CVE-2022-49297 (GCVE-0-2022-49297)
Vulnerability from cvelistv5
Published
2025-02-26 02:01
Modified
2025-05-04 08:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: fix io hung while disconnecting device In our tests, "qemu-nbd" triggers a io hung: INFO: task qemu-nbd:11445 blocked for more than 368 seconds. Not tainted 5.18.0-rc3-next-20220422-00003-g2176915513ca #884 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:qemu-nbd state:D stack: 0 pid:11445 ppid: 1 flags:0x00000000 Call Trace: <TASK> __schedule+0x480/0x1050 ? _raw_spin_lock_irqsave+0x3e/0xb0 schedule+0x9c/0x1b0 blk_mq_freeze_queue_wait+0x9d/0xf0 ? ipi_rseq+0x70/0x70 blk_mq_freeze_queue+0x2b/0x40 nbd_add_socket+0x6b/0x270 [nbd] nbd_ioctl+0x383/0x510 [nbd] blkdev_ioctl+0x18e/0x3e0 __x64_sys_ioctl+0xac/0x120 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fd8ff706577 RSP: 002b:00007fd8fcdfebf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000040000000 RCX: 00007fd8ff706577 RDX: 000000000000000d RSI: 000000000000ab00 RDI: 000000000000000f RBP: 000000000000000f R08: 000000000000fbe8 R09: 000055fe497c62b0 R10: 00000002aff20000 R11: 0000000000000246 R12: 000000000000006d R13: 0000000000000000 R14: 00007ffe82dc5e70 R15: 00007fd8fcdff9c0 "qemu-ndb -d" will call ioctl 'NBD_DISCONNECT' first, however, following message was found: block nbd0: Send disconnect failed -32 Which indicate that something is wrong with the server. Then, "qemu-nbd -d" will call ioctl 'NBD_CLEAR_SOCK', however ioctl can't clear requests after commit 2516ab1543fd("nbd: only clear the queue on device teardown"). And in the meantime, request can't complete through timeout because nbd_xmit_timeout() will always return 'BLK_EH_RESET_TIMER', which means such request will never be completed in this situation. Now that the flag 'NBD_CMD_INFLIGHT' can make sure requests won't complete multiple times, switch back to call nbd_clear_sock() in nbd_clear_sock_ioctl(), so that inflight requests can be cleared.
References
https://git.kernel.org/stable/c/67e403136a0e1a55fef6a05f103a3979a39ad3fd
https://git.kernel.org/stable/c/62d227f67a8c25d5e16f40e5290607f9306d2188
https://git.kernel.org/stable/c/69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd
https://git.kernel.org/stable/c/f72df77600a43e59b3189e53b47f8685739867d3
https://git.kernel.org/stable/c/c4ba982bd5084fa659ef518aaf159e4dab02ecda
https://git.kernel.org/stable/c/54b06dc2a206b4d67349bb56b92d4bd32700b7b1
https://git.kernel.org/stable/c/141318e62db87105b0103fccc59c9c5940da248d
https://git.kernel.org/stable/c/09dadb5985023e27d4740ebd17e6fea4640110e5
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix io hung while disconnecting device\n\nIn our tests, \"qemu-nbd\" triggers a io hung:\n\nINFO: task qemu-nbd:11445 blocked for more than 368 seconds.\n      Not tainted 5.18.0-rc3-next-20220422-00003-g2176915513ca #884\n\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:qemu-nbd        state:D stack:    0 pid:11445 ppid:     1 flags:0x00000000\nCall Trace:\n \u003cTASK\u003e\n __schedule+0x480/0x1050\n ? _raw_spin_lock_irqsave+0x3e/0xb0\n schedule+0x9c/0x1b0\n blk_mq_freeze_queue_wait+0x9d/0xf0\n ? ipi_rseq+0x70/0x70\n blk_mq_freeze_queue+0x2b/0x40\n nbd_add_socket+0x6b/0x270 [nbd]\n nbd_ioctl+0x383/0x510 [nbd]\n blkdev_ioctl+0x18e/0x3e0\n __x64_sys_ioctl+0xac/0x120\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7fd8ff706577\nRSP: 002b:00007fd8fcdfebf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 0000000040000000 RCX: 00007fd8ff706577\nRDX: 000000000000000d RSI: 000000000000ab00 RDI: 000000000000000f\nRBP: 000000000000000f R08: 000000000000fbe8 R09: 000055fe497c62b0\nR10: 00000002aff20000 R11: 0000000000000246 R12: 000000000000006d\nR13: 0000000000000000 R14: 00007ffe82dc5e70 R15: 00007fd8fcdff9c0\n\n\"qemu-ndb -d\" will call ioctl \u0027NBD_DISCONNECT\u0027 first, however, following\nmessage was found:\n\nblock nbd0: Send disconnect failed -32\n\nWhich indicate that something is wrong with the server. Then,\n\"qemu-nbd -d\" will call ioctl \u0027NBD_CLEAR_SOCK\u0027, however ioctl can\u0027t clear\nrequests after commit 2516ab1543fd(\"nbd: only clear the queue on device\nteardown\"). And in the meantime, request can\u0027t complete through timeout\nbecause nbd_xmit_timeout() will always return \u0027BLK_EH_RESET_TIMER\u0027, which\nmeans such request will never be completed in this situation.\n\nNow that the flag \u0027NBD_CMD_INFLIGHT\u0027 can make sure requests won\u0027t\ncomplete multiple times, switch back to call nbd_clear_sock() in\nnbd_clear_sock_ioctl(), so that inflight requests can be cleared."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:34:34.627Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/67e403136a0e1a55fef6a05f103a3979a39ad3fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/62d227f67a8c25d5e16f40e5290607f9306d2188"
        },
        {
          "url": "https://git.kernel.org/stable/c/69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/f72df77600a43e59b3189e53b47f8685739867d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4ba982bd5084fa659ef518aaf159e4dab02ecda"
        },
        {
          "url": "https://git.kernel.org/stable/c/54b06dc2a206b4d67349bb56b92d4bd32700b7b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/141318e62db87105b0103fccc59c9c5940da248d"
        },
        {
          "url": "https://git.kernel.org/stable/c/09dadb5985023e27d4740ebd17e6fea4640110e5"
        }
      ],
      "title": "nbd: fix io hung while disconnecting device",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49297",
    "datePublished": "2025-02-26T02:01:26.628Z",
    "dateReserved": "2025-02-26T01:49:39.302Z",
    "dateUpdated": "2025-05-04T08:34:34.627Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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