executor: fix "wrong response packet" in BT fuzzing (#3493)

Problem: the BT initialization logic (`initialize_vhci()` in `common_linux.h`)
expected `HCI_VENDOR_PKT` to be sent first, but this is not always the case as
the kernel sends these two packets almost at the same time (both are sent as
the result of the `open("/dev/vhci", …)` call):
 * syscall thread: `HCI_VENDOR_PKT` (in `__vhci_create_device`)
 * `power_on` queue thread: `HCI_OP_RESET` (from `hci_reset_sync` <-
      `hci_init1_sync` <- `hci_init_sync` <- `hci_dev_open_sync` <-
      `hci_dev_do_open` <- `hci_power_on` <- `hdev->power_on` <- (worker queue)
       <- `hci_register_dev` <- `__vhci_create_device`)

Solution: handle both `HCI_OP_RESET` and `HCI_VENDOR_PKT` packets in
`initialize_vhci`.

Also instead of waiting for the kernel to send `HCI_VENDOR_PKT` after 1 second,
we initiate the setup by sending `HCI_VENDOR_PKT` (request) to the kernel first.

0 files changed, 0 insertions, 0 deletions