Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: annotate data-races around hdev->req_status __hci_cmd_sync_sk() sets hdev->req_status under hdev->req_lock: hdev->req_status = HCI_REQ_PEND; However, several other functions read or write hdev->req_status without holding any lock: - hci_send_cmd_sync() reads req_status in hci_cmd_work (workqueue) - hci_cmd_sync_complete() reads/writes from HCI event completion - hci_cmd_sync_cancel() / hci_cmd_sync_cancel_sync() read/write - hci_abort_conn() reads in connection abort path Since __hci_cmd_sync_sk() runs on hdev->req_workqueue while hci_send_cmd_sync() runs on hdev->workqueue, these are different workqueues that can execute concurrently on different CPUs. The plain C accesses constitute a data race. Add READ_ONCE()/WRITE_ONCE() annotations on all concurrent accesses to hdev->req_status to prevent potential compiler optimizations that could affect correctness (e.g., load fusing in the wait_event condition or store reordering).

Affected Products 8

References 4

• git.kernel.org https://git.kernel.org/stable/c/40734ce8efc34c4a0d0222855798c0dc14b65f2e
  Patch
• git.kernel.org https://git.kernel.org/stable/c/6e539907c0d11f514c5e0b049b27b04dff48a5b1
  Patch
• git.kernel.org https://git.kernel.org/stable/c/a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27
  Patch
• git.kernel.org https://git.kernel.org/stable/c/b6807cfc195ef99e1ac37b2e1e60df40295daa8c
  Patch

Remediation

• git.kernel.org https://git.kernel.org/stable/c/40734ce8efc34c4a0d0222855798c0dc14b65f2e
  Patch
• git.kernel.org https://git.kernel.org/stable/c/6e539907c0d11f514c5e0b049b27b04dff48a5b1
  Patch
• git.kernel.org https://git.kernel.org/stable/c/a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27
  Patch
• git.kernel.org https://git.kernel.org/stable/c/b6807cfc195ef99e1ac37b2e1e60df40295daa8c
  Patch