CVE-2022-49536

Summary

In the Linux kernel, the following vulnerability has been resolved:

scsi: lpfc: Fix SCSI I/O completion and abort handler deadlock

During stress I/O tests with 500+ vports, hard LOCKUP call traces are observed.

CPU A: native_queued_spin_lock_slowpath+0x192 _raw_spin_lock_irqsave+0x32 lpfc_handle_fcp_err+0x4c6 lpfc_fcp_io_cmd_wqe_cmpl+0x964 lpfc_sli4_fp_handle_cqe+0x266 __lpfc_sli4_process_cq+0x105 __lpfc_sli4_hba_process_cq+0x3c lpfc_cq_poll_hdler+0x16 irq_poll_softirq+0x76 __softirqentry_text_start+0xe4 irq_exit+0xf7 do_IRQ+0x7f

CPU B: native_queued_spin_lock_slowpath+0x5b _raw_spin_lock+0x1c lpfc_abort_handler+0x13e scmd_eh_abort_handler+0x85 process_one_work+0x1a7 worker_thread+0x30 kthread+0x112 ret_from_fork+0x1f

Diagram of lockup:

CPUA CPUB

lpfc_cmd->buf_lock phba->hbalock lpfc_cmd->buf_lock phba->hbalock

Fix by reordering the taking of the lpfc_cmd->buf_lock and phba->hbalock in lpfc_abort_handler routine so that it tries to take the lpfc_cmd->buf_lock first before phba->hbalock.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc2017260eea2db62e7bb1b7cbb1759f1d11ed067 < 7625e81de2164a082810e1f27547d388406da610affected
LinuxLinuxc2017260eea2db62e7bb1b7cbb1759f1d11ed067 < 21c0d469349957b5dc811c41200a2a998996ca8daffected
LinuxLinuxc2017260eea2db62e7bb1b7cbb1759f1d11ed067 < 0c4eed901285b9cae36a622f32bea3e92490da6caffected
LinuxLinuxc2017260eea2db62e7bb1b7cbb1759f1d11ed067 < 03cbbd7c2f5ee288f648f4aeedc765a181188553affected
LinuxLinux5.1affected
LinuxLinux0 < 5.1unaffected
LinuxLinux5.15.46 <= 5.15.*unaffected
LinuxLinux5.17.14 <= 5.17.*unaffected
LinuxLinux5.18.3 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References