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SubjectRe: [Bluez PATCH v3] bluetooth: secure bluetooth stack from bluedump attack
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Hi Marcel,

On 12. Feb 2020, at 17.19, Marcel Holtmann <marcel@holtmann.org> wrote:
>> + key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
>> + hcon->role);
>> +
>> + /* If there already exists link key in local host, leave the
>> + * decision to user space since the remote device could be
>> + * legitimate or malicious.
>> + */
>> + if (smp->method == JUST_WORKS && key) {
>> + err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
>> + hcon->type,
>> + hcon->dst_type, passkey,
>> + 1);
>> + if (err)
>> + return SMP_UNSPECIFIED;
>> + set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
>> + }
>> }
>
> while this looks good, I like to optimize this to only look up the LTK when needed.
>
> /* comment here */
> if (smp->method != JUST_WORKS)
> goto mackey_and_ltk;
>
>
> /* and command here */
> if (hci_find_ltk()) {
> mgmt_user_confirm_request()
> ..
> }
>
> And my preference that we also get an Ack from Johan or Luiz that double checked that this is fine.

Acked-by: Johan Hedberg <johan.hedberg@intel.com>

Johan
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