diff options
| author | Tamas Koczka <poprdi@google.com> | 2022-07-14 10:48:14 +0000 |
|---|---|---|
| committer | Luiz Augusto von Dentz <luiz.von.dentz@intel.com> | 2022-07-21 17:09:06 -0700 |
| commit | 9f30de9e0343da05ac621b5817e9b1ce303c6310 (patch) | |
| tree | a769f99f18a897b77e4b665fdf3e1a2215e00260 /net/bluetooth/hci_core.c | |
| parent | 68253f3cd715e819bc4bff2b0e6b21234e259d56 (diff) | |
Bluetooth: Collect kcov coverage from hci_rx_work
Annotate hci_rx_work() with kcov_remote_start() and kcov_remote_stop()
calls, so remote KCOV coverage is collected while processing the rx_q
queue which is the main incoming Bluetooth packet queue.
Coverage is associated with the thread which created the packet skb.
The collected extra coverage helps kernel fuzzing efforts in finding
vulnerabilities.
This change only has effect if the kernel is compiled with CONFIG_KCOV,
otherwise kcov_ functions don't do anything.
Signed-off-by: Tamas Koczka <poprdi@google.com>
Tested-by: Aleksandr Nogikh <nogikh@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Diffstat (limited to 'net/bluetooth/hci_core.c')
| -rw-r--r-- | net/bluetooth/hci_core.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 72df3425725f..d2c5f32d651b 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -29,6 +29,7 @@ #include <linux/rfkill.h> #include <linux/debugfs.h> #include <linux/crypto.h> +#include <linux/kcov.h> #include <linux/property.h> #include <linux/suspend.h> #include <linux/wait.h> @@ -3804,7 +3805,14 @@ static void hci_rx_work(struct work_struct *work) BT_DBG("%s", hdev->name); - while ((skb = skb_dequeue(&hdev->rx_q))) { + /* The kcov_remote functions used for collecting packet parsing + * coverage information from this background thread and associate + * the coverage with the syscall's thread which originally injected + * the packet. This helps fuzzing the kernel. + */ + for (; (skb = skb_dequeue(&hdev->rx_q)); kcov_remote_stop()) { + kcov_remote_start_common(skb_get_kcov_handle(skb)); + /* Send copy to monitor */ hci_send_to_monitor(hdev, skb); |