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UPSTREAM: 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>

(cherry picked from commit f2e13784c16a98e269b3111ac02ae44446dd589c)

Bug: 161210518
Change-Id: I67fc318fd08575c9bcc54fd00b0304246b0cd279
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan 2023-02-27 09:36:19 -08:00 • committed by Carlos Llamas
parent 9cc64c7fb9
commit 3d18d86ea9
1 changed files with 3 additions and 0 deletions
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3
kernel/fork.c
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@ -498,6 +498,9 @@ 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