| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49536: scsi: lpfc: Fix SCSI I/O completion and abort handler deadlock |
| |
| Description |
| =========== |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49536 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.15.46 with commit 7625e81de2164a082810e1f27547d388406da610 |
| Fixed in 5.17.14 with commit 21c0d469349957b5dc811c41200a2a998996ca8d |
| Fixed in 5.18.3 with commit 0c4eed901285b9cae36a622f32bea3e92490da6c |
| Fixed in 5.19 with commit 03cbbd7c2f5ee288f648f4aeedc765a181188553 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-49536 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/scsi/lpfc/lpfc_scsi.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/7625e81de2164a082810e1f27547d388406da610 |
| https://git.kernel.org/stable/c/21c0d469349957b5dc811c41200a2a998996ca8d |
| https://git.kernel.org/stable/c/0c4eed901285b9cae36a622f32bea3e92490da6c |
| https://git.kernel.org/stable/c/03cbbd7c2f5ee288f648f4aeedc765a181188553 |
