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mm/mmap: write-lock VMAs in vma_prepare before modifying them

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Write-lock all VMAs which might be affected by a merge, split, expand or
shrink operations.  All these operations use vma_prepare() before making
the modifications, therefore it provides a centralized place to perform
VMA locking.

[surenb@google.com: remove unnecessary vp->vma check in vma_prepare]
  Link: https://lkml.kernel.org/r/20230301022720.1380780-1-surenb@google.com
  Link: https://lore.kernel.org/r/202302281802.J93Nma7q-lkp@intel.com/
Link: https://lkml.kernel.org/r/20230227173632.3292573-17-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Laurent Dufour <laurent.dufour@fr.ibm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan
2023-02-27 09:36:15 -08:00
committed by Andrew Morton
parent 55fd6fccad
commit 10fca64a66
1 changed files with 9 additions and 0 deletions
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9
mm/mmap.c
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@@ -502,6 +502,15 @@ static inline void init_vma_prep(struct vma_prepare *vp,
*/
static inline void vma_prepare(struct vma_prepare *vp)
{
vma_start_write(vp->vma);
if (vp->adj_next)
vma_start_write(vp->adj_next);
/* vp->insert is always a newly created VMA, no need for locking */
if (vp->remove)
vma_start_write(vp->remove);
if (vp->remove2)
vma_start_write(vp->remove2);
if (vp->file) {
uprobe_munmap(vp->vma, vp->vma->vm_start, vp->vma->vm_end);