exec.c (38713c6028a3172c4c256512c3fbcfc799fe2d43) exec.c (bd74fdaea146029e4fa12c6de89adbe0779348a9)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/exec.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 */
7
8/*

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60#include <linux/fsnotify.h>
61#include <linux/fs_struct.h>
62#include <linux/oom.h>
63#include <linux/compat.h>
64#include <linux/vmalloc.h>
65#include <linux/io_uring.h>
66#include <linux/syscall_user_dispatch.h>
67#include <linux/coredump.h>
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/exec.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 */
7
8/*

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60#include <linux/fsnotify.h>
61#include <linux/fs_struct.h>
62#include <linux/oom.h>
63#include <linux/compat.h>
64#include <linux/vmalloc.h>
65#include <linux/io_uring.h>
66#include <linux/syscall_user_dispatch.h>
67#include <linux/coredump.h>
68#include <linux/time_namespace.h>
68
69#include <linux/uaccess.h>
70#include <asm/mmu_context.h>
71#include <asm/tlb.h>
72
73#include <trace/events/task.h>
74#include "internal.h"
75

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973 * Maps the mm_struct mm into the current task struct.
974 * On success, this function returns with exec_update_lock
975 * held for writing.
976 */
977static int exec_mmap(struct mm_struct *mm)
978{
979 struct task_struct *tsk;
980 struct mm_struct *old_mm, *active_mm;
69
70#include <linux/uaccess.h>
71#include <asm/mmu_context.h>
72#include <asm/tlb.h>
73
74#include <trace/events/task.h>
75#include "internal.h"
76

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974 * Maps the mm_struct mm into the current task struct.
975 * On success, this function returns with exec_update_lock
976 * held for writing.
977 */
978static int exec_mmap(struct mm_struct *mm)
979{
980 struct task_struct *tsk;
981 struct mm_struct *old_mm, *active_mm;
982 bool vfork;
981 int ret;
982
983 /* Notify parent that we're no longer interested in the old VM */
984 tsk = current;
983 int ret;
984
985 /* Notify parent that we're no longer interested in the old VM */
986 tsk = current;
987 vfork = !!tsk->vfork_done;
985 old_mm = current->mm;
986 exec_mm_release(tsk, old_mm);
987 if (old_mm)
988 sync_mm_rss(old_mm);
989
990 ret = down_write_killable(&tsk->signal->exec_update_lock);
991 if (ret)
992 return ret;

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1006
1007 task_lock(tsk);
1008 membarrier_exec_mmap(mm);
1009
1010 local_irq_disable();
1011 active_mm = tsk->active_mm;
1012 tsk->active_mm = mm;
1013 tsk->mm = mm;
988 old_mm = current->mm;
989 exec_mm_release(tsk, old_mm);
990 if (old_mm)
991 sync_mm_rss(old_mm);
992
993 ret = down_write_killable(&tsk->signal->exec_update_lock);
994 if (ret)
995 return ret;

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1009
1010 task_lock(tsk);
1011 membarrier_exec_mmap(mm);
1012
1013 local_irq_disable();
1014 active_mm = tsk->active_mm;
1015 tsk->active_mm = mm;
1016 tsk->mm = mm;
1017 lru_gen_add_mm(mm);
1014 /*
1015 * This prevents preemption while active_mm is being loaded and
1016 * it and mm are being updated, which could cause problems for
1017 * lazy tlb mm refcounting when these are updated by context
1018 * switches. Not all architectures can handle irqs off over
1019 * activate_mm yet.
1020 */
1021 if (!IS_ENABLED(CONFIG_ARCH_WANT_IRQS_OFF_ACTIVATE_MM))
1022 local_irq_enable();
1023 activate_mm(active_mm, mm);
1024 if (IS_ENABLED(CONFIG_ARCH_WANT_IRQS_OFF_ACTIVATE_MM))
1025 local_irq_enable();
1026 tsk->mm->vmacache_seqnum = 0;
1027 vmacache_flush(tsk);
1028 task_unlock(tsk);
1018 /*
1019 * This prevents preemption while active_mm is being loaded and
1020 * it and mm are being updated, which could cause problems for
1021 * lazy tlb mm refcounting when these are updated by context
1022 * switches. Not all architectures can handle irqs off over
1023 * activate_mm yet.
1024 */
1025 if (!IS_ENABLED(CONFIG_ARCH_WANT_IRQS_OFF_ACTIVATE_MM))
1026 local_irq_enable();
1027 activate_mm(active_mm, mm);
1028 if (IS_ENABLED(CONFIG_ARCH_WANT_IRQS_OFF_ACTIVATE_MM))
1029 local_irq_enable();
1030 tsk->mm->vmacache_seqnum = 0;
1031 vmacache_flush(tsk);
1032 task_unlock(tsk);
1033 lru_gen_use_mm(mm);
1034
1035 if (vfork)
1036 timens_on_fork(tsk->nsproxy, tsk);
1037
1029 if (old_mm) {
1030 mmap_read_unlock(old_mm);
1031 BUG_ON(active_mm != old_mm);
1032 setmax_mm_hiwater_rss(&tsk->signal->maxrss, old_mm);
1033 mm_update_next_owner(old_mm);
1034 mmput(old_mm);
1035 return 0;
1036 }

--- 1122 unchanged lines hidden --- 		1038 if (old_mm) {
1039 mmap_read_unlock(old_mm);
1040 BUG_ON(active_mm != old_mm);
1041 setmax_mm_hiwater_rss(&tsk->signal->maxrss, old_mm);
1042 mm_update_next_owner(old_mm);
1043 mmput(old_mm);
1044 return 0;
1045 }

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