fork.c (015f1e4297ad32f83251f3f4cee2389ce5516e9e) fork.c (c415c3b47ea2754659d915cca387a20999044163)
1/*
2 * linux/kernel/fork.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * 'fork.c' contains the help-routines for the 'fork' system call

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61#include <linux/blkdev.h>
62#include <linux/fs_struct.h>
63#include <linux/magic.h>
64#include <linux/perf_event.h>
65#include <linux/posix-timers.h>
66#include <linux/user-return-notifier.h>
67#include <linux/oom.h>
68#include <linux/khugepaged.h>
1/*
2 * linux/kernel/fork.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * 'fork.c' contains the help-routines for the 'fork' system call

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61#include <linux/blkdev.h>
62#include <linux/fs_struct.h>
63#include <linux/magic.h>
64#include <linux/perf_event.h>
65#include <linux/posix-timers.h>
66#include <linux/user-return-notifier.h>
67#include <linux/oom.h>
68#include <linux/khugepaged.h>
69#include <linux/signalfd.h>
69
70#include <asm/pgtable.h>
71#include <asm/pgalloc.h>
72#include <asm/uaccess.h>
73#include <asm/mmu_context.h>
74#include <asm/cacheflush.h>
75#include <asm/tlbflush.h>
76

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662 mmput(mm);
663 mm = ERR_PTR(-EACCES);
664 }
665 mutex_unlock(&task->signal->cred_guard_mutex);
666
667 return mm;
668}
669
70
71#include <asm/pgtable.h>
72#include <asm/pgalloc.h>
73#include <asm/uaccess.h>
74#include <asm/mmu_context.h>
75#include <asm/cacheflush.h>
76#include <asm/tlbflush.h>
77

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663 mmput(mm);
664 mm = ERR_PTR(-EACCES);
665 }
666 mutex_unlock(&task->signal->cred_guard_mutex);
667
668 return mm;
669}
670
671void complete_vfork_done(struct task_struct *tsk)
672{
673 struct completion *vfork_done = tsk->vfork_done;
674
675 tsk->vfork_done = NULL;
676 complete(vfork_done);
677}
678
670/* Please note the differences between mmput and mm_release.
671 * mmput is called whenever we stop holding onto a mm_struct,
672 * error success whatever.
673 *
674 * mm_release is called after a mm_struct has been removed
675 * from the current process.
676 *
677 * This difference is important for error handling, when we
678 * only half set up a mm_struct for a new process and need to restore
679 * the old one. Because we mmput the new mm_struct before
680 * restoring the old one. . .
681 * Eric Biederman 10 January 1998
682 */
683void mm_release(struct task_struct *tsk, struct mm_struct *mm)
684{
679/* Please note the differences between mmput and mm_release.
680 * mmput is called whenever we stop holding onto a mm_struct,
681 * error success whatever.
682 *
683 * mm_release is called after a mm_struct has been removed
684 * from the current process.
685 *
686 * This difference is important for error handling, when we
687 * only half set up a mm_struct for a new process and need to restore
688 * the old one. Because we mmput the new mm_struct before
689 * restoring the old one. . .
690 * Eric Biederman 10 January 1998
691 */
692void mm_release(struct task_struct *tsk, struct mm_struct *mm)
693{
685 struct completion *vfork_done = tsk->vfork_done;
686
687 /* Get rid of any futexes when releasing the mm */
688#ifdef CONFIG_FUTEX
689 if (unlikely(tsk->robust_list)) {
690 exit_robust_list(tsk);
691 tsk->robust_list = NULL;
692 }
693#ifdef CONFIG_COMPAT
694 if (unlikely(tsk->compat_robust_list)) {
695 compat_exit_robust_list(tsk);
696 tsk->compat_robust_list = NULL;
697 }
698#endif
699 if (unlikely(!list_empty(&tsk->pi_state_list)))
700 exit_pi_state_list(tsk);
701#endif
702
703 /* Get rid of any cached register state */
704 deactivate_mm(tsk, mm);
705
694 /* Get rid of any futexes when releasing the mm */
695#ifdef CONFIG_FUTEX
696 if (unlikely(tsk->robust_list)) {
697 exit_robust_list(tsk);
698 tsk->robust_list = NULL;
699 }
700#ifdef CONFIG_COMPAT
701 if (unlikely(tsk->compat_robust_list)) {
702 compat_exit_robust_list(tsk);
703 tsk->compat_robust_list = NULL;
704 }
705#endif
706 if (unlikely(!list_empty(&tsk->pi_state_list)))
707 exit_pi_state_list(tsk);
708#endif
709
710 /* Get rid of any cached register state */
711 deactivate_mm(tsk, mm);
712
706 /* notify parent sleeping on vfork() */
707 if (vfork_done) {
708 tsk->vfork_done = NULL;
709 complete(vfork_done);
710 }
713 if (tsk->vfork_done)
714 complete_vfork_done(tsk);
711
712 /*
713 * If we're exiting normally, clear a user-space tid field if
714 * requested. We leave this alone when dying by signal, to leave
715 * the value intact in a core dump, and to save the unnecessary
716 * trouble otherwise. Userland only wants this done for a sys_exit.
717 */
718 if (tsk->clear_child_tid) {

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930 return -ENOMEM;
931 atomic_set(&sig->count, 1);
932 memcpy(sig->action, current->sighand->action, sizeof(sig->action));
933 return 0;
934}
935
936void __cleanup_sighand(struct sighand_struct *sighand)
937{
715
716 /*
717 * If we're exiting normally, clear a user-space tid field if
718 * requested. We leave this alone when dying by signal, to leave
719 * the value intact in a core dump, and to save the unnecessary
720 * trouble otherwise. Userland only wants this done for a sys_exit.
721 */
722 if (tsk->clear_child_tid) {

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934 return -ENOMEM;
935 atomic_set(&sig->count, 1);
936 memcpy(sig->action, current->sighand->action, sizeof(sig->action));
937 return 0;
938}
939
940void __cleanup_sighand(struct sighand_struct *sighand)
941{
938 if (atomic_dec_and_test(&sighand->count))
942 if (atomic_dec_and_test(&sighand->count)) {
943 signalfd_cleanup(sighand);
939 kmem_cache_free(sighand_cachep, sighand);
944 kmem_cache_free(sighand_cachep, sighand);
945 }
940}
941
942
943/*
944 * Initialize POSIX timer handling for a thread group.
945 */
946static void posix_cpu_timers_init_group(struct signal_struct *sig)
947{

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947
948
949/*
950 * Initialize POSIX timer handling for a thread group.
951 */
952static void posix_cpu_timers_init_group(struct signal_struct *sig)
953{

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