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kernel/fork: assert no VMA readers during its destruction

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Assert there are no holders of VMA lock for reading when it is about to be
destroyed.

Link: https://lkml.kernel.org/r/20230227173632.3292573-21-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan
2023-02-27 09:36:19 -08:00
committed by Andrew Morton
parent 98e51a2239
commit f2e13784c1
1 changed files with 3 additions and 0 deletions
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kernel/fork.c
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@@ -491,6 +491,9 @@ static void vm_area_free_rcu_cb(struct rcu_head *head)
{ {
struct vm_area_struct *vma = container_of(head, struct vm_area_struct, struct vm_area_struct *vma = container_of(head, struct vm_area_struct,
vm_rcu); vm_rcu);
/* The vma should not be locked while being destroyed. */
VM_BUG_ON_VMA(rwsem_is_locked(&vma->lock), vma);
__vm_area_free(vma); __vm_area_free(vma);
} }
#endif #endif