[PW_SID:1125861] Bluetooth: hci_core: add lockdep check to hci_conn lookups#425
[PW_SID:1125861] Bluetooth: hci_core: add lockdep check to hci_conn lookups#425BluezTestBot wants to merge 1 commit into
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Add lockdep check for RCU || hdev->lock in hci_conn_hash lookups that return hci_conn pointer, as dereferencing that without locks can be TOCTOU issue. It used to be several callsites did not hold appropriate locks. The check is equivalent to removing rcu_read_lock() and doing instead list_for_each_entry_rcu(c, &h->list, list, lockdep_is_held(&hdev->lock)) Although there should not be any remaining callsites without locks, don't remove the rcu_read_lock() for now, and just add the warning here. Signed-off-by: Pauli Virtanen <pav@iki.fi>
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2 participants
Add lockdep check for RCU || hdev->lock in hci_conn_hash lookups that
return hci_conn pointer, as dereferencing that without locks can be
TOCTOU issue. It used to be several callsites did not hold appropriate
locks.
The check is equivalent to removing rcu_read_lock() and doing instead
list_for_each_entry_rcu(c, &h->list, list, lockdep_is_held(&hdev->lock))
Although there should not be any remaining callsites without locks,
don't remove the rcu_read_lock() for now, and just add the warning here.
Signed-off-by: Pauli Virtanen pav@iki.fi
Notes:
The patch series recently merged in bluetooth-next/master added the
locks at remaining callsites, so we should be able to turn this on.
include/net/bluetooth/hci_core.h | 44 ++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)