[RFC PATCH RESEND 12/28] mm/mremap: mark VMA as locked while remapping it to a new address range
From: Suren Baghdasaryan <surenb@google.com>
Date: 2022-09-01 17:37:14
Also in:
linux-arm-kernel, linux-mm, lkml
Subsystem:
memory management, memory mapping, the rest · Maintainers:
Andrew Morton, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds
Mark VMA as locked before copying it and when copy_vma produces a new VMA. Signed-off-by: Suren Baghdasaryan <surenb@google.com> --- mm/mmap.c | 1 + mm/mremap.c | 1 + 2 files changed, 2 insertions(+)
diff --git a/mm/mmap.c b/mm/mmap.c
index ade3909c89b4..121544fd90de 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c@@ -3248,6 +3248,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, get_file(new_vma->vm_file); if (new_vma->vm_ops && new_vma->vm_ops->open) new_vma->vm_ops->open(new_vma); + vma_mark_locked(new_vma); vma_link(mm, new_vma, prev, rb_link, rb_parent); *need_rmap_locks = false; }
diff --git a/mm/mremap.c b/mm/mremap.c
index b522cd0259a0..bdbf96254e43 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c@@ -620,6 +620,7 @@ static unsigned long move_vma(struct vm_area_struct *vma, return -ENOMEM; } + vma_mark_locked(vma); new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT); new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff, &need_rmap_locks);
--
2.37.2.789.g6183377224-goog