Commit f2e13784 authored by Suren Baghdasaryan's avatar Suren Baghdasaryan Committed by Andrew Morton
Browse files

kernel/fork: assert no VMA readers during its destruction 

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: default avatarSuren Baghdasaryan <surenb@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 98e51a22

kernel/fork.c

+3 −0
Original line number Diff line number Diff line
@@ -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,

						  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);

}

#endif