diff mbox series

[v7,06/17] mm/nommu: fix the last places where vma is not locked before being attached

Message ID 20241226170710.1159679-7-surenb@google.com (mailing list archive)
State New
Headers show
Series move per-vma lock into vm_area_struct | expand

Commit Message

Suren Baghdasaryan Dec. 26, 2024, 5:06 p.m. UTC 
nommu configuration has two places where vma gets attached to the vma tree
without write-locking it. Add the missing locks to ensure vma is always
locked before it's attached.

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
 mm/nommu.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/mm/nommu.c b/mm/nommu.c
index 72c8c505836c..1754e84e5758 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1189,6 +1189,7 @@  unsigned long do_mmap(struct file *file,
 		goto error_just_free;
 
 	setup_vma_to_mm(vma, current->mm);
+	vma_start_write(vma);
 	current->mm->map_count++;
 	/* add the VMA to the tree */
 	vma_iter_store(&vmi, vma, true);
@@ -1356,6 +1357,7 @@  static int split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
 
 	setup_vma_to_mm(vma, mm);
 	setup_vma_to_mm(new, mm);
+	vma_start_write(new);
 	vma_iter_store(vmi, new, true);
 	mm->map_count++;
 	return 0;