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kernel/exit.c
46.4 KB
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/* * linux/kernel/exit.c * * Copyright (C) 1991, 1992 Linus Torvalds */ |
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#include <linux/mm.h> #include <linux/slab.h> #include <linux/interrupt.h> |
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#include <linux/module.h> |
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#include <linux/capability.h> |
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#include <linux/completion.h> #include <linux/personality.h> #include <linux/tty.h> |
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#include <linux/iocontext.h> |
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#include <linux/key.h> #include <linux/security.h> #include <linux/cpu.h> #include <linux/acct.h> |
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#include <linux/tsacct_kern.h> |
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#include <linux/file.h> |
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#include <linux/fdtable.h> |
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#include <linux/binfmts.h> |
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#include <linux/nsproxy.h> |
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#include <linux/pid_namespace.h> |
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#include <linux/ptrace.h> #include <linux/profile.h> #include <linux/mount.h> #include <linux/proc_fs.h> |
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#include <linux/kthread.h> |
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#include <linux/mempolicy.h> |
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#include <linux/taskstats_kern.h> |
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#include <linux/delayacct.h> |
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#include <linux/freezer.h> |
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#include <linux/cgroup.h> |
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#include <linux/syscalls.h> |
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#include <linux/signal.h> |
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#include <linux/posix-timers.h> |
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#include <linux/cn_proc.h> |
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#include <linux/mutex.h> |
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#include <linux/futex.h> |
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#include <linux/pipe_fs_i.h> |
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#include <linux/audit.h> /* for audit_free() */ |
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#include <linux/resource.h> |
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#include <linux/blkdev.h> |
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#include <linux/task_io_accounting_ops.h> |
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#include <linux/tracehook.h> |
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#include <linux/fs_struct.h> |
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#include <linux/init_task.h> |
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#include <linux/perf_event.h> |
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#include <trace/events/sched.h> |
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#include <linux/hw_breakpoint.h> |
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#include <linux/oom.h> |
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#include <linux/writeback.h> |
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#include <asm/uaccess.h> #include <asm/unistd.h> #include <asm/pgtable.h> #include <asm/mmu_context.h> |
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static void exit_mm(struct task_struct * tsk); |
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static void __unhash_process(struct task_struct *p, bool group_dead) |
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{ nr_threads--; detach_pid(p, PIDTYPE_PID); |
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if (group_dead) { |
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detach_pid(p, PIDTYPE_PGID); detach_pid(p, PIDTYPE_SID); |
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|
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list_del_rcu(&p->tasks); |
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list_del_init(&p->sibling); |
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__this_cpu_dec(process_counts); |
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} |
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list_del_rcu(&p->thread_group); |
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} |
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/* * This function expects the tasklist_lock write-locked. */ static void __exit_signal(struct task_struct *tsk) { struct signal_struct *sig = tsk->signal; |
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bool group_dead = thread_group_leader(tsk); |
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struct sighand_struct *sighand; |
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struct tty_struct *uninitialized_var(tty); |
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|
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sighand = rcu_dereference_check(tsk->sighand, |
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lockdep_tasklist_lock_is_held()); |
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spin_lock(&sighand->siglock); posix_cpu_timers_exit(tsk); |
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if (group_dead) { |
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posix_cpu_timers_exit_group(tsk); |
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tty = sig->tty; sig->tty = NULL; |
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} else { |
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/* |
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* 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); /* |
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* If there is any task waiting for the group exit * then notify it: */ |
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if (sig->notify_count > 0 && !--sig->notify_count) |
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wake_up_process(sig->group_exit_task); |
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|
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if (tsk == sig->curr_target) sig->curr_target = next_thread(tsk); /* * Accumulate here the counters for all threads but the * group leader as they die, so they can be added into * the process-wide totals when those are taken. * The group leader stays around as a zombie as long * as there are other threads. When it gets reaped, * the exit.c code will add its counts into these totals. * We won't ever get here for the group leader, since it * will have been the last reference on the signal_struct. */ |
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sig->utime += tsk->utime; sig->stime += tsk->stime; sig->gtime += tsk->gtime; |
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sig->min_flt += tsk->min_flt; sig->maj_flt += tsk->maj_flt; sig->nvcsw += tsk->nvcsw; sig->nivcsw += tsk->nivcsw; |
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sig->inblock += task_io_get_inblock(tsk); sig->oublock += task_io_get_oublock(tsk); |
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task_io_accounting_add(&sig->ioac, &tsk->ioac); |
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sig->sum_sched_runtime += tsk->se.sum_exec_runtime; |
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} |
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sig->nr_threads--; |
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__unhash_process(tsk, group_dead); |
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|
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/* * Do this under ->siglock, we can race with another thread * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals. */ flush_sigqueue(&tsk->pending); |
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tsk->sighand = NULL; |
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spin_unlock(&sighand->siglock); |
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|
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__cleanup_sighand(sighand); |
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clear_tsk_thread_flag(tsk,TIF_SIGPENDING); |
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if (group_dead) { |
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flush_sigqueue(&sig->shared_pending); |
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tty_kref_put(tty); |
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} } |
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static void delayed_put_task_struct(struct rcu_head *rhp) { |
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struct task_struct *tsk = container_of(rhp, struct task_struct, rcu); |
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perf_event_delayed_put(tsk); |
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trace_sched_process_free(tsk); put_task_struct(tsk); |
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} |
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|
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void release_task(struct task_struct * p) { |
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struct task_struct *leader; |
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int zap_leader; |
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repeat: |
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/* don't need to get the RCU readlock here - the process is dead and |
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* can't be modifying its own credentials. But shut RCU-lockdep up */ rcu_read_lock(); |
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atomic_dec(&__task_cred(p)->user->processes); |
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rcu_read_unlock(); |
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|
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proc_flush_task(p); |
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|
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write_lock_irq(&tasklist_lock); |
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ptrace_release_task(p); |
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__exit_signal(p); |
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|
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/* * 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) { |
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/* * 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. |
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*/ |
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zap_leader = do_notify_parent(leader, leader->exit_signal); |
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if (zap_leader) leader->exit_state = EXIT_DEAD; |
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} |
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write_unlock_irq(&tasklist_lock); |
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release_thread(p); |
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call_rcu(&p->rcu, delayed_put_task_struct); |
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p = leader; if (unlikely(zap_leader)) goto repeat; } |
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/* * This checks not only the pgrp, but falls back on the pid if no * satisfactory pgrp is found. I dunno - gdb doesn't work correctly * without this... |
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* * The caller must hold rcu lock or the tasklist lock. |
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*/ |
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struct pid *session_of_pgrp(struct pid *pgrp) |
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{ struct task_struct *p; |
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struct pid *sid = NULL; |
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|
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p = pid_task(pgrp, PIDTYPE_PGID); |
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if (p == NULL) |
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p = pid_task(pgrp, PIDTYPE_PID); |
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if (p != NULL) |
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sid = task_session(p); |
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|
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return sid; } /* * 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?" */ |
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static int will_become_orphaned_pgrp(struct pid *pgrp, struct task_struct *ignored_task) |
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{ struct task_struct *p; |
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|
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do_each_pid_task(pgrp, PIDTYPE_PGID, p) { |
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if ((p == ignored_task) || (p->exit_state && thread_group_empty(p)) || is_global_init(p->real_parent)) |
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continue; |
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|
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if (task_pgrp(p->real_parent) != pgrp && |
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task_session(p->real_parent) == task_session(p)) return 0; |
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} while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
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return 1; |
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} |
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int is_current_pgrp_orphaned(void) |
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{ int retval; read_lock(&tasklist_lock); |
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retval = will_become_orphaned_pgrp(task_pgrp(current), NULL); |
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read_unlock(&tasklist_lock); return retval; } |
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static bool has_stopped_jobs(struct pid *pgrp) |
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{ |
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struct task_struct *p; |
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do_each_pid_task(pgrp, PIDTYPE_PGID, p) { |
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if (p->signal->flags & SIGNAL_STOP_STOPPED) return true; |
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} while_each_pid_task(pgrp, PIDTYPE_PGID, p); |
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return false; |
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} |
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/* * 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); } } |
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/** |
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* reparent_to_kthreadd - Reparent the calling kernel thread to kthreadd |
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* * If a kernel thread is launched as a result of a system call, or if |
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* it ever exits, it should generally reparent itself to kthreadd so it * isn't in the way of other processes and is correctly cleaned up on exit. |
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* * The various task state such as scheduling policy and priority may have * been inherited from a user process, so we reset them to sane values here. * |
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* NOTE that reparent_to_kthreadd() gives the caller full capabilities. |
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*/ |
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static void reparent_to_kthreadd(void) |
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{ write_lock_irq(&tasklist_lock); ptrace_unlink(current); /* Reparent to init */ |
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current->real_parent = current->parent = kthreadd_task; |
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list_move_tail(¤t->sibling, ¤t->real_parent->children); |
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/* Set the exit signal to SIGCHLD so we signal init on exit */ current->exit_signal = SIGCHLD; |
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if (task_nice(current) < 0) |
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set_user_nice(current, 0); /* cpus_allowed? */ /* rt_priority? */ /* signals? */ |
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memcpy(current->signal->rlim, init_task.signal->rlim, sizeof(current->signal->rlim)); |
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atomic_inc(&init_cred.usage); commit_creds(&init_cred); |
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write_unlock_irq(&tasklist_lock); |
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} |
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void __set_special_pids(struct pid *pid) |
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{ |
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struct task_struct *curr = current->group_leader; |
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|
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if (task_session(curr) != pid) |
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change_pid(curr, PIDTYPE_SID, pid); |
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if (task_pgrp(curr) != pid) |
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change_pid(curr, PIDTYPE_PGID, pid); |
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} |
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static void set_special_pids(struct pid *pid) |
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{ write_lock_irq(&tasklist_lock); |
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__set_special_pids(pid); |
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write_unlock_irq(&tasklist_lock); } /* |
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* Let kernel threads use this to say that they allow a certain signal. * Must not be used if kthread was cloned with CLONE_SIGHAND. |
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*/ int allow_signal(int sig) { |
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if (!valid_signal(sig) || sig < 1) |
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return -EINVAL; spin_lock_irq(¤t->sighand->siglock); |
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/* This is only needed for daemonize()'ed kthreads */ |
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sigdelset(¤t->blocked, sig); |
87245135d allow_signal: kil... |
361 362 363 364 365 366 |
/* * Kernel threads handle their own signals. Let the signal code * know it'll be handled, so that they don't get converted to * SIGKILL or just silently dropped. */ current->sighand->action[(sig)-1].sa.sa_handler = (void __user *)2; |
1da177e4c Linux-2.6.12-rc2 |
367 368 369 370 371 372 373 374 375 |
recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); return 0; } EXPORT_SYMBOL(allow_signal); int disallow_signal(int sig) { |
7ed20e1ad [PATCH] convert t... |
376 |
if (!valid_signal(sig) || sig < 1) |
1da177e4c Linux-2.6.12-rc2 |
377 378 379 |
return -EINVAL; spin_lock_irq(¤t->sighand->siglock); |
10ab825bd change kernel thr... |
380 |
current->sighand->action[(sig)-1].sa.sa_handler = SIG_IGN; |
1da177e4c Linux-2.6.12-rc2 |
381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 |
recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); return 0; } EXPORT_SYMBOL(disallow_signal); /* * Put all the gunge required to become a kernel thread without * attached user resources in one place where it belongs. */ void daemonize(const char *name, ...) { va_list args; |
1da177e4c Linux-2.6.12-rc2 |
396 397 398 399 400 401 402 403 404 405 406 407 |
sigset_t blocked; va_start(args, name); vsnprintf(current->comm, sizeof(current->comm), name, args); va_end(args); /* * If we were started as result of loading a module, close all of the * user space pages. We don't need them, and if we didn't close them * they would be locked into memory. */ exit_mm(current); |
831441862 Freezer: make ker... |
408 409 410 411 |
/* * We don't want to have TIF_FREEZE set if the system-wide hibernation * or suspend transition begins right now. */ |
7b34e4283 introduce PF_KTHR... |
412 |
current->flags |= (PF_NOFREEZE | PF_KTHREAD); |
1da177e4c Linux-2.6.12-rc2 |
413 |
|
8520d7c7f teach set_special... |
414 415 416 417 |
if (current->nsproxy != &init_nsproxy) { get_nsproxy(&init_nsproxy); switch_task_namespaces(current, &init_nsproxy); } |
297bd42b1 move daemonized k... |
418 |
set_special_pids(&init_struct_pid); |
24ec839c4 [PATCH] tty: ->si... |
419 |
proc_clear_tty(current); |
1da177e4c Linux-2.6.12-rc2 |
420 421 422 423 424 425 426 |
/* Block and flush all signals */ sigfillset(&blocked); sigprocmask(SIG_BLOCK, &blocked, NULL); flush_signals(current); /* Become as one with the init task */ |
3e93cd671 Take fs_struct ha... |
427 |
daemonize_fs_struct(); |
d4c5e41f3 whitespace fixes:... |
428 |
exit_files(current); |
1da177e4c Linux-2.6.12-rc2 |
429 430 |
current->files = init_task.files; atomic_inc(¤t->files->count); |
49d769d52 Change reparent_t... |
431 |
reparent_to_kthreadd(); |
1da177e4c Linux-2.6.12-rc2 |
432 433 434 |
} EXPORT_SYMBOL(daemonize); |
858119e15 [PATCH] Unlinline... |
435 |
static void close_files(struct files_struct * files) |
1da177e4c Linux-2.6.12-rc2 |
436 437 |
{ int i, j; |
badf16621 [PATCH] files: br... |
438 |
struct fdtable *fdt; |
1da177e4c Linux-2.6.12-rc2 |
439 440 |
j = 0; |
4fb3a5386 [PATCH] files: fi... |
441 442 443 444 |
/* * It is safe to dereference the fd table without RCU or * ->file_lock because this is the last reference to the |
d11c563dd sched: Use lockde... |
445 |
* files structure. But use RCU to shut RCU-lockdep up. |
4fb3a5386 [PATCH] files: fi... |
446 |
*/ |
d11c563dd sched: Use lockde... |
447 |
rcu_read_lock(); |
badf16621 [PATCH] files: br... |
448 |
fdt = files_fdtable(files); |
d11c563dd sched: Use lockde... |
449 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
450 451 452 |
for (;;) { unsigned long set; i = j * __NFDBITS; |
bbea9f696 [PATCH] fdtable: ... |
453 |
if (i >= fdt->max_fds) |
1da177e4c Linux-2.6.12-rc2 |
454 |
break; |
badf16621 [PATCH] files: br... |
455 |
set = fdt->open_fds->fds_bits[j++]; |
1da177e4c Linux-2.6.12-rc2 |
456 457 |
while (set) { if (set & 1) { |
badf16621 [PATCH] files: br... |
458 |
struct file * file = xchg(&fdt->fd[i], NULL); |
944be0b22 [PATCH] close_fil... |
459 |
if (file) { |
1da177e4c Linux-2.6.12-rc2 |
460 |
filp_close(file, files); |
944be0b22 [PATCH] close_fil... |
461 462 |
cond_resched(); } |
1da177e4c Linux-2.6.12-rc2 |
463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 |
} i++; set >>= 1; } } } struct files_struct *get_files_struct(struct task_struct *task) { struct files_struct *files; task_lock(task); files = task->files; if (files) atomic_inc(&files->count); task_unlock(task); return files; } |
7ad5b3a50 kernel: remove fa... |
482 |
void put_files_struct(struct files_struct *files) |
1da177e4c Linux-2.6.12-rc2 |
483 |
{ |
badf16621 [PATCH] files: br... |
484 |
struct fdtable *fdt; |
1da177e4c Linux-2.6.12-rc2 |
485 486 487 488 |
if (atomic_dec_and_test(&files->count)) { close_files(files); /* * Free the fd and fdset arrays if we expanded them. |
ab2af1f50 [PATCH] files: fi... |
489 490 491 |
* If the fdtable was embedded, pass files for freeing * at the end of the RCU grace period. Otherwise, * you can free files immediately. |
1da177e4c Linux-2.6.12-rc2 |
492 |
*/ |
d11c563dd sched: Use lockde... |
493 |
rcu_read_lock(); |
badf16621 [PATCH] files: br... |
494 |
fdt = files_fdtable(files); |
4fd45812c [PATCH] fdtable: ... |
495 |
if (fdt != &files->fdtab) |
ab2af1f50 [PATCH] files: fi... |
496 |
kmem_cache_free(files_cachep, files); |
01b2d93ca [PATCH] fdtable: ... |
497 |
free_fdtable(fdt); |
d11c563dd sched: Use lockde... |
498 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
499 500 |
} } |
3b1253880 [PATCH] sanitize ... |
501 |
void reset_files_struct(struct files_struct *files) |
3b9b8ab65 [PATCH] Fix unser... |
502 |
{ |
3b1253880 [PATCH] sanitize ... |
503 |
struct task_struct *tsk = current; |
3b9b8ab65 [PATCH] Fix unser... |
504 505 506 507 508 509 510 511 |
struct files_struct *old; old = tsk->files; task_lock(tsk); tsk->files = files; task_unlock(tsk); put_files_struct(old); } |
3b9b8ab65 [PATCH] Fix unser... |
512 |
|
1ec7f1ddb [PATCH] get rid o... |
513 |
void exit_files(struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
514 515 516 517 518 519 520 521 522 523 |
{ struct files_struct * files = tsk->files; if (files) { task_lock(tsk); tsk->files = NULL; task_unlock(tsk); put_files_struct(files); } } |
cf475ad28 cgroups: add an o... |
524 525 |
#ifdef CONFIG_MM_OWNER /* |
733eda7ac memcg: clear mm->... |
526 |
* A task is exiting. If it owned this mm, find a new owner for the mm. |
cf475ad28 cgroups: add an o... |
527 |
*/ |
cf475ad28 cgroups: add an o... |
528 529 530 531 532 |
void mm_update_next_owner(struct mm_struct *mm) { struct task_struct *c, *g, *p = current; retry: |
733eda7ac memcg: clear mm->... |
533 534 535 536 537 |
/* * If the exiting or execing task is not the owner, it's * someone else's problem. */ if (mm->owner != p) |
cf475ad28 cgroups: add an o... |
538 |
return; |
733eda7ac memcg: clear mm->... |
539 540 541 542 543 544 545 546 547 |
/* * 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; } |
cf475ad28 cgroups: add an o... |
548 549 550 551 552 553 554 555 556 557 558 559 560 |
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 */ |
dea33cfd9 ptrace: mm_need_n... |
561 |
list_for_each_entry(c, &p->real_parent->children, sibling) { |
cf475ad28 cgroups: add an o... |
562 563 564 565 566 567 568 569 570 571 572 573 574 575 |
if (c->mm == mm) goto assign_new_owner; } /* * Search through everything else. We should not get * here often */ do_each_thread(g, c) { if (c->mm == mm) goto assign_new_owner; } while_each_thread(g, c); read_unlock(&tasklist_lock); |
31a78f23b mm owner: fix rac... |
576 577 578 |
/* * We found no owner yet mm_users > 1: this implies that we are * most likely racing with swapoff (try_to_unuse()) or /proc or |
e5991371e mm: remove cgroup... |
579 |
* ptrace or page migration (get_task_mm()). Mark owner as NULL. |
31a78f23b mm owner: fix rac... |
580 |
*/ |
31a78f23b mm owner: fix rac... |
581 |
mm->owner = NULL; |
cf475ad28 cgroups: add an o... |
582 583 584 585 586 587 588 589 590 591 |
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); |
e5991371e mm: remove cgroup... |
592 593 594 595 596 |
/* * Delay read_unlock() till we have the task_lock() * to ensure that c does not slip away underneath us */ read_unlock(&tasklist_lock); |
cf475ad28 cgroups: add an o... |
597 598 599 600 601 |
if (c->mm != mm) { task_unlock(c); put_task_struct(c); goto retry; } |
cf475ad28 cgroups: add an o... |
602 603 604 605 606 |
mm->owner = c; task_unlock(c); put_task_struct(c); } #endif /* CONFIG_MM_OWNER */ |
1da177e4c Linux-2.6.12-rc2 |
607 608 609 610 |
/* * Turn us into a lazy TLB process if we * aren't already.. */ |
408b664a7 [PATCH] make lots... |
611 |
static void exit_mm(struct task_struct * tsk) |
1da177e4c Linux-2.6.12-rc2 |
612 613 |
{ struct mm_struct *mm = tsk->mm; |
b564daf80 coredump: constru... |
614 |
struct core_state *core_state; |
1da177e4c Linux-2.6.12-rc2 |
615 616 617 618 619 620 |
mm_release(tsk, mm); if (!mm) return; /* * Serialize with any possible pending coredump. |
999d9fc16 coredump: move mm... |
621 |
* We must hold mmap_sem around checking core_state |
1da177e4c Linux-2.6.12-rc2 |
622 |
* and clearing tsk->mm. The core-inducing thread |
999d9fc16 coredump: move mm... |
623 |
* will increment ->nr_threads for each thread in the |
1da177e4c Linux-2.6.12-rc2 |
624 625 626 |
* group with ->mm != NULL. */ down_read(&mm->mmap_sem); |
b564daf80 coredump: constru... |
627 628 629 |
core_state = mm->core_state; if (core_state) { struct core_thread self; |
1da177e4c Linux-2.6.12-rc2 |
630 |
up_read(&mm->mmap_sem); |
1da177e4c Linux-2.6.12-rc2 |
631 |
|
b564daf80 coredump: constru... |
632 633 634 635 636 637 638 639 |
self.task = tsk; 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); |
1da177e4c Linux-2.6.12-rc2 |
640 |
|
a94e2d408 coredump: kill mm... |
641 642 643 644 645 646 647 |
for (;;) { set_task_state(tsk, TASK_UNINTERRUPTIBLE); if (!self.task) /* see coredump_finish() */ break; schedule(); } __set_task_state(tsk, TASK_RUNNING); |
1da177e4c Linux-2.6.12-rc2 |
648 649 650 |
down_read(&mm->mmap_sem); } atomic_inc(&mm->mm_count); |
125e18745 [PATCH] More BUG_... |
651 |
BUG_ON(mm != tsk->active_mm); |
1da177e4c Linux-2.6.12-rc2 |
652 653 654 655 656 657 |
/* more a memory barrier than a real lock */ task_lock(tsk); tsk->mm = NULL; up_read(&mm->mmap_sem); enter_lazy_tlb(mm, current); task_unlock(tsk); |
cf475ad28 cgroups: add an o... |
658 |
mm_update_next_owner(mm); |
1da177e4c Linux-2.6.12-rc2 |
659 660 |
mmput(mm); } |
1da177e4c Linux-2.6.12-rc2 |
661 662 663 664 |
/* * When we die, we re-parent all our children. * Try to give them to another thread in our thread * group, and if no such member exists, give it to |
84d737866 [PATCH] add child... |
665 666 |
* the child reaper process (ie "init") in our pid * space. |
1da177e4c Linux-2.6.12-rc2 |
667 |
*/ |
950bbabb5 pid_ns: (BUG 1139... |
668 |
static struct task_struct *find_new_reaper(struct task_struct *father) |
d16e15f5b exit: add lock co... |
669 670 |
__releases(&tasklist_lock) __acquires(&tasklist_lock) |
1da177e4c Linux-2.6.12-rc2 |
671 |
{ |
950bbabb5 pid_ns: (BUG 1139... |
672 673 |
struct pid_namespace *pid_ns = task_active_pid_ns(father); struct task_struct *thread; |
1da177e4c Linux-2.6.12-rc2 |
674 |
|
950bbabb5 pid_ns: (BUG 1139... |
675 676 677 678 679 680 681 682 |
thread = father; while_each_thread(father, thread) { if (thread->flags & PF_EXITING) continue; if (unlikely(pid_ns->child_reaper == father)) pid_ns->child_reaper = thread; return thread; } |
1da177e4c Linux-2.6.12-rc2 |
683 |
|
950bbabb5 pid_ns: (BUG 1139... |
684 685 686 687 |
if (unlikely(pid_ns->child_reaper == father)) { write_unlock_irq(&tasklist_lock); if (unlikely(pid_ns == &init_pid_ns)) panic("Attempted to kill init!"); |
1da177e4c Linux-2.6.12-rc2 |
688 |
|
950bbabb5 pid_ns: (BUG 1139... |
689 690 |
zap_pid_ns_processes(pid_ns); write_lock_irq(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
691 |
/* |
950bbabb5 pid_ns: (BUG 1139... |
692 693 694 |
* We can not clear ->child_reaper or leave it alone. * There may by stealth EXIT_DEAD tasks on ->children, * forget_original_parent() must move them somewhere. |
1da177e4c Linux-2.6.12-rc2 |
695 |
*/ |
950bbabb5 pid_ns: (BUG 1139... |
696 |
pid_ns->child_reaper = init_pid_ns.child_reaper; |
1da177e4c Linux-2.6.12-rc2 |
697 |
} |
762a24bee pid namespaces: r... |
698 |
|
950bbabb5 pid_ns: (BUG 1139... |
699 700 |
return pid_ns->child_reaper; } |
5dfc80be7 forget_original_p... |
701 702 703 |
/* * Any that need to be release_task'd are put on the @dead list. */ |
9cd80bbb0 do_wait() optimiz... |
704 |
static void reparent_leader(struct task_struct *father, struct task_struct *p, |
5dfc80be7 forget_original_p... |
705 706 |
struct list_head *dead) { |
5dfc80be7 forget_original_p... |
707 |
list_move_tail(&p->sibling, &p->real_parent->children); |
0976a03e5 reparent_leader: ... |
708 |
if (p->exit_state == EXIT_DEAD) |
5dfc80be7 forget_original_p... |
709 710 711 712 713 714 715 716 717 718 719 720 |
return; /* * If this is a threaded reparent there is no need to * notify anyone anything has happened. */ if (same_thread_group(p->real_parent, father)) 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. */ |
d21142ece ptrace: kill task... |
721 |
if (!p->ptrace && |
5dfc80be7 forget_original_p... |
722 |
p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) { |
867734737 make do_notify_pa... |
723 |
if (do_notify_parent(p, p->exit_signal)) { |
5dfc80be7 forget_original_p... |
724 725 726 727 728 729 730 |
p->exit_state = EXIT_DEAD; list_move_tail(&p->sibling, dead); } } kill_orphaned_pgrp(p, father); } |
762a24bee pid namespaces: r... |
731 |
static void forget_original_parent(struct task_struct *father) |
1da177e4c Linux-2.6.12-rc2 |
732 |
{ |
950bbabb5 pid_ns: (BUG 1139... |
733 |
struct task_struct *p, *n, *reaper; |
5dfc80be7 forget_original_p... |
734 |
LIST_HEAD(dead_children); |
762a24bee pid namespaces: r... |
735 736 |
write_lock_irq(&tasklist_lock); |
c7e49c148 ptrace: optimize ... |
737 738 739 740 741 |
/* * Note that exit_ptrace() and find_new_reaper() might * drop tasklist_lock and reacquire it. */ exit_ptrace(father); |
950bbabb5 pid_ns: (BUG 1139... |
742 |
reaper = find_new_reaper(father); |
f470021ad ptrace children r... |
743 |
|
03ff17979 kernel/exit.c: Us... |
744 |
list_for_each_entry_safe(p, n, &father->children, sibling) { |
9cd80bbb0 do_wait() optimiz... |
745 746 747 748 |
struct task_struct *t = p; do { t->real_parent = reaper; if (t->parent == father) { |
d21142ece ptrace: kill task... |
749 |
BUG_ON(t->ptrace); |
9cd80bbb0 do_wait() optimiz... |
750 751 752 753 754 755 756 |
t->parent = t->real_parent; } if (t->pdeath_signal) group_send_sig_info(t->pdeath_signal, SEND_SIG_NOINFO, t); } while_each_thread(p, t); reparent_leader(father, p, &dead_children); |
1da177e4c Linux-2.6.12-rc2 |
757 |
} |
762a24bee pid namespaces: r... |
758 |
write_unlock_irq(&tasklist_lock); |
5dfc80be7 forget_original_p... |
759 |
|
762a24bee pid namespaces: r... |
760 |
BUG_ON(!list_empty(&father->children)); |
762a24bee pid namespaces: r... |
761 |
|
5dfc80be7 forget_original_p... |
762 763 |
list_for_each_entry_safe(p, n, &dead_children, sibling) { list_del_init(&p->sibling); |
39c626ae4 forget_original_p... |
764 765 |
release_task(p); } |
1da177e4c Linux-2.6.12-rc2 |
766 767 768 769 770 771 |
} /* * Send signals to all our closest relatives so that they know * to properly mourn us.. */ |
821c7de71 exit_notify: fix ... |
772 |
static void exit_notify(struct task_struct *tsk, int group_dead) |
1da177e4c Linux-2.6.12-rc2 |
773 |
{ |
53c8f9f19 make do_notify_pa... |
774 |
bool autoreap; |
1da177e4c Linux-2.6.12-rc2 |
775 |
|
1da177e4c Linux-2.6.12-rc2 |
776 777 778 779 780 781 782 783 |
/* * 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) */ |
762a24bee pid namespaces: r... |
784 |
forget_original_parent(tsk); |
2e4a70726 pid namespaces: m... |
785 |
exit_task_namespaces(tsk); |
1da177e4c Linux-2.6.12-rc2 |
786 |
|
762a24bee pid namespaces: r... |
787 |
write_lock_irq(&tasklist_lock); |
821c7de71 exit_notify: fix ... |
788 789 |
if (group_dead) kill_orphaned_pgrp(tsk->group_leader, NULL); |
1da177e4c Linux-2.6.12-rc2 |
790 |
|
247284481 Kill some obsolet... |
791 |
/* Let father know we died |
1da177e4c Linux-2.6.12-rc2 |
792 793 |
* * Thread signals are configurable, but you aren't going to use |
25985edce Fix common misspe... |
794 |
* that to send signals to arbitrary processes. |
1da177e4c Linux-2.6.12-rc2 |
795 796 797 798 799 800 801 802 803 |
* That stops right now. * * If the parent exec id doesn't match the exec id we saved * when we started then we know the parent has changed security * domain. * * If our self_exec id doesn't match our parent_exec_id then * we have changed execution domain as these two values started * the same after a fork. |
1da177e4c Linux-2.6.12-rc2 |
804 |
*/ |
45cdf5cc0 kill tracehook_no... |
805 |
if (thread_group_leader(tsk) && tsk->exit_signal != SIGCHLD && |
f49ee505b introduce kill_or... |
806 |
(tsk->parent_exec_id != tsk->real_parent->self_exec_id || |
432870dab exit_notify: kill... |
807 |
tsk->self_exec_id != tsk->parent_exec_id)) |
1da177e4c Linux-2.6.12-rc2 |
808 |
tsk->exit_signal = SIGCHLD; |
45cdf5cc0 kill tracehook_no... |
809 810 811 812 813 814 815 816 817 818 819 820 |
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; } |
1da177e4c Linux-2.6.12-rc2 |
821 |
|
53c8f9f19 make do_notify_pa... |
822 |
tsk->exit_state = autoreap ? EXIT_DEAD : EXIT_ZOMBIE; |
1da177e4c Linux-2.6.12-rc2 |
823 |
|
9c3391684 exit: exit_notify... |
824 825 |
/* mt-exec, de_thread() is waiting for group leader */ if (unlikely(tsk->signal->notify_count < 0)) |
6db840fa7 exec: RT sub-thre... |
826 |
wake_up_process(tsk->signal->group_exit_task); |
1da177e4c Linux-2.6.12-rc2 |
827 |
write_unlock_irq(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
828 |
/* If the process is dead, release it - nobody will wait for it */ |
53c8f9f19 make do_notify_pa... |
829 |
if (autoreap) |
1da177e4c Linux-2.6.12-rc2 |
830 |
release_task(tsk); |
1da177e4c Linux-2.6.12-rc2 |
831 |
} |
e18eecb8b Add generic exit-... |
832 833 834 835 836 |
#ifdef CONFIG_DEBUG_STACK_USAGE static void check_stack_usage(void) { static DEFINE_SPINLOCK(low_water_lock); static int lowest_to_date = THREAD_SIZE; |
e18eecb8b Add generic exit-... |
837 |
unsigned long free; |
7c9f8861e stackprotector: u... |
838 |
free = stack_not_used(current); |
e18eecb8b Add generic exit-... |
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 |
if (free >= lowest_to_date) return; spin_lock(&low_water_lock); if (free < lowest_to_date) { printk(KERN_WARNING "%s used greatest stack depth: %lu bytes " "left ", current->comm, free); lowest_to_date = free; } spin_unlock(&low_water_lock); } #else static inline void check_stack_usage(void) {} #endif |
9402c95f3 treewide: remove ... |
856 |
void do_exit(long code) |
1da177e4c Linux-2.6.12-rc2 |
857 858 859 860 861 |
{ struct task_struct *tsk = current; int group_dead; profile_task_exit(tsk); |
73c101011 block: initial pa... |
862 |
WARN_ON(blk_needs_flush_plug(tsk)); |
22e2c507c [PATCH] Update cf... |
863 |
|
1da177e4c Linux-2.6.12-rc2 |
864 865 866 867 |
if (unlikely(in_interrupt())) panic("Aiee, killing interrupt handler!"); if (unlikely(!tsk->pid)) panic("Attempted to kill the idle task!"); |
1da177e4c Linux-2.6.12-rc2 |
868 |
|
33dd94ae1 do_exit(): make s... |
869 870 871 872 873 874 875 876 |
/* * 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); |
a288eecce ptrace: kill triv... |
877 |
ptrace_event(PTRACE_EVENT_EXIT, code); |
1da177e4c Linux-2.6.12-rc2 |
878 |
|
e0e817392 CRED: Add some co... |
879 |
validate_creds_for_do_exit(tsk); |
df164db5f [PATCH] avoid res... |
880 881 882 883 884 885 886 887 |
/* * 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)) { printk(KERN_ALERT "Fixing recursive fault but reboot is needed! "); |
778e9a9c3 pi-futex: fix exi... |
888 889 890 891 892 893 894 895 896 897 |
/* * 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; |
df164db5f [PATCH] avoid res... |
898 899 900 |
set_current_state(TASK_UNINTERRUPTIBLE); schedule(); } |
3aa551c9b genirq: add threa... |
901 |
exit_irq_thread(); |
d12619b5f fix group stop wi... |
902 |
exit_signals(tsk); /* sets PF_EXITING */ |
778e9a9c3 pi-futex: fix exi... |
903 904 905 906 |
/* * tsk->flags are checked in the futex code to protect against * an exiting task cleaning up the robust pi futexes. */ |
d2ee7198c pi-futex: set PF_... |
907 |
smp_mb(); |
1d6154825 sched: Convert pi... |
908 |
raw_spin_unlock_wait(&tsk->pi_lock); |
1da177e4c Linux-2.6.12-rc2 |
909 |
|
1da177e4c Linux-2.6.12-rc2 |
910 911 912 |
if (unlikely(in_atomic())) printk(KERN_INFO "note: %s[%d] exited with preempt_count %d ", |
ba25f9dcc Use helpers to ob... |
913 |
current->comm, task_pid_nr(current), |
1da177e4c Linux-2.6.12-rc2 |
914 915 916 |
preempt_count()); acct_update_integrals(tsk); |
34e55232e mm: avoid false s... |
917 |
/* sync mm's RSS info before statistics gathering */ |
a3a2e76c7 mm: avoid null-po... |
918 919 |
if (tsk->mm) sync_mm_rss(tsk, tsk->mm); |
1da177e4c Linux-2.6.12-rc2 |
920 |
group_dead = atomic_dec_and_test(&tsk->signal->live); |
c30689516 [PATCH] revert "t... |
921 |
if (group_dead) { |
778e9a9c3 pi-futex: fix exi... |
922 |
hrtimer_cancel(&tsk->signal->real_timer); |
25f407f0b [PATCH] Call exit... |
923 |
exit_itimers(tsk->signal); |
1f10206cf getrusage: fill r... |
924 925 |
if (tsk->mm) setmax_mm_hiwater_rss(&tsk->signal->maxrss, tsk->mm); |
c30689516 [PATCH] revert "t... |
926 |
} |
f6ec29a42 [PATCH] pacct: av... |
927 |
acct_collect(code, group_dead); |
522ed7767 Audit: add TTY in... |
928 929 |
if (group_dead) tty_audit_exit(); |
fa84cb935 [PATCH] move call... |
930 931 |
if (unlikely(tsk->audit_context)) audit_free(tsk); |
115085ea0 [PATCH] taskstats... |
932 |
|
f2ab6d888 Assign task_struc... |
933 |
tsk->exit_code = code; |
115085ea0 [PATCH] taskstats... |
934 |
taskstats_exit(tsk, group_dead); |
c757249af [PATCH] per-task-... |
935 |
|
1da177e4c Linux-2.6.12-rc2 |
936 |
exit_mm(tsk); |
0e4648141 [PATCH] pacct: ad... |
937 |
if (group_dead) |
f6ec29a42 [PATCH] pacct: av... |
938 |
acct_process(); |
0a16b6075 tracing, sched: L... |
939 |
trace_sched_process_exit(tsk); |
1da177e4c Linux-2.6.12-rc2 |
940 |
exit_sem(tsk); |
b34a6b1da ipc: introduce sh... |
941 |
exit_shm(tsk); |
1ec7f1ddb [PATCH] get rid o... |
942 943 |
exit_files(tsk); exit_fs(tsk); |
e18eecb8b Add generic exit-... |
944 |
check_stack_usage(); |
1da177e4c Linux-2.6.12-rc2 |
945 |
exit_thread(); |
0b3fcf178 perf_events: Move... |
946 947 948 949 950 951 952 953 |
/* * 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); |
b4f48b636 Task Control Grou... |
954 |
cgroup_exit(tsk, 1); |
1da177e4c Linux-2.6.12-rc2 |
955 |
|
5ec93d115 tty: Move the lea... |
956 |
if (group_dead) |
1da177e4c Linux-2.6.12-rc2 |
957 |
disassociate_ctty(1); |
a1261f546 [PATCH] m68k: int... |
958 |
module_put(task_thread_info(tsk)->exec_domain->module); |
1da177e4c Linux-2.6.12-rc2 |
959 |
|
9f46080c4 [PATCH] Process E... |
960 |
proc_exit_connector(tsk); |
33b2fb303 perf_counter: fix... |
961 962 |
/* |
24f1e32c6 hw-breakpoints: R... |
963 964 |
* FIXME: do that only when needed, using sched_exit tracepoint */ |
bf26c0184 ptrace: Prepare t... |
965 |
ptrace_put_breakpoints(tsk); |
33b2fb303 perf_counter: fix... |
966 |
|
821c7de71 exit_notify: fix ... |
967 |
exit_notify(tsk, group_dead); |
1da177e4c Linux-2.6.12-rc2 |
968 |
#ifdef CONFIG_NUMA |
c0ff7453b cpuset,mm: fix no... |
969 |
task_lock(tsk); |
f0be3d32b mempolicy: rename... |
970 |
mpol_put(tsk->mempolicy); |
1da177e4c Linux-2.6.12-rc2 |
971 |
tsk->mempolicy = NULL; |
c0ff7453b cpuset,mm: fix no... |
972 |
task_unlock(tsk); |
1da177e4c Linux-2.6.12-rc2 |
973 |
#endif |
42b2dd0a0 Shrink task_struc... |
974 |
#ifdef CONFIG_FUTEX |
c87e2837b [PATCH] pi-futex:... |
975 976 |
if (unlikely(current->pi_state_cache)) kfree(current->pi_state_cache); |
42b2dd0a0 Shrink task_struc... |
977 |
#endif |
c87e2837b [PATCH] pi-futex:... |
978 |
/* |
9a11b49a8 [PATCH] lockdep: ... |
979 |
* Make sure we are holding no locks: |
de5097c2e [PATCH] mutex sub... |
980 |
*/ |
9a11b49a8 [PATCH] lockdep: ... |
981 |
debug_check_no_locks_held(tsk); |
778e9a9c3 pi-futex: fix exi... |
982 983 984 985 986 987 |
/* * 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; |
1da177e4c Linux-2.6.12-rc2 |
988 |
|
afc847b7d [PATCH] don't do ... |
989 |
if (tsk->io_context) |
b69f22920 block: Fix io_con... |
990 |
exit_io_context(tsk); |
afc847b7d [PATCH] don't do ... |
991 |
|
b92ce5589 [PATCH] splice: a... |
992 993 |
if (tsk->splice_pipe) __free_pipe_info(tsk->splice_pipe); |
e0e817392 CRED: Add some co... |
994 |
validate_creds_for_do_exit(tsk); |
7407251a0 [PATCH] PF_DEAD c... |
995 |
preempt_disable(); |
54848d73f writeback: charge... |
996 997 |
if (tsk->nr_dirtied) __this_cpu_add(dirty_throttle_leaks, tsk->nr_dirtied); |
f41d911f8 rcu: Merge preemp... |
998 |
exit_rcu(); |
55a101f8f [PATCH] kill PF_D... |
999 |
/* causes final put_task_struct in finish_task_switch(). */ |
c394cc9fb [PATCH] introduce... |
1000 |
tsk->state = TASK_DEAD; |
a585042f7 freezer: remove r... |
1001 |
tsk->flags |= PF_NOFREEZE; /* tell freezer to ignore us */ |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 1004 |
schedule(); BUG(); /* Avoid "noreturn function does return". */ |
54306cf04 [PATCH] exit: fix... |
1005 1006 |
for (;;) cpu_relax(); /* For when BUG is null */ |
1da177e4c Linux-2.6.12-rc2 |
1007 |
} |
012914dad [patch] MCA recov... |
1008 |
EXPORT_SYMBOL_GPL(do_exit); |
9402c95f3 treewide: remove ... |
1009 |
void complete_and_exit(struct completion *comp, long code) |
1da177e4c Linux-2.6.12-rc2 |
1010 1011 1012 |
{ if (comp) complete(comp); |
55a101f8f [PATCH] kill PF_D... |
1013 |
|
1da177e4c Linux-2.6.12-rc2 |
1014 1015 1016 1017 |
do_exit(code); } EXPORT_SYMBOL(complete_and_exit); |
754fe8d29 [CVE-2009-0029] S... |
1018 |
SYSCALL_DEFINE1(exit, int, error_code) |
1da177e4c Linux-2.6.12-rc2 |
1019 1020 1021 |
{ do_exit((error_code&0xff)<<8); } |
1da177e4c Linux-2.6.12-rc2 |
1022 1023 1024 1025 |
/* * Take down every thread in the group. This is called by fatal signals * as well as by sys_exit_group (below). */ |
9402c95f3 treewide: remove ... |
1026 |
void |
1da177e4c Linux-2.6.12-rc2 |
1027 1028 |
do_group_exit(int exit_code) { |
bfc4b0890 signals: do_group... |
1029 |
struct signal_struct *sig = current->signal; |
1da177e4c Linux-2.6.12-rc2 |
1030 |
BUG_ON(exit_code & 0x80); /* core dumps don't get here */ |
bfc4b0890 signals: do_group... |
1031 1032 |
if (signal_group_exit(sig)) exit_code = sig->group_exit_code; |
1da177e4c Linux-2.6.12-rc2 |
1033 |
else if (!thread_group_empty(current)) { |
1da177e4c Linux-2.6.12-rc2 |
1034 |
struct sighand_struct *const sighand = current->sighand; |
1da177e4c Linux-2.6.12-rc2 |
1035 |
spin_lock_irq(&sighand->siglock); |
ed5d2cac1 exec: rework the ... |
1036 |
if (signal_group_exit(sig)) |
1da177e4c Linux-2.6.12-rc2 |
1037 1038 1039 |
/* Another thread got here before we took the lock. */ exit_code = sig->group_exit_code; else { |
1da177e4c Linux-2.6.12-rc2 |
1040 |
sig->group_exit_code = exit_code; |
ed5d2cac1 exec: rework the ... |
1041 |
sig->flags = SIGNAL_GROUP_EXIT; |
1da177e4c Linux-2.6.12-rc2 |
1042 1043 1044 |
zap_other_threads(current); } spin_unlock_irq(&sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 |
} do_exit(exit_code); /* NOTREACHED */ } /* * 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. */ |
754fe8d29 [CVE-2009-0029] S... |
1056 |
SYSCALL_DEFINE1(exit_group, int, error_code) |
1da177e4c Linux-2.6.12-rc2 |
1057 1058 |
{ do_group_exit((error_code & 0xff) << 8); |
2ed7c03ec [CVE-2009-0029] C... |
1059 1060 |
/* NOTREACHED */ return 0; |
1da177e4c Linux-2.6.12-rc2 |
1061 |
} |
9e8ae01d1 introduce "struct... |
1062 1063 |
struct wait_opts { enum pid_type wo_type; |
9e8ae01d1 introduce "struct... |
1064 |
int wo_flags; |
e1eb1ebcc mm: exit.c reorde... |
1065 |
struct pid *wo_pid; |
9e8ae01d1 introduce "struct... |
1066 1067 1068 1069 |
struct siginfo __user *wo_info; int __user *wo_stat; struct rusage __user *wo_rusage; |
0b7570e77 do_wait() wakeup ... |
1070 |
wait_queue_t child_wait; |
9e8ae01d1 introduce "struct... |
1071 1072 |
int notask_error; }; |
989264f46 do_wait-wakeup-op... |
1073 1074 |
static inline struct pid *task_pid_type(struct task_struct *task, enum pid_type type) |
161550d74 pid: sys_wait... ... |
1075 |
{ |
989264f46 do_wait-wakeup-op... |
1076 1077 1078 |
if (type != PIDTYPE_PID) task = task->group_leader; return task->pids[type].pid; |
161550d74 pid: sys_wait... ... |
1079 |
} |
989264f46 do_wait-wakeup-op... |
1080 |
static int eligible_pid(struct wait_opts *wo, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
1081 |
{ |
5c01ba49e do_wait-wakeup-op... |
1082 1083 1084 |
return wo->wo_type == PIDTYPE_MAX || task_pid_type(p, wo->wo_type) == wo->wo_pid; } |
1da177e4c Linux-2.6.12-rc2 |
1085 |
|
5c01ba49e do_wait-wakeup-op... |
1086 1087 1088 1089 |
static int eligible_child(struct wait_opts *wo, struct task_struct *p) { if (!eligible_pid(wo, p)) return 0; |
1da177e4c Linux-2.6.12-rc2 |
1090 1091 1092 1093 1094 |
/* Wait for all children (clone and not) if __WALL is set; * 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.) */ |
9e8ae01d1 introduce "struct... |
1095 1096 |
if (((p->exit_signal != SIGCHLD) ^ !!(wo->wo_flags & __WCLONE)) && !(wo->wo_flags & __WALL)) |
1da177e4c Linux-2.6.12-rc2 |
1097 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1098 |
|
14dd0b814 do_wait: return s... |
1099 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
1100 |
} |
9e8ae01d1 introduce "struct... |
1101 1102 |
static int wait_noreap_copyout(struct wait_opts *wo, struct task_struct *p, pid_t pid, uid_t uid, int why, int status) |
1da177e4c Linux-2.6.12-rc2 |
1103 |
{ |
9e8ae01d1 introduce "struct... |
1104 1105 1106 |
struct siginfo __user *infop; int retval = wo->wo_rusage ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0; |
36c8b5868 [PATCH] sched: cl... |
1107 |
|
1da177e4c Linux-2.6.12-rc2 |
1108 |
put_task_struct(p); |
9e8ae01d1 introduce "struct... |
1109 |
infop = wo->wo_info; |
b6fe2d117 wait_noreap_copyo... |
1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 |
if (infop) { if (!retval) retval = put_user(SIGCHLD, &infop->si_signo); if (!retval) retval = put_user(0, &infop->si_errno); if (!retval) retval = put_user((short)why, &infop->si_code); if (!retval) retval = put_user(pid, &infop->si_pid); if (!retval) retval = put_user(uid, &infop->si_uid); if (!retval) retval = put_user(status, &infop->si_status); } |
1da177e4c Linux-2.6.12-rc2 |
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 |
if (!retval) retval = pid; return retval; } /* * 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. */ |
9e8ae01d1 introduce "struct... |
1135 |
static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
1136 1137 |
{ unsigned long state; |
2f4e6e2a8 wait_task_zombie:... |
1138 |
int retval, status, traced; |
6c5f3e7b4 Pidns: make full ... |
1139 |
pid_t pid = task_pid_vnr(p); |
c69e8d9c0 CRED: Use RCU to ... |
1140 |
uid_t uid = __task_cred(p)->uid; |
9e8ae01d1 introduce "struct... |
1141 |
struct siginfo __user *infop; |
1da177e4c Linux-2.6.12-rc2 |
1142 |
|
9e8ae01d1 introduce "struct... |
1143 |
if (!likely(wo->wo_flags & WEXITED)) |
98abed020 do_wait reorganiz... |
1144 |
return 0; |
9e8ae01d1 introduce "struct... |
1145 |
if (unlikely(wo->wo_flags & WNOWAIT)) { |
1da177e4c Linux-2.6.12-rc2 |
1146 |
int exit_code = p->exit_code; |
f3abd4f95 kernel/exit.c: fi... |
1147 |
int why; |
1da177e4c Linux-2.6.12-rc2 |
1148 |
|
1da177e4c Linux-2.6.12-rc2 |
1149 1150 1151 1152 1153 1154 1155 1156 1157 |
get_task_struct(p); read_unlock(&tasklist_lock); if ((exit_code & 0x7f) == 0) { why = CLD_EXITED; status = exit_code >> 8; } else { why = (exit_code & 0x80) ? CLD_DUMPED : CLD_KILLED; status = exit_code & 0x7f; } |
9e8ae01d1 introduce "struct... |
1158 |
return wait_noreap_copyout(wo, p, pid, uid, why, status); |
1da177e4c Linux-2.6.12-rc2 |
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 |
} /* * Try to move the task's state to DEAD * only one thread is allowed to do this: */ state = xchg(&p->exit_state, EXIT_DEAD); if (state != EXIT_ZOMBIE) { BUG_ON(state != EXIT_DEAD); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1170 |
|
53b6f9fbd ptrace: introduce... |
1171 |
traced = ptrace_reparented(p); |
befca9677 ptrace: wait_task... |
1172 1173 |
/* * It can be ptraced but not reparented, check |
e550f14dc kill task_detached() |
1174 |
* thread_group_leader() to filter out sub-threads. |
befca9677 ptrace: wait_task... |
1175 |
*/ |
e550f14dc kill task_detached() |
1176 |
if (likely(!traced) && thread_group_leader(p)) { |
3795e1616 [PATCH] Decrease ... |
1177 1178 |
struct signal_struct *psig; struct signal_struct *sig; |
1f10206cf getrusage: fill r... |
1179 |
unsigned long maxrss; |
0cf55e1ec sched, cputime: I... |
1180 |
cputime_t tgutime, tgstime; |
3795e1616 [PATCH] Decrease ... |
1181 |
|
1da177e4c Linux-2.6.12-rc2 |
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 |
/* * 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 they are only touched by * __exit_signal, which runs with tasklist_lock * write-locked anyway, and so is excluded here. We do |
d1e98f429 ptrace: wait_task... |
1193 |
* need to protect the access to parent->signal fields, |
1da177e4c Linux-2.6.12-rc2 |
1194 1195 |
* as other threads in the parent group can be right * here reaping other children at the same time. |
0cf55e1ec sched, cputime: I... |
1196 1197 1198 1199 |
* * We use thread_group_times() to get times for the thread * group, which consolidates times for all threads in the * group including the group leader. |
1da177e4c Linux-2.6.12-rc2 |
1200 |
*/ |
0cf55e1ec sched, cputime: I... |
1201 |
thread_group_times(p, &tgutime, &tgstime); |
d1e98f429 ptrace: wait_task... |
1202 1203 |
spin_lock_irq(&p->real_parent->sighand->siglock); psig = p->real_parent->signal; |
3795e1616 [PATCH] Decrease ... |
1204 |
sig = p->signal; |
648616343 [S390] cputime: a... |
1205 1206 1207 |
psig->cutime += tgutime + sig->cutime; psig->cstime += tgstime + sig->cstime; psig->cgtime += p->gtime + sig->gtime + sig->cgtime; |
3795e1616 [PATCH] Decrease ... |
1208 1209 1210 1211 1212 1213 1214 1215 |
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; |
6eaeeaba3 getrusage(): fill... |
1216 1217 1218 1219 1220 1221 |
psig->cinblock += task_io_get_inblock(p) + sig->inblock + sig->cinblock; psig->coublock += task_io_get_oublock(p) + sig->oublock + sig->coublock; |
1f10206cf getrusage: fill r... |
1222 1223 1224 |
maxrss = max(sig->maxrss, sig->cmaxrss); if (psig->cmaxrss < maxrss) psig->cmaxrss = maxrss; |
5995477ab task IO accountin... |
1225 1226 |
task_io_accounting_add(&psig->ioac, &p->ioac); task_io_accounting_add(&psig->ioac, &sig->ioac); |
d1e98f429 ptrace: wait_task... |
1227 |
spin_unlock_irq(&p->real_parent->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1228 1229 1230 1231 1232 1233 1234 |
} /* * Now we are sure this task is interesting, and no other * thread can reap it because we set its state to EXIT_DEAD. */ read_unlock(&tasklist_lock); |
9e8ae01d1 introduce "struct... |
1235 1236 |
retval = wo->wo_rusage ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0; |
1da177e4c Linux-2.6.12-rc2 |
1237 1238 |
status = (p->signal->flags & SIGNAL_GROUP_EXIT) ? p->signal->group_exit_code : p->exit_code; |
9e8ae01d1 introduce "struct... |
1239 1240 1241 1242 |
if (!retval && wo->wo_stat) retval = put_user(status, wo->wo_stat); infop = wo->wo_info; |
1da177e4c Linux-2.6.12-rc2 |
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 |
if (!retval && infop) retval = put_user(SIGCHLD, &infop->si_signo); if (!retval && infop) retval = put_user(0, &infop->si_errno); if (!retval && infop) { int why; if ((status & 0x7f) == 0) { why = CLD_EXITED; status >>= 8; } else { why = (status & 0x80) ? CLD_DUMPED : CLD_KILLED; status &= 0x7f; } retval = put_user((short)why, &infop->si_code); if (!retval) retval = put_user(status, &infop->si_status); } if (!retval && infop) |
3a515e4a6 wait_task_continu... |
1262 |
retval = put_user(pid, &infop->si_pid); |
1da177e4c Linux-2.6.12-rc2 |
1263 |
if (!retval && infop) |
c69e8d9c0 CRED: Use RCU to ... |
1264 |
retval = put_user(uid, &infop->si_uid); |
2f4e6e2a8 wait_task_zombie:... |
1265 |
if (!retval) |
3a515e4a6 wait_task_continu... |
1266 |
retval = pid; |
2f4e6e2a8 wait_task_zombie:... |
1267 1268 |
if (traced) { |
1da177e4c Linux-2.6.12-rc2 |
1269 |
write_lock_irq(&tasklist_lock); |
2f4e6e2a8 wait_task_zombie:... |
1270 1271 1272 |
/* We dropped tasklist, ptracer could die and untrace */ ptrace_unlink(p); /* |
867734737 make do_notify_pa... |
1273 1274 |
* If this is not a sub-thread, notify the parent. * If parent wants a zombie, don't release it now. |
2f4e6e2a8 wait_task_zombie:... |
1275 |
*/ |
867734737 make do_notify_pa... |
1276 1277 1278 1279 |
if (thread_group_leader(p) && !do_notify_parent(p, p->exit_signal)) { p->exit_state = EXIT_ZOMBIE; p = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1280 1281 1282 1283 1284 |
} write_unlock_irq(&tasklist_lock); } if (p != NULL) release_task(p); |
2f4e6e2a8 wait_task_zombie:... |
1285 |
|
1da177e4c Linux-2.6.12-rc2 |
1286 1287 |
return retval; } |
90bc8d8b1 do_wait: fix wait... |
1288 1289 1290 |
static int *task_stopped_code(struct task_struct *p, bool ptrace) { if (ptrace) { |
544b2c91a ptrace: implement... |
1291 1292 |
if (task_is_stopped_or_traced(p) && !(p->jobctl & JOBCTL_LISTENING)) |
90bc8d8b1 do_wait: fix wait... |
1293 1294 1295 1296 1297 1298 1299 |
return &p->exit_code; } else { if (p->signal->flags & SIGNAL_STOP_STOPPED) return &p->signal->group_exit_code; } return NULL; } |
19e274630 job control: reor... |
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 |
/** * 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. |
1da177e4c Linux-2.6.12-rc2 |
1317 |
*/ |
9e8ae01d1 introduce "struct... |
1318 1319 |
static int wait_task_stopped(struct wait_opts *wo, int ptrace, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
1320 |
{ |
9e8ae01d1 introduce "struct... |
1321 |
struct siginfo __user *infop; |
90bc8d8b1 do_wait: fix wait... |
1322 |
int retval, exit_code, *p_code, why; |
ee7c82da8 wait_task_stopped... |
1323 |
uid_t uid = 0; /* unneeded, required by compiler */ |
c89507835 wait_task_stopped... |
1324 |
pid_t pid; |
1da177e4c Linux-2.6.12-rc2 |
1325 |
|
47918025e shift "ptrace imp... |
1326 1327 1328 |
/* * Traditionally we see ptrace'd stopped tasks regardless of options. */ |
9e8ae01d1 introduce "struct... |
1329 |
if (!ptrace && !(wo->wo_flags & WUNTRACED)) |
98abed020 do_wait reorganiz... |
1330 |
return 0; |
19e274630 job control: reor... |
1331 1332 |
if (!task_stopped_code(p, ptrace)) return 0; |
ee7c82da8 wait_task_stopped... |
1333 1334 |
exit_code = 0; spin_lock_irq(&p->sighand->siglock); |
90bc8d8b1 do_wait: fix wait... |
1335 1336 |
p_code = task_stopped_code(p, ptrace); if (unlikely(!p_code)) |
ee7c82da8 wait_task_stopped... |
1337 |
goto unlock_sig; |
90bc8d8b1 do_wait: fix wait... |
1338 |
exit_code = *p_code; |
ee7c82da8 wait_task_stopped... |
1339 1340 |
if (!exit_code) goto unlock_sig; |
9e8ae01d1 introduce "struct... |
1341 |
if (!unlikely(wo->wo_flags & WNOWAIT)) |
90bc8d8b1 do_wait: fix wait... |
1342 |
*p_code = 0; |
ee7c82da8 wait_task_stopped... |
1343 |
|
f362b7324 Fix unprotected a... |
1344 |
uid = task_uid(p); |
ee7c82da8 wait_task_stopped... |
1345 1346 1347 |
unlock_sig: spin_unlock_irq(&p->sighand->siglock); if (!exit_code) |
1da177e4c Linux-2.6.12-rc2 |
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 |
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); |
6c5f3e7b4 Pidns: make full ... |
1358 |
pid = task_pid_vnr(p); |
f470021ad ptrace children r... |
1359 |
why = ptrace ? CLD_TRAPPED : CLD_STOPPED; |
1da177e4c Linux-2.6.12-rc2 |
1360 |
read_unlock(&tasklist_lock); |
9e8ae01d1 introduce "struct... |
1361 1362 1363 1364 1365 1366 1367 |
if (unlikely(wo->wo_flags & WNOWAIT)) return wait_noreap_copyout(wo, p, pid, uid, why, exit_code); retval = wo->wo_rusage ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0; if (!retval && wo->wo_stat) retval = put_user((exit_code << 8) | 0x7f, wo->wo_stat); |
1da177e4c Linux-2.6.12-rc2 |
1368 |
|
9e8ae01d1 introduce "struct... |
1369 |
infop = wo->wo_info; |
1da177e4c Linux-2.6.12-rc2 |
1370 1371 1372 1373 1374 |
if (!retval && infop) retval = put_user(SIGCHLD, &infop->si_signo); if (!retval && infop) retval = put_user(0, &infop->si_errno); if (!retval && infop) |
6efcae460 Fix waitid si_cod... |
1375 |
retval = put_user((short)why, &infop->si_code); |
1da177e4c Linux-2.6.12-rc2 |
1376 1377 1378 |
if (!retval && infop) retval = put_user(exit_code, &infop->si_status); if (!retval && infop) |
c89507835 wait_task_stopped... |
1379 |
retval = put_user(pid, &infop->si_pid); |
1da177e4c Linux-2.6.12-rc2 |
1380 |
if (!retval && infop) |
ee7c82da8 wait_task_stopped... |
1381 |
retval = put_user(uid, &infop->si_uid); |
1da177e4c Linux-2.6.12-rc2 |
1382 |
if (!retval) |
c89507835 wait_task_stopped... |
1383 |
retval = pid; |
1da177e4c Linux-2.6.12-rc2 |
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 |
put_task_struct(p); BUG_ON(!retval); return retval; } /* * 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. */ |
9e8ae01d1 introduce "struct... |
1396 |
static int wait_task_continued(struct wait_opts *wo, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
1397 1398 1399 1400 |
{ int retval; pid_t pid; uid_t uid; |
9e8ae01d1 introduce "struct... |
1401 |
if (!unlikely(wo->wo_flags & WCONTINUED)) |
98abed020 do_wait reorganiz... |
1402 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1403 1404 1405 1406 1407 1408 1409 1410 1411 |
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; } |
9e8ae01d1 introduce "struct... |
1412 |
if (!unlikely(wo->wo_flags & WNOWAIT)) |
1da177e4c Linux-2.6.12-rc2 |
1413 |
p->signal->flags &= ~SIGNAL_STOP_CONTINUED; |
f362b7324 Fix unprotected a... |
1414 |
uid = task_uid(p); |
1da177e4c Linux-2.6.12-rc2 |
1415 |
spin_unlock_irq(&p->sighand->siglock); |
6c5f3e7b4 Pidns: make full ... |
1416 |
pid = task_pid_vnr(p); |
1da177e4c Linux-2.6.12-rc2 |
1417 1418 |
get_task_struct(p); read_unlock(&tasklist_lock); |
9e8ae01d1 introduce "struct... |
1419 1420 1421 |
if (!wo->wo_info) { retval = wo->wo_rusage ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0; |
1da177e4c Linux-2.6.12-rc2 |
1422 |
put_task_struct(p); |
9e8ae01d1 introduce "struct... |
1423 1424 |
if (!retval && wo->wo_stat) retval = put_user(0xffff, wo->wo_stat); |
1da177e4c Linux-2.6.12-rc2 |
1425 |
if (!retval) |
3a515e4a6 wait_task_continu... |
1426 |
retval = pid; |
1da177e4c Linux-2.6.12-rc2 |
1427 |
} else { |
9e8ae01d1 introduce "struct... |
1428 1429 |
retval = wait_noreap_copyout(wo, p, pid, uid, CLD_CONTINUED, SIGCONT); |
1da177e4c Linux-2.6.12-rc2 |
1430 1431 1432 1433 1434 |
BUG_ON(retval == 0); } return retval; } |
98abed020 do_wait reorganiz... |
1435 1436 1437 |
/* * Consider @p for a wait by @parent. * |
9e8ae01d1 introduce "struct... |
1438 |
* -ECHILD should be in ->notask_error before the first call. |
98abed020 do_wait reorganiz... |
1439 1440 |
* Returns nonzero for a final return, when we have unlocked tasklist_lock. * Returns zero if the search for a child should continue; |
9e8ae01d1 introduce "struct... |
1441 |
* then ->notask_error is 0 if @p is an eligible child, |
14dd0b814 do_wait: return s... |
1442 |
* or another error from security_task_wait(), or still -ECHILD. |
98abed020 do_wait reorganiz... |
1443 |
*/ |
b6e763f07 wait_consider_tas... |
1444 1445 |
static int wait_consider_task(struct wait_opts *wo, int ptrace, struct task_struct *p) |
98abed020 do_wait reorganiz... |
1446 |
{ |
9e8ae01d1 introduce "struct... |
1447 |
int ret = eligible_child(wo, p); |
14dd0b814 do_wait: return s... |
1448 |
if (!ret) |
98abed020 do_wait reorganiz... |
1449 |
return ret; |
a2322e1d2 do_wait() wakeup ... |
1450 |
ret = security_task_wait(p); |
14dd0b814 do_wait: return s... |
1451 1452 1453 1454 1455 1456 1457 1458 |
if (unlikely(ret < 0)) { /* * If we have not yet seen any eligible child, * then let this error code replace -ECHILD. * A permission error will give the user a clue * to look for security policy problems, rather * than for mysterious wait bugs. */ |
9e8ae01d1 introduce "struct... |
1459 1460 |
if (wo->notask_error) wo->notask_error = ret; |
78a3d9d56 do_wait: do take ... |
1461 |
return 0; |
14dd0b814 do_wait: return s... |
1462 |
} |
823b018e5 job control: Smal... |
1463 |
/* dead body doesn't have much to contribute */ |
50b8d2574 ptrace: partially... |
1464 1465 1466 1467 1468 1469 1470 |
if (unlikely(p->exit_state == EXIT_DEAD)) { /* * But do not ignore this task until the tracer does * wait_task_zombie()->do_notify_parent(). */ if (likely(!ptrace) && unlikely(ptrace_reparented(p))) wo->notask_error = 0; |
823b018e5 job control: Smal... |
1471 |
return 0; |
50b8d2574 ptrace: partially... |
1472 |
} |
823b018e5 job control: Smal... |
1473 |
|
45cb24a1d job control: Allo... |
1474 1475 |
/* slay zombie? */ if (p->exit_state == EXIT_ZOMBIE) { |
f470021ad ptrace children r... |
1476 |
/* |
45cb24a1d job control: Allo... |
1477 1478 1479 |
* A zombie ptracee is only visible to its ptracer. * Notification and reaping will be cascaded to the real * parent when the ptracer detaches. |
f470021ad ptrace children r... |
1480 |
*/ |
d21142ece ptrace: kill task... |
1481 |
if (likely(!ptrace) && unlikely(p->ptrace)) { |
45cb24a1d job control: Allo... |
1482 1483 1484 1485 |
/* it will become visible, clear notask_error */ wo->notask_error = 0; return 0; } |
f470021ad ptrace children r... |
1486 |
|
9b84cca25 job control: Fix ... |
1487 1488 1489 |
/* we don't reap group leaders with subthreads */ if (!delay_group_leader(p)) return wait_task_zombie(wo, p); |
98abed020 do_wait reorganiz... |
1490 |
|
f470021ad ptrace children r... |
1491 |
/* |
9b84cca25 job control: Fix ... |
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 |
* 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 { /* |
45cb24a1d job control: Allo... |
1515 1516 1517 1518 1519 1520 1521 1522 1523 |
* If @p is ptraced by a task in its real parent's group, * hide group stop/continued state when looking at @p as * the real parent; otherwise, a single stop can be * reported twice as group and ptrace stops. * * If a ptracer wants to distinguish the two events for its * own children, it should create a separate process which * takes the role of real parent. */ |
479bf98c1 ptrace: wait_cons... |
1524 |
if (likely(!ptrace) && p->ptrace && !ptrace_reparented(p)) |
45cb24a1d job control: Allo... |
1525 1526 1527 |
return 0; /* |
9b84cca25 job control: Fix ... |
1528 1529 |
* @p is alive and it's gonna stop, continue or exit, so * there always is something to wait for. |
f470021ad ptrace children r... |
1530 |
*/ |
9e8ae01d1 introduce "struct... |
1531 |
wo->notask_error = 0; |
f470021ad ptrace children r... |
1532 |
} |
98abed020 do_wait reorganiz... |
1533 |
/* |
45cb24a1d job control: Allo... |
1534 1535 |
* Wait for stopped. Depending on @ptrace, different stopped state * is used and the two don't interact with each other. |
98abed020 do_wait reorganiz... |
1536 |
*/ |
19e274630 job control: reor... |
1537 1538 1539 |
ret = wait_task_stopped(wo, ptrace, p); if (ret) return ret; |
98abed020 do_wait reorganiz... |
1540 1541 |
/* |
45cb24a1d job control: Allo... |
1542 1543 1544 |
* 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. |
98abed020 do_wait reorganiz... |
1545 |
*/ |
9e8ae01d1 introduce "struct... |
1546 |
return wait_task_continued(wo, p); |
98abed020 do_wait reorganiz... |
1547 1548 1549 1550 1551 |
} /* * Do the work of do_wait() for one thread in the group, @tsk. * |
9e8ae01d1 introduce "struct... |
1552 |
* -ECHILD should be in ->notask_error before the first call. |
98abed020 do_wait reorganiz... |
1553 1554 |
* Returns nonzero for a final return, when we have unlocked tasklist_lock. * Returns zero if the search for a child should continue; then |
9e8ae01d1 introduce "struct... |
1555 |
* ->notask_error is 0 if there were any eligible children, |
14dd0b814 do_wait: return s... |
1556 |
* or another error from security_task_wait(), or still -ECHILD. |
98abed020 do_wait reorganiz... |
1557 |
*/ |
9e8ae01d1 introduce "struct... |
1558 |
static int do_wait_thread(struct wait_opts *wo, struct task_struct *tsk) |
98abed020 do_wait reorganiz... |
1559 1560 1561 1562 |
{ struct task_struct *p; list_for_each_entry(p, &tsk->children, sibling) { |
9cd80bbb0 do_wait() optimiz... |
1563 1564 1565 |
int ret = wait_consider_task(wo, 0, p); if (ret) return ret; |
98abed020 do_wait reorganiz... |
1566 1567 1568 1569 |
} return 0; } |
9e8ae01d1 introduce "struct... |
1570 |
static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk) |
98abed020 do_wait reorganiz... |
1571 1572 |
{ struct task_struct *p; |
f470021ad ptrace children r... |
1573 |
list_for_each_entry(p, &tsk->ptraced, ptrace_entry) { |
b6e763f07 wait_consider_tas... |
1574 |
int ret = wait_consider_task(wo, 1, p); |
f470021ad ptrace children r... |
1575 |
if (ret) |
98abed020 do_wait reorganiz... |
1576 |
return ret; |
98abed020 do_wait reorganiz... |
1577 1578 1579 1580 |
} return 0; } |
0b7570e77 do_wait() wakeup ... |
1581 1582 1583 1584 1585 1586 |
static int child_wait_callback(wait_queue_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; |
5c01ba49e do_wait-wakeup-op... |
1587 |
if (!eligible_pid(wo, p)) |
0b7570e77 do_wait() wakeup ... |
1588 |
return 0; |
b4fe51823 do_wait() wakeup ... |
1589 1590 |
if ((wo->wo_flags & __WNOTHREAD) && wait->private != p->parent) return 0; |
0b7570e77 do_wait() wakeup ... |
1591 1592 |
return default_wake_function(wait, mode, sync, key); } |
a7f0765ed ptrace: __ptrace_... |
1593 1594 |
void __wake_up_parent(struct task_struct *p, struct task_struct *parent) { |
0b7570e77 do_wait() wakeup ... |
1595 1596 |
__wake_up_sync_key(&parent->signal->wait_chldexit, TASK_INTERRUPTIBLE, 1, p); |
a7f0765ed ptrace: __ptrace_... |
1597 |
} |
9e8ae01d1 introduce "struct... |
1598 |
static long do_wait(struct wait_opts *wo) |
1da177e4c Linux-2.6.12-rc2 |
1599 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1600 |
struct task_struct *tsk; |
98abed020 do_wait reorganiz... |
1601 |
int retval; |
1da177e4c Linux-2.6.12-rc2 |
1602 |
|
9e8ae01d1 introduce "struct... |
1603 |
trace_sched_process_wait(wo->wo_pid); |
0a16b6075 tracing, sched: L... |
1604 |
|
0b7570e77 do_wait() wakeup ... |
1605 1606 1607 |
init_waitqueue_func_entry(&wo->child_wait, child_wait_callback); wo->child_wait.private = current; add_wait_queue(¤t->signal->wait_chldexit, &wo->child_wait); |
1da177e4c Linux-2.6.12-rc2 |
1608 |
repeat: |
98abed020 do_wait reorganiz... |
1609 1610 |
/* * If there is nothing that can match our critiera just get out. |
9e8ae01d1 introduce "struct... |
1611 1612 1613 |
* 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. |
98abed020 do_wait reorganiz... |
1614 |
*/ |
64a16caf5 do_wait: simplify... |
1615 |
wo->notask_error = -ECHILD; |
9e8ae01d1 introduce "struct... |
1616 1617 |
if ((wo->wo_type < PIDTYPE_MAX) && (!wo->wo_pid || hlist_empty(&wo->wo_pid->tasks[wo->wo_type]))) |
64a16caf5 do_wait: simplify... |
1618 |
goto notask; |
161550d74 pid: sys_wait... ... |
1619 |
|
f95d39d10 do_wait: fix the ... |
1620 |
set_current_state(TASK_INTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
1621 1622 1623 |
read_lock(&tasklist_lock); tsk = current; do { |
64a16caf5 do_wait: simplify... |
1624 1625 1626 |
retval = do_wait_thread(wo, tsk); if (retval) goto end; |
9e8ae01d1 introduce "struct... |
1627 |
|
64a16caf5 do_wait: simplify... |
1628 1629 |
retval = ptrace_do_wait(wo, tsk); if (retval) |
98abed020 do_wait reorganiz... |
1630 |
goto end; |
98abed020 do_wait reorganiz... |
1631 |
|
9e8ae01d1 introduce "struct... |
1632 |
if (wo->wo_flags & __WNOTHREAD) |
1da177e4c Linux-2.6.12-rc2 |
1633 |
break; |
a3f6dfb72 do_wait: kill the... |
1634 |
} while_each_thread(current, tsk); |
1da177e4c Linux-2.6.12-rc2 |
1635 |
read_unlock(&tasklist_lock); |
f2cc3eb13 do_wait: fix secu... |
1636 |
|
64a16caf5 do_wait: simplify... |
1637 |
notask: |
9e8ae01d1 introduce "struct... |
1638 1639 |
retval = wo->notask_error; if (!retval && !(wo->wo_flags & WNOHANG)) { |
1da177e4c Linux-2.6.12-rc2 |
1640 |
retval = -ERESTARTSYS; |
98abed020 do_wait reorganiz... |
1641 1642 1643 1644 |
if (!signal_pending(current)) { schedule(); goto repeat; } |
1da177e4c Linux-2.6.12-rc2 |
1645 |
} |
1da177e4c Linux-2.6.12-rc2 |
1646 |
end: |
f95d39d10 do_wait: fix the ... |
1647 |
__set_current_state(TASK_RUNNING); |
0b7570e77 do_wait() wakeup ... |
1648 |
remove_wait_queue(¤t->signal->wait_chldexit, &wo->child_wait); |
1da177e4c Linux-2.6.12-rc2 |
1649 1650 |
return retval; } |
17da2bd90 [CVE-2009-0029] S... |
1651 1652 |
SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *, infop, int, options, struct rusage __user *, ru) |
1da177e4c Linux-2.6.12-rc2 |
1653 |
{ |
9e8ae01d1 introduce "struct... |
1654 |
struct wait_opts wo; |
161550d74 pid: sys_wait... ... |
1655 1656 |
struct pid *pid = NULL; enum pid_type type; |
1da177e4c Linux-2.6.12-rc2 |
1657 1658 1659 1660 1661 1662 1663 1664 1665 |
long ret; if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED)) return -EINVAL; if (!(options & (WEXITED|WSTOPPED|WCONTINUED))) return -EINVAL; switch (which) { case P_ALL: |
161550d74 pid: sys_wait... ... |
1666 |
type = PIDTYPE_MAX; |
1da177e4c Linux-2.6.12-rc2 |
1667 1668 |
break; case P_PID: |
161550d74 pid: sys_wait... ... |
1669 1670 |
type = PIDTYPE_PID; if (upid <= 0) |
1da177e4c Linux-2.6.12-rc2 |
1671 1672 1673 |
return -EINVAL; break; case P_PGID: |
161550d74 pid: sys_wait... ... |
1674 1675 |
type = PIDTYPE_PGID; if (upid <= 0) |
1da177e4c Linux-2.6.12-rc2 |
1676 |
return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1677 1678 1679 1680 |
break; default: return -EINVAL; } |
161550d74 pid: sys_wait... ... |
1681 1682 |
if (type < PIDTYPE_MAX) pid = find_get_pid(upid); |
9e8ae01d1 introduce "struct... |
1683 1684 1685 1686 1687 1688 1689 1690 |
wo.wo_type = type; wo.wo_pid = pid; wo.wo_flags = options; wo.wo_info = infop; wo.wo_stat = NULL; wo.wo_rusage = ru; ret = do_wait(&wo); |
dfe16dfa4 do_wait: fix sys_... |
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 |
if (ret > 0) { ret = 0; } else if (infop) { /* * For a WNOHANG return, clear out all the fields * we would set so the user can easily tell the * difference. */ if (!ret) ret = put_user(0, &infop->si_signo); if (!ret) ret = put_user(0, &infop->si_errno); if (!ret) ret = put_user(0, &infop->si_code); if (!ret) ret = put_user(0, &infop->si_pid); if (!ret) ret = put_user(0, &infop->si_uid); if (!ret) ret = put_user(0, &infop->si_status); } |
161550d74 pid: sys_wait... ... |
1713 |
put_pid(pid); |
1da177e4c Linux-2.6.12-rc2 |
1714 1715 |
/* avoid REGPARM breakage on x86: */ |
54a015104 asmlinkage_protec... |
1716 |
asmlinkage_protect(5, ret, which, upid, infop, options, ru); |
1da177e4c Linux-2.6.12-rc2 |
1717 1718 |
return ret; } |
754fe8d29 [CVE-2009-0029] S... |
1719 1720 |
SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr, int, options, struct rusage __user *, ru) |
1da177e4c Linux-2.6.12-rc2 |
1721 |
{ |
9e8ae01d1 introduce "struct... |
1722 |
struct wait_opts wo; |
161550d74 pid: sys_wait... ... |
1723 1724 |
struct pid *pid = NULL; enum pid_type type; |
1da177e4c Linux-2.6.12-rc2 |
1725 1726 1727 1728 1729 |
long ret; if (options & ~(WNOHANG|WUNTRACED|WCONTINUED| __WNOTHREAD|__WCLONE|__WALL)) return -EINVAL; |
161550d74 pid: sys_wait... ... |
1730 1731 1732 1733 1734 1735 1736 1737 |
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; |
2ae448efc pids: improve get... |
1738 |
pid = get_task_pid(current, PIDTYPE_PGID); |
161550d74 pid: sys_wait... ... |
1739 1740 1741 1742 |
} else /* upid > 0 */ { type = PIDTYPE_PID; pid = find_get_pid(upid); } |
9e8ae01d1 introduce "struct... |
1743 1744 1745 1746 1747 1748 1749 |
wo.wo_type = type; wo.wo_pid = pid; wo.wo_flags = options | WEXITED; wo.wo_info = NULL; wo.wo_stat = stat_addr; wo.wo_rusage = ru; ret = do_wait(&wo); |
161550d74 pid: sys_wait... ... |
1750 |
put_pid(pid); |
1da177e4c Linux-2.6.12-rc2 |
1751 1752 |
/* avoid REGPARM breakage on x86: */ |
54a015104 asmlinkage_protec... |
1753 |
asmlinkage_protect(4, ret, upid, stat_addr, options, ru); |
1da177e4c Linux-2.6.12-rc2 |
1754 1755 1756 1757 1758 1759 1760 1761 1762 |
return ret; } #ifdef __ARCH_WANT_SYS_WAITPID /* * sys_waitpid() remains for compatibility. waitpid() should be * implemented by calling sys_wait4() from libc.a. */ |
17da2bd90 [CVE-2009-0029] S... |
1763 |
SYSCALL_DEFINE3(waitpid, pid_t, pid, int __user *, stat_addr, int, options) |
1da177e4c Linux-2.6.12-rc2 |
1764 1765 1766 1767 1768 |
{ return sys_wait4(pid, stat_addr, options, NULL); } #endif |