_cancel(&tsk->signal->real_timer); exit_itimers(tsk->signal); #endif if (tsk->mm) setmax_mm_hiwater_rss(&tsk->signal->maxrss, tsk->mm); } acct_collect(code, group_dead); if (group_dead) tty_audit_exit(); audit_free(tsk); tsk->exit_code = code; taskstats_exit(tsk, group_dead); exit_mm(); if (group_dead) acct_process(); trace_sched_process_exit(tsk); exit_sem(tsk); exit_shm(tsk); exit_files(tsk); exit_fs(tsk); if (group_dead) disassociate_ctty(1); exit_task_namespaces(tsk); exit_task_work(tsk); exit_thread(tsk); /* * Flush inherited counters to the parent - before the parent * gets woken up by child-exit notifications. * * because of cgroup mode, must be called before cgroup_exit() */ perf_event_exit_task(tsk); sched_autogroup_exit_task(tsk); cgroup_exit(tsk); /* * FIXME: do that only when needed, using sched_exit tracepoint */ flush_ptrace_hw_breakpoint(tsk); exit_tasks_rcu_start(); exit_notify(tsk, group_dead); proc_exit_connector(tsk); mpol_put_task_policy(tsk); #ifdef CONFIG_FUTEX if (unlikely(current->pi_state_cache)) kfree(current->pi_state_cache); #endif /* * Make sure we are holding no locks: */ debug_check_no_locks_held(); /* * We can do this unlocked here. The futex code uses this flag * just to verify whether the pi state cleanup has been done * or not. In the worst case it loops once more. */ tsk->flags |= PF_EXITPIDONE; if (tsk->io_context) exit_io_context(tsk); if (tsk->splice_pipe) free_pipe_info(tsk->splice_pipe); if (tsk->task_frag.page) put_page(tsk->task_frag.page); validate_creds_for_do_exit(tsk); check_stack_usage(); preempt_disable(); if (tsk->nr_dirtied) __this_cpu_add(dirty_throttle_leaks, tsk->nr_dirtied); exit_rcu(); exit_tasks_rcu_finish(); lockdep_free_task(tsk); do_task_dead(); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)469.18%88.89%
Oleg Nesterov407.98%1112.22%
Roland McGrath295.79%44.44%
Alexander Nyberg265.19%11.11%
Al Viro234.59%55.56%
Alexey Kuznetsov214.19%11.11%
Jens Axboe203.99%33.33%
Ingo Molnar203.99%44.44%
Jiri Pirko203.99%11.11%
Robert Love203.99%33.33%
Paul E. McKenney183.59%55.56%
Eric Dumazet173.39%11.11%
Fengguang Wu152.99%11.11%
Andrew Morton142.79%22.22%
KaiGai Kohei142.79%22.22%
Linus Torvalds122.40%11.11%
Peter Zijlstra112.20%33.33%
David Howells102.00%11.11%
Kamezawa Hiroyuki81.60%22.22%
Dave Jones71.40%11.11%
Stéphane Eranian61.20%11.11%
Nelson Elhage61.20%11.11%
Shailabh Nagar61.20%22.22%
Dmitriy Vyukov51.00%11.11%
Miloslav Trmač51.00%11.11%
Mathieu Desnoyers51.00%11.11%
Byungchul Park51.00%11.11%
John Levon51.00%11.11%
Rik Van Riel51.00%11.11%
Alexey Dobriyan51.00%11.11%
Frédéric Weisbecker51.00%11.11%
Paul Menage51.00%11.11%
Vasiliy Kulikov51.00%11.11%
Guillaume Morin51.00%11.11%
Nico Pitre51.00%11.11%
Miao Xie40.80%11.11%
Cédric Le Goater40.80%11.11%
Pavel Emelyanov30.60%11.11%
Coywolf Qi Hunt30.60%11.11%
Louis Rilling30.60%11.11%
Jiri Slaby30.60%11.11%
Tejun Heo30.60%11.11%
Alan Cox20.40%11.11%
Ionut Alexa20.40%11.11%
Serge E. Hallyn10.20%11.11%
David Rientjes10.20%11.11%
Davidlohr Bueso A10.20%11.11%
Colin Cross10.20%11.11%
Thomas Gleixner10.20%11.11%
Total501100.00%90100.00%

EXPORT_SYMBOL_GPL(do_exit);
void complete_and_exit(struct completion *comp, long code) { if (comp) complete(comp); do_exit(code); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2177.78%150.00%
Linus Torvalds622.22%150.00%
Total27100.00%2100.00%

EXPORT_SYMBOL(complete_and_exit); SYSCALL_DEFINE1(exit, int, error_code) { do_exit((error_code&0xff)<<8); } /* * Take down every thread in the group. This is called by fatal signals * as well as by sys_exit_group (below). */
void do_group_exit(int exit_code) { struct signal_struct *sig = current->signal; BUG_ON(exit_code & 0x80); /* core dumps don't get here */ if (signal_group_exit(sig)) exit_code = sig->group_exit_code; else if (!thread_group_empty(current)) { struct sighand_struct *const sighand = current->sighand; spin_lock_irq(&sighand->siglock); if (signal_group_exit(sig)) /* Another thread got here before we took the lock. */ exit_code = sig->group_exit_code; else { sig->group_exit_code = exit_code; sig->flags = SIGNAL_GROUP_EXIT; zap_other_threads(current); } spin_unlock_irq(&sighand->siglock); } do_exit(exit_code); /* NOTREACHED */ }

Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar8271.30%457.14%
Oleg Nesterov2320.00%228.57%
Linus Torvalds108.70%114.29%
Total115100.00%7100.00%

/* * this kills every thread in the thread group. Note that any externally * wait4()-ing process will get the correct exit code - even if this * thread is not the thread group leader. */ SYSCALL_DEFINE1(exit_group, int, error_code) { do_group_exit((error_code & 0xff) << 8); /* NOTREACHED */ return 0; } struct waitid_info { pid_t pid; uid_t uid; int status; int cause; }; struct wait_opts { enum pid_type wo_type; int wo_flags; struct pid *wo_pid; struct waitid_info *wo_info; int wo_stat; struct rusage *wo_rusage; wait_queue_entry_t child_wait; int notask_error; };
static inline struct pid *task_pid_type(struct task_struct *task, enum pid_type type) { if (type != PIDTYPE_PID) task = task->group_leader; return task->pids[type].pid; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann2665.00%125.00%
Daniel Jacobowitz717.50%125.00%
Oleg Nesterov512.50%125.00%
Ingo Molnar25.00%125.00%
Total40100.00%4100.00%


static int eligible_pid(struct wait_opts *wo, struct task_struct *p) { return wo->wo_type == PIDTYPE_MAX || task_pid_type(p, wo->wo_type) == wo->wo_pid; }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov1850.00%233.33%
Eric W. Biedermann1336.11%116.67%
Andrew Morton25.56%116.67%
Daniel Jacobowitz25.56%116.67%
Pavel Emelyanov12.78%116.67%
Total36100.00%6100.00%


static int eligible_child(struct wait_opts *wo, bool ptrace, struct task_struct *p) { if (!eligible_pid(wo, p)) return 0; /* * Wait for all children (clone and not) if __WALL is set or * if it is traced by us. */ if (ptrace || (wo->wo_flags & __WALL)) return 1; /* * Otherwise, wait for clone children *only* if __WCLONE is set; * otherwise, wait for non-clone children *only*. * * Note: a "clone" child here is one that reports to its parent * using a signal other than SIGCHLD, or a non-leader thread which * we can only see if it is traced by us. */ if ((p->exit_signal != SIGCHLD) ^ !!(wo->wo_flags & __WCLONE)) return 0; return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov4965.33%466.67%
Daniel Jacobowitz2533.33%116.67%
Roland McGrath11.33%116.67%
Total75100.00%6100.00%

/* * Handle sys_wait4 work for one task in state EXIT_ZOMBIE. We hold * read_lock(&tasklist_lock) on entry. If we return zero, we still hold * the lock and this task is uninteresting. If we return nonzero, we have * released the lock and the system call should return. */
static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p) { int state, status; pid_t pid = task_pid_vnr(p); uid_t uid = from_kuid_munged(current_user_ns(), task_uid(p)); struct waitid_info *infop; if (!likely(wo->wo_flags & WEXITED)) return 0; if (unlikely(wo->wo_flags & WNOWAIT)) { status = p->exit_code; get_task_struct(p); read_unlock(&tasklist_lock); sched_annotate_sleep(); if (wo->wo_rusage) getrusage(p, RUSAGE_BOTH, wo->wo_rusage); put_task_struct(p); goto out_info; } /* * Move the task's state to DEAD/TRACE, only one thread can do this. */ state = (ptrace_reparented(p) && thread_group_leader(p)) ? EXIT_TRACE : EXIT_DEAD; if (cmpxchg(&p->exit_state, EXIT_ZOMBIE, state) != EXIT_ZOMBIE) return 0; /* * We own this thread, nobody else can reap it. */ read_unlock(&tasklist_lock); sched_annotate_sleep(); /* * Check thread_group_leader() to exclude the traced sub-threads. */ if (state == EXIT_DEAD && thread_group_leader(p)) { struct signal_struct *sig = p->signal; struct signal_struct *psig = current->signal; unsigned long maxrss; u64 tgutime, tgstime; /* * The resource counters for the group leader are in its * own task_struct. Those for dead threads in the group * are in its signal_struct, as are those for the child * processes it has previously reaped. All these * accumulate in the parent's signal_struct c* fields. * * We don't bother to take a lock here to protect these * p->signal fields because the whole thread group is dead * and nobody can change them. * * psig->stats_lock also protects us from our sub-theads * which can reap other children at the same time. Until * we change k_getrusage()-like users to rely on this lock * we have to take ->siglock as well. * * We use thread_group_cputime_adjusted() to get times for * the thread group, which consolidates times for all threads * in the group including the group leader. */ thread_group_cputime_adjusted(p, &tgutime, &tgstime); spin_lock_irq(&current->sighand->siglock); write_seqlock(&psig->stats_lock); psig->cutime += tgutime + sig->cutime; psig->cstime += tgstime + sig->cstime; psig->cgtime += task_gtime(p) + sig->gtime + sig->cgtime; psig->cmin_flt += p->min_flt + sig->min_flt + sig->cmin_flt; psig->cmaj_flt += p->maj_flt + sig->maj_flt + sig->cmaj_flt; psig->cnvcsw += p->nvcsw + sig->nvcsw + sig->cnvcsw; psig->cnivcsw += p->nivcsw + sig->nivcsw + sig->cnivcsw; psig->cinblock += task_io_get_inblock(p) + sig->inblock + sig->cinblock; psig->coublock += task_io_get_oublock(p) + sig->oublock + sig->coublock; maxrss = max(sig->maxrss, sig->cmaxrss); if (psig->cmaxrss < maxrss) psig->cmaxrss = maxrss; task_io_accounting_add(&psig->ioac, &p->ioac); task_io_accounting_add(&psig->ioac, &sig->ioac); write_sequnlock(&psig->stats_lock); spin_unlock_irq(&current->sighand->siglock); } if (wo->wo_rusage) getrusage(p, RUSAGE_BOTH, wo->wo_rusage); status = (p->signal->flags & SIGNAL_GROUP_EXIT) ? p->signal->group_exit_code : p->exit_code; wo->wo_stat = status; if (state == EXIT_TRACE) { write_lock_irq(&tasklist_lock); /* We dropped tasklist, ptracer could die and untrace */ ptrace_unlink(p); /* If parent wants a zombie, don't release it now */ state = EXIT_ZOMBIE; if (do_notify_parent(p, p->exit_signal)) state = EXIT_DEAD; p->exit_state = state; write_unlock_irq(&tasklist_lock); } if (state == EXIT_DEAD) release_task(p); out_info: infop = wo->wo_info; if (infop) { if ((status & 0x7f) == 0) { infop->cause = CLD_EXITED; infop->status = status >> 8; } else { infop->cause = (status & 0x80) ? CLD_DUMPED : CLD_KILLED; infop->status = status & 0x7f; } infop->pid = pid; infop->uid = uid; } return pid; }

Contributors

PersonTokensPropCommitsCommitProp
Roland McGrath21734.23%510.00%
Oleg Nesterov9815.46%1122.00%
Al Viro8713.72%510.00%
Eric Dumazet345.36%12.00%
Jiri Pirko314.89%12.00%
Andrea Righi264.10%24.00%
Jesper Juhl243.79%12.00%
Ingo Molnar203.15%510.00%
Linus Torvalds (pre-git)193.00%612.00%
Hidetoshi Seto162.52%12.00%
Rik Van Riel162.52%12.00%
David Howells111.74%24.00%
Laurent Vivier111.74%12.00%
Martin Schwidefsky71.10%12.00%
Eric W. Biedermann60.95%12.00%
Frédéric Weisbecker50.79%36.00%
Peter Zijlstra30.47%12.00%
Daniel Jacobowitz20.32%12.00%
Pavel Emelyanov10.16%12.00%
Total634100.00%50100.00%


static int *task_stopped_code(struct task_struct *p, bool ptrace) { if (ptrace) { if (task_is_traced(p) && !(p->jobctl & JOBCTL_LISTENING)) return &p->exit_code; } else { if (p->signal->flags & SIGNAL_STOP_STOPPED) return &p->signal->group_exit_code; } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov5582.09%250.00%
Tejun Heo913.43%125.00%
Ingo Molnar34.48%125.00%
Total67100.00%4100.00%

/** * wait_task_stopped - Wait for %TASK_STOPPED or %TASK_TRACED * @wo: wait options * @ptrace: is the wait for ptrace * @p: task to wait for * * Handle sys_wait4() work for %p in state %TASK_STOPPED or %TASK_TRACED. * * CONTEXT: * read_lock(&tasklist_lock), which is released if return value is * non-zero. Also, grabs and releases @p->sighand->siglock. * * RETURNS: * 0 if wait condition didn't exist and search for other wait conditions * should continue. Non-zero return, -errno on failure and @p's pid on * success, implies that tasklist_lock is released and wait condition * search should terminate. */
static int wait_task_stopped(struct wait_opts *wo, int ptrace, struct task_struct *p) { struct waitid_info *infop; int exit_code, *p_code, why; uid_t uid = 0; /* unneeded, required by compiler */ pid_t pid; /* * Traditionally we see ptrace'd stopped tasks regardless of options. */ if (!ptrace && !(wo->wo_flags & WUNTRACED)) return 0; if (!task_stopped_code(p, ptrace)) return 0; exit_code = 0; spin_lock_irq(&p->sighand->siglock); p_code = task_stopped_code(p, ptrace); if (unlikely(!p_code)) goto unlock_sig; exit_code = *p_code; if (!exit_code) goto unlock_sig; if (!unlikely(wo->wo_flags & WNOWAIT)) *p_code = 0; uid = from_kuid_munged(current_user_ns(), task_uid(p)); unlock_sig: spin_unlock_irq(&p->sighand->siglock); if (!exit_code) return 0; /* * Now we are pretty sure this task is interesting. * Make sure it doesn't get reaped out from under us while we * give up the lock and then examine it below. We don't want to * keep holding onto the tasklist_lock while we call getrusage and * possibly take page faults for user memory. */ get_task_struct(p); pid = task_pid_vnr(p); why = ptrace ? CLD_TRAPPED : CLD_STOPPED; read_unlock(&tasklist_lock); sched_annotate_sleep(); if (wo->wo_rusage) getrusage(p, RUSAGE_BOTH, wo->wo_rusage); put_task_struct(p); if (likely(!(wo->wo_flags & WNOWAIT))) wo->wo_stat = (exit_code << 8) | 0x7f; infop = wo->wo_info; if (infop) { infop->cause = why; infop->status = exit_code; infop->pid = pid; infop->uid = uid; } return pid; }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov13246.15%520.83%
Roland McGrath9332.52%312.50%
Al Viro196.64%312.50%
Tejun Heo134.55%14.17%
Linus Torvalds (pre-git)93.15%416.67%
Eric W. Biedermann62.10%14.17%
Pavel Emelyanov41.40%28.33%
Ingo Molnar41.40%28.33%
Peter Zijlstra31.05%14.17%
David Howells20.70%14.17%
Sasha Levin10.35%14.17%
Total286100.00%24100.00%

/* * Handle do_wait work for one task in a live, non-stopped state. * read_lock(&tasklist_lock) on entry. If we return zero, we still hold * the lock and this task is uninteresting. If we return nonzero, we have * released the lock and the system call should return. */
static int wait_task_continued(struct wait_opts *wo, struct task_struct *p) { struct waitid_info *infop; pid_t pid; uid_t uid; if (!unlikely(wo->wo_flags & WCONTINUED)) return 0; if (!(p->signal->flags & SIGNAL_STOP_CONTINUED)) return 0; spin_lock_irq(&p->sighand->siglock); /* Re-check with the lock held. */ if (!(p->signal->flags & SIGNAL_STOP_CONTINUED)) { spin_unlock_irq(&p->sighand->siglock); return 0; } if (!unlikely(wo->wo_flags & WNOWAIT)) p->signal->flags &= ~SIGNAL_STOP_CONTINUED; uid = from_kuid_munged(current_user_ns(), task_uid(p)); spin_unlock_irq(&p->sighand->siglock); pid = task_pid_vnr(p); get_task_struct(p); read_unlock(&tasklist_lock); sched_annotate_sleep(); if (wo->wo_rusage) getrusage(p, RUSAGE_BOTH, wo->wo_rusage); put_task_struct(p); infop = wo->wo_info; if (!infop) { wo->wo_stat = 0xffff; } else { infop->cause = CLD_CONTINUED; infop->pid = pid; infop->uid = uid; infop->status = SIGCONT; } return pid; }

Contributors

PersonTokensPropCommitsCommitProp
Roland McGrath16269.53%428.57%
Al Viro2912.45%214.29%
Oleg Nesterov208.58%17.14%
David Howells62.58%17.14%
Eric W. Biedermann62.58%17.14%
Pavel Emelyanov52.15%214.29%
Peter Zijlstra31.29%17.14%
Ingo Molnar10.43%17.14%
Sasha Levin10.43%17.14%
Total233100.00%14100.00%

/* * Consider @p for a wait by @parent. * * -ECHILD should be in ->notask_error before the first call. * Returns nonzero for a final return, when we have unlocked tasklist_lock. * Returns zero if the search for a child should continue; * then ->notask_error is 0 if @p is an eligible child, * or still -ECHILD. */
static int wait_consider_task(struct wait_opts *wo, int ptrace, struct task_struct *p) { /* * We can race with wait_task_zombie() from another thread. * Ensure that EXIT_ZOMBIE -> EXIT_DEAD/EXIT_TRACE transition * can't confuse the checks below. */ int exit_state = READ_ONCE(p->exit_state); int ret; if (unlikely(exit_state == EXIT_DEAD)) return 0; ret = eligible_child(wo, ptrace, p); if (!ret) return ret; if (unlikely(exit_state == EXIT_TRACE)) { /* * ptrace == 0 means we are the natural parent. In this case * we should clear notask_error, debugger will notify us. */ if (likely(!ptrace)) wo->notask_error = 0; return 0; } if (likely(!ptrace) && unlikely(p->ptrace)) { /* * If it is traced by its real parent's group, just pretend * the caller is ptrace_do_wait() and reap this child if it * is zombie. * * This also hides group stop state from real parent; otherwise * a single stop can be reported twice as group and ptrace stop. * If a ptracer wants to distinguish these two events for its * own children it should create a separate process which takes * the role of real parent. */ if (!ptrace_reparented(p)) ptrace = 1; } /* slay zombie? */ if (exit_state == EXIT_ZOMBIE) { /* we don't reap group leaders with subthreads */ if (!delay_group_leader(p)) { /* * A zombie ptracee is only visible to its ptracer. * Notification and reaping will be cascaded to the * real parent when the ptracer detaches. */ if (unlikely(ptrace) || likely(!p->ptrace)) return wait_task_zombie(wo, p); } /* * Allow access to stopped/continued state via zombie by * falling through. Clearing of notask_error is complex. * * When !@ptrace: * * If WEXITED is set, notask_error should naturally be * cleared. If not, subset of WSTOPPED|WCONTINUED is set, * so, if there are live subthreads, there are events to * wait for. If all subthreads are dead, it's still safe * to clear - this function will be called again in finite * amount time once all the subthreads are released and * will then return without clearing. * * When @ptrace: * * Stopped state is per-task and thus can't change once the * target task dies. Only continued and exited can happen. * Clear notask_error if WCONTINUED | WEXITED. */ if (likely(!ptrace) || (wo->wo_flags & (WCONTINUED | WEXITED))) wo->notask_error = 0; } else { /* * @p is alive and it's gonna stop, continue or exit, so * there always is something to wait for. */ wo->notask_error = 0; } /* * Wait for stopped. Depending on @ptrace, different stopped state * is used and the two don't interact with each other. */ ret = wait_task_stopped(wo, ptrace, p); if (ret) return ret; /* * Wait for continued. There's only one continued state and the * ptracer can consume it which can confuse the real parent. Don't * use WCONTINUED from ptracer. You don't need or want it. */ return wait_task_continued(wo, p); }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov11449.14%1045.45%
Roland McGrath7130.60%627.27%
Tejun Heo4519.40%418.18%
Ingo Molnar10.43%14.55%
Mark Rutland10.43%14.55%
Total232100.00%22100.00%

/* * Do the work of do_wait() for one thread in the group, @tsk. * * -ECHILD should be in ->notask_error before the first call. * Returns nonzero for a final return, when we have unlocked tasklist_lock. * Returns zero if the search for a child should continue; then * ->notask_error is 0 if there were any eligible children, * or still -ECHILD. */
static int do_wait_thread(struct wait_opts *wo, struct task_struct *tsk) { struct task_struct *p; list_for_each_entry(p, &tsk->children, sibling) { int ret = wait_consider_task(wo, 0, p); if (ret) return ret; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Roland McGrath4686.79%466.67%
Oleg Nesterov611.32%116.67%
Matthew Wilcox11.89%116.67%
Total53100.00%6100.00%


static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk) { struct task_struct *p; list_for_each_entry(p, &tsk->ptraced, ptrace_entry) { int ret = wait_consider_task(wo, 1, p); if (ret) return ret; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Roland McGrath4483.02%466.67%
Oleg Nesterov611.32%116.67%
Matthias Kaehlcke35.66%116.67%
Total53100.00%6100.00%


static int child_wait_callback(wait_queue_entry_t *wait, unsigned mode, int sync, void *key) { struct wait_opts *wo = container_of(wait, struct wait_opts, child_wait); struct task_struct *p = key; if (!eligible_pid(wo, p)) return 0; if ((wo->wo_flags & __WNOTHREAD) && wait->private != p->parent) return 0; return default_wake_function(wait, mode, sync, key); }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov8798.86%375.00%
Ingo Molnar11.14%125.00%
Total88100.00%4100.00%


void __wake_up_parent(struct task_struct *p, struct task_struct *parent) { __wake_up_sync_key(&parent->signal->wait_chldexit, TASK_INTERRUPTIBLE, 1, p); }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov31100.00%2100.00%
Total31100.00%2100.00%


static long do_wait(struct wait_opts *wo) { struct task_struct *tsk; int retval; trace_sched_process_wait(wo->wo_pid); init_waitqueue_func_entry(&wo->child_wait, child_wait_callback); wo->child_wait.private = current; add_wait_queue(&current->signal->wait_chldexit, &wo->child_wait); repeat: /* * If there is nothing that can match our criteria, just get out. * We will clear ->notask_error to zero if we see any child that * might later match our criteria, even if we are not able to reap * it yet. */ wo->notask_error = -ECHILD; if ((wo->wo_type < PIDTYPE_MAX) && (!wo->wo_pid || hlist_empty(&wo->wo_pid->tasks[wo->wo_type]))) goto notask; set_current_state(TASK_INTERRUPTIBLE); read_lock(&tasklist_lock); tsk = current; do { retval = do_wait_thread(wo, tsk); if (retval) goto end; retval = ptrace_do_wait(wo, tsk); if (retval) goto end; if (wo->wo_flags & __WNOTHREAD) break; } while_each_thread(current, tsk);

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov7142.51%646.15%
Roland McGrath6639.52%430.77%
Eric W. Biedermann2514.97%17.69%
Mathieu Desnoyers42.40%17.69%
Frans Klaver10.60%17.69%
Total167100.00%13100.00%

read_unlock(&tasklist_lock); notask: retval = wo->notask_error; if (!retval && !(wo->wo_flags & WNOHANG)) { retval = -ERESTARTSYS; if (!signal_pending(current)) { schedule(); goto repeat; } } end: __set_current_state(TASK_RUNNING); remove_wait_queue(&current->signal->wait_chldexit, &wo->child_wait); return retval;
} static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop, int options, struct rusage *ru) { struct wait_opts wo; struct pid *pid = NULL; enum pid_type type; long ret; if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED| __WNOTHREAD|__WCLONE|__WALL)) return -EINVAL; if (!(options & (WEXITED|WSTOPPED|WCONTINUED))) return -EINVAL; switch (which) { case P_ALL: type = PIDTYPE_MAX; break; case P_PID: type = PIDTYPE_PID; if (upid <= 0) return -EINVAL; break; case P_PGID: type = PIDTYPE_PGID; if (upid <= 0) return -EINVAL; break; default: return -EINVAL; } if (type < PIDTYPE_MAX) pid = find_get_pid(upid); wo.wo_type = type; wo.wo_pid = pid; wo.wo_flags = options; wo.wo_info = infop; wo.wo_rusage = ru; ret = do_wait(&wo); put_pid(pid); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Roland McGrath8843.35%220.00%
Oleg Nesterov4723.15%330.00%
Al Viro3215.76%220.00%
Eric W. Biedermann3115.27%110.00%
Ingo Molnar41.97%110.00%
Vitaly Mayatskikh10.49%110.00%
Total203100.00%10100.00%

SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *, infop, int, options, struct rusage __user *, ru) { struct rusage r; struct waitid_info info = {.status = 0}; long err = kernel_waitid(which, upid, &info, options, ru ? &r : NULL); int signo = 0; if (err > 0) { signo = SIGCHLD; err = 0; if (ru && copy_to_user(ru, &r, sizeof(struct rusage))) return -EFAULT; } if (!infop) return err; if (!access_ok(VERIFY_WRITE, infop, sizeof(*infop))) return -EFAULT; user_access_begin(); unsafe_put_user(signo, &infop->si_signo, Efault); unsafe_put_user(0, &infop->si_errno, Efault); unsafe_put_user(info.cause, &infop->si_code, Efault); unsafe_put_user(info.pid, &infop->si_pid, Efault); unsafe_put_user(info.uid, &infop->si_uid, Efault); unsafe_put_user(info.status, &infop->si_status, Efault); user_access_end(); return err; Efault: user_access_end(); return -EFAULT; }
long kernel_wait4(pid_t upid, int __user *stat_addr, int options, struct rusage *ru) { struct wait_opts wo; struct pid *pid = NULL; enum pid_type type; long ret; if (options & ~(WNOHANG|WUNTRACED|WCONTINUED| __WNOTHREAD|__WCLONE|__WALL)) return -EINVAL; /* -INT_MIN is not defined */ if (upid == INT_MIN) return -ESRCH; if (upid == -1) type = PIDTYPE_MAX; else if (upid < 0) { type = PIDTYPE_PGID; pid = find_get_pid(-upid); } else if (upid == 0) { type = PIDTYPE_PGID; pid = get_task_pid(current, PIDTYPE_PGID); } else /* upid > 0 */ { type = PIDTYPE_PID; pid = find_get_pid(upid); } wo.wo_type = type; wo.wo_pid = pid; wo.wo_flags = options | WEXITED; wo.wo_info = NULL; wo.wo_stat = 0; wo.wo_rusage = ru; ret = do_wait(&wo); put_pid(pid); if (ret > 0 && stat_addr && put_user(wo.wo_stat, stat_addr)) ret = -EFAULT; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann7735.32%110.00%
Oleg Nesterov4922.48%330.00%
Al Viro4420.18%220.00%
Roland McGrath3114.22%220.00%
zhong jiang115.05%110.00%
Ingo Molnar62.75%110.00%
Total218100.00%10100.00%

SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr, int, options, struct rusage __user *, ru) { struct rusage r; long err = kernel_wait4(upid, stat_addr, options, ru ? &r : NULL); if (err > 0) { if (ru && copy_to_user(ru, &r, sizeof(struct rusage))) return -EFAULT; } return err; } #ifdef __ARCH_WANT_SYS_WAITPID /* * sys_waitpid() remains for compatibility. waitpid() should be * implemented by calling sys_wait4() from libc.a. */ SYSCALL_DEFINE3(waitpid, pid_t, pid, int __user *, stat_addr, int, options) { return sys_wait4(pid, stat_addr, options, NULL); } #endif #ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE4(wait4, compat_pid_t, pid, compat_uint_t __user *, stat_addr, int, options, struct compat_rusage __user *, ru) { struct rusage r; long err = kernel_wait4(pid, stat_addr, options, ru ? &r : NULL); if (err > 0) { if (ru && put_compat_rusage(&r, ru)) return -EFAULT; } return err; } COMPAT_SYSCALL_DEFINE5(waitid, int, which, compat_pid_t, pid, struct compat_siginfo __user *, infop, int, options, struct compat_rusage __user *, uru) { struct rusage ru; struct waitid_info info = {.status = 0}; long err = kernel_waitid(which, pid, &info, options, uru ? &ru : NULL); int signo = 0; if (err > 0) { signo = SIGCHLD; err = 0; if (uru) { /* kernel_waitid() overwrites everything in ru */ if (COMPAT_USE_64BIT_TIME) err = copy_to_user(uru, &ru, sizeof(ru)); else err = put_compat_rusage(&ru, uru); if (err) return -EFAULT; } } if (!infop) return err; if (!access_ok(VERIFY_WRITE, infop, sizeof(*infop))) return -EFAULT; user_access_begin(); unsafe_put_user(signo, &infop->si_signo, Efault); unsafe_put_user(0, &infop->si_errno, Efault); unsafe_put_user(info.cause, &infop->si_code, Efault); unsafe_put_user(info.pid, &infop->si_pid, Efault); unsafe_put_user(info.uid, &infop->si_uid, Efault); unsafe_put_user(info.status, &infop->si_status, Efault); user_access_end(); return err; Efault: user_access_end(); return -EFAULT; } #endif
__weak void abort(void) { BUG(); /* if that doesn't kill us, halt */ panic("Oops failed to kill thread"); }

Contributors

PersonTokensPropCommitsCommitProp
Sudip Mukherjee17100.00%1100.00%
Total17100.00%1100.00%

EXPORT_SYMBOL(abort);

Overall Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov209532.01%10125.06%
Roland McGrath94514.44%225.46%
Al Viro81612.47%194.71%
Ingo Molnar3475.30%338.19%
Linus Torvalds (pre-git)3124.77%4210.42%
Eric W. Biedermann2463.76%81.99%
Balbir Singh1792.74%20.50%
Linus Torvalds861.31%112.73%
Andrew Morton861.31%122.98%
Jeff Dike851.30%10.25%
Daniel Jacobowitz791.21%51.24%
Tejun Heo761.16%71.74%
Eric Dumazet711.08%20.50%
Vitaly Mayatskikh661.01%10.25%
Davidlohr Bueso A590.90%30.74%
Nico Pitre560.86%20.50%
Jiri Pirko510.78%10.25%
Lennart Poettering480.73%10.25%
David Howells410.63%61.49%
Kees Cook400.61%20.50%
Andrea Righi390.60%20.50%
Peter Zijlstra380.58%61.49%
Rik Van Riel380.58%30.74%
Kamezawa Hiroyuki340.52%30.74%
Frédéric Weisbecker320.49%40.99%
Paul E. McKenney290.44%71.74%
Jesper Juhl270.41%20.50%
Jens Axboe260.40%40.99%
Alexander Nyberg260.40%10.25%
Mathieu Desnoyers250.38%10.25%
Robert Love240.37%40.99%
Alexey Kuznetsov210.32%10.25%
Fengguang Wu200.31%10.25%
Heiko Carstens200.31%20.50%
Pavel Emelyanov190.29%40.99%
Hidetoshi Seto180.28%20.50%
Sudip Mukherjee170.26%10.25%
Kirill Korotaev160.24%10.25%
Laurent Vivier160.24%10.25%
KaiGai Kohei140.21%20.50%
Denys Vlasenko140.21%10.25%
Shailabh Nagar120.18%30.74%
zhong jiang110.17%10.25%
Dave Jones100.15%20.50%
Martin Schwidefsky100.15%10.25%
Dmitriy Vyukov80.12%10.25%
John Levon80.12%20.50%
Namhyung Kim80.12%10.25%
Paul Menage80.12%10.25%
Cédric Le Goater80.12%20.50%
Michal Hocko70.11%10.25%
Hugh Dickins70.11%10.25%
Stéphane Eranian60.09%10.25%
Nelson Elhage60.09%10.25%
Arnaldo Carvalho de Melo50.08%10.25%
Serge E. Hallyn50.08%30.74%
Byungchul Park50.08%10.25%
Tim Bird50.08%10.25%
Guillaume Morin50.08%10.25%
Vasiliy Kulikov50.08%10.25%
Miloslav Trmač50.08%10.25%
Alexey Dobriyan50.08%10.25%
Russ Anderson50.08%10.25%
Sukadev Bhattiprolu50.08%20.50%
Konstantin Khlebnikov50.08%10.25%
Matthias Kaehlcke50.08%10.25%
Ionut Alexa40.06%10.25%
Miao Xie40.06%10.25%
Andrea Arcangeli40.06%10.25%
Mandeep Singh Baines40.06%10.25%
Adrian Bunk40.06%20.50%
Christoph Hellwig30.05%10.25%
Randy Dunlap30.05%10.25%
Louis Rilling30.05%10.25%
Arnd Bergmann30.05%10.25%
Matt Helsley30.05%10.25%
Ying Han30.05%10.25%
Jay Lan30.05%10.25%
Coywolf Qi Hunt30.05%10.25%
Richard Kennedy30.05%10.25%
Eric Sesterhenn / Snakebyte30.05%10.25%
Steve VanDeBogart30.05%10.25%
Jiri Slaby30.05%10.25%
Sasha Levin20.03%10.25%
Stephen D. Smalley20.03%10.25%
David Rientjes20.03%20.50%
Alan Cox20.03%10.25%
Paul Mackerras20.03%10.25%
Eric Sandeen10.02%10.25%
Frans Klaver10.02%10.25%
Vegard Nossum10.02%10.25%
Tetsuo Handa10.02%10.25%
Colin Cross10.02%10.25%
Anton Blanchard10.02%10.25%
Matthew Wilcox10.02%10.25%
Steven Rostedt10.02%10.25%
Johannes Weiner10.02%10.25%
Christoph Lameter10.02%10.25%
Thomas Gleixner10.02%10.25%
Mark Rutland10.02%10.25%
Total6544100.00%403100.00%
Directory: kernel
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