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Revert "fork: defer linking file vma until vma is fully initialized"

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BugLink: https://bugs.launchpad.net/bugs/2074091

This reverts commit 073dd4b2ab.

Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Portia Stephens
2024-07-22 16:34:37 -04:00
committed by Roxana Nicolescu
parent c01df2aa10
commit 22cfd78a5f
1 changed files with 16 additions and 17 deletions
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kernel/fork.c
+16 -17
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@@ -717,23 +717,6 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
} else if (anon_vma_fork(tmp, mpnt))
goto fail_nomem_anon_vma_fork;
vm_flags_clear(tmp, VM_LOCKED_MASK);
/*
* Copy/update hugetlb private vma information.
*/
if (is_vm_hugetlb_page(tmp))
hugetlb_dup_vma_private(tmp);
/*
* Link the vma into the MT. After using __mt_dup(), memory
* allocation is not necessary here, so it cannot fail.
*/
vma_iter_bulk_store(&vmi, tmp);
mm->map_count++;
if (tmp->vm_ops && tmp->vm_ops->open)
tmp->vm_ops->open(tmp);
file = tmp->vm_file;
if (file) {
struct address_space *mapping = file->f_mapping;
@@ -750,9 +733,25 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
i_mmap_unlock_write(mapping);
}
/*
* Copy/update hugetlb private vma information.
*/
if (is_vm_hugetlb_page(tmp))
hugetlb_dup_vma_private(tmp);
/*
* Link the vma into the MT. After using __mt_dup(), memory
* allocation is not necessary here, so it cannot fail.
*/
vma_iter_bulk_store(&vmi, tmp);
mm->map_count++;
if (!(tmp->vm_flags & VM_WIPEONFORK))
retval = copy_page_range(tmp, mpnt);
if (tmp->vm_ops && tmp->vm_ops->open)
tmp->vm_ops->open(tmp);
if (retval) {
mpnt = vma_next(&vmi);
goto loop_out;