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mm/mremap: write-lock VMA while remapping it to a new address range

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Write-lock VMA as locked before copying it and when copy_vma produces a
new VMA.

Link: https://lkml.kernel.org/r/20230227173632.3292573-18-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Laurent Dufour <laurent.dufour@fr.ibm.com>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan 2023-02-27 09:36:16 -08:00 committed by Andrew Morton
parent 10fca64a66
commit d6ac235de4
2 changed files with 2 additions and 0 deletions
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1
mm/mmap.c
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@ -3197,6 +3197,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
get_file(new_vma->vm_file); get_file(new_vma->vm_file);
if (new_vma->vm_ops && new_vma->vm_ops->open) if (new_vma->vm_ops && new_vma->vm_ops->open)
new_vma->vm_ops->open(new_vma); new_vma->vm_ops->open(new_vma);
vma_start_write(new_vma);
if (vma_link(mm, new_vma)) if (vma_link(mm, new_vma))
goto out_vma_link; goto out_vma_link;
*need_rmap_locks = false; *need_rmap_locks = false;

1
mm/mremap.c
View File

@ -623,6 +623,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
return -ENOMEM; return -ENOMEM;
} }
vma_start_write(vma);
new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT); new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT);
new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff, new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff,
&need_rmap_locks); &need_rmap_locks);