cve-2024-46706
Vulnerability from cvelistv5
Published
2024-09-13 06:27
Modified
2024-12-19 09:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tty: serial: fsl_lpuart: mark last busy before uart_add_one_port With "earlycon initcall_debug=1 loglevel=8" in bootargs, kernel sometimes boot hang. It is because normal console still is not ready, but runtime suspend is called, so early console putchar will hang in waiting TRDE set in UARTSTAT. The lpuart driver has auto suspend delay set to 3000ms, but during uart_add_one_port, a child device serial ctrl will added and probed with its pm runtime enabled(see serial_ctrl.c). The runtime suspend call path is: device_add |-> bus_probe_device |->device_initial_probe |->__device_attach |-> pm_runtime_get_sync(dev->parent); |-> pm_request_idle(dev); |-> pm_runtime_put(dev->parent); So in the end, before normal console ready, the lpuart get runtime suspended. And earlycon putchar will hang. To address the issue, mark last busy just after pm_runtime_enable, three seconds is long enough to switch from bootconsole to normal console.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ecf625d4acb71d726bc0b49403cf68388b3d58dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8eb92cfca6c2c5a15ab1773f3d18ab8d8f7dbb68Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc98d76a15bc29a9a4e76f2f65f39f3e590fb15cPatch
Impacted products
Vendor Product Version
Linux Linux Version: 6.2
Show details on NVD website

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              "content": {
                "id": "CVE-2024-46706",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-29T15:02:49.399006Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: fsl_lpuart: mark last busy before uart_add_one_port\n\nWith \"earlycon initcall_debug=1 loglevel=8\" in bootargs, kernel\nsometimes boot hang. It is because normal console still is not ready,\nbut runtime suspend is called, so early console putchar will hang\nin waiting TRDE set in UARTSTAT.\n\nThe lpuart driver has auto suspend delay set to 3000ms, but during\nuart_add_one_port, a child device serial ctrl will added and probed with\nits pm runtime enabled(see serial_ctrl.c).\nThe runtime suspend call path is:\ndevice_add\n     |-\u003e bus_probe_device\n           |-\u003edevice_initial_probe\n\t           |-\u003e__device_attach\n                         |-\u003e pm_runtime_get_sync(dev-\u003eparent);\n\t\t\t |-\u003e pm_request_idle(dev);\n\t\t\t |-\u003e pm_runtime_put(dev-\u003eparent);\n\nSo in the end, before normal console ready, the lpuart get runtime\nsuspended. And earlycon putchar will hang.\n\nTo address the issue, mark last busy just after pm_runtime_enable,\nthree seconds is long enough to switch from bootconsole to normal\nconsole."
        }
      ],
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        "dateUpdated": "2024-12-19T09:21:22.835Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "tty: serial: fsl_lpuart: mark last busy before uart_add_one_port",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-46706",
    "datePublished": "2024-09-13T06:27:33.085Z",
    "dateReserved": "2024-09-11T15:12:18.252Z",
    "dateUpdated": "2024-12-19T09:21:22.835Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-46706\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-09-13T07:15:05.560\",\"lastModified\":\"2024-09-19T17:51:07.670\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntty: serial: fsl_lpuart: mark last busy before uart_add_one_port\\n\\nWith \\\"earlycon initcall_debug=1 loglevel=8\\\" in bootargs, kernel\\nsometimes boot hang. It is because normal console still is not ready,\\nbut runtime suspend is called, so early console putchar will hang\\nin waiting TRDE set in UARTSTAT.\\n\\nThe lpuart driver has auto suspend delay set to 3000ms, but during\\nuart_add_one_port, a child device serial ctrl will added and probed with\\nits pm runtime enabled(see serial_ctrl.c).\\nThe runtime suspend call path is:\\ndevice_add\\n     |-\u003e bus_probe_device\\n           |-\u003edevice_initial_probe\\n\\t           |-\u003e__device_attach\\n                         |-\u003e pm_runtime_get_sync(dev-\u003eparent);\\n\\t\\t\\t |-\u003e pm_request_idle(dev);\\n\\t\\t\\t |-\u003e pm_runtime_put(dev-\u003eparent);\\n\\nSo in the end, before normal console ready, the lpuart get runtime\\nsuspended. And earlycon putchar will hang.\\n\\nTo address the issue, mark last busy just after pm_runtime_enable,\\nthree seconds is long enough to switch from bootconsole to normal\\nconsole.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: serial: fsl_lpuart: marcar el \u00faltimo ocupado antes de uart_add_one_port Con \\\"earlycon initcall_debug=1 loglevel=8\\\" en bootargs, el kernel a veces se bloquea al iniciar. Esto se debe a que la consola normal a\u00fan no est\u00e1 lista, pero se llama a la suspensi\u00f3n en tiempo de ejecuci\u00f3n, por lo que la consola temprana putchar se bloquear\u00e1 esperando que se establezca TRDE en UARTSTAT. El controlador lpuart tiene un retraso de suspensi\u00f3n autom\u00e1tica establecido en 3000 ms, pero durante uart_add_one_port, se agregar\u00e1 un dispositivo secundario serial ctrl y se sondear\u00e1 con su tiempo de ejecuci\u00f3n pm habilitado (consulte serial_ctrl.c). La ruta de la llamada a la suspensi\u00f3n en tiempo de ejecuci\u00f3n es: device_add |-\u0026gt; bus_probe_device |-\u0026gt;device_initial_probe |-\u0026gt;__device_attach |-\u0026gt; pm_runtime_get_sync(dev-\u0026gt;parent); |-\u0026gt; pm_request_idle(dev); |-\u0026gt; pm_runtime_put(dev-\u0026gt;parent); Por lo tanto, al final, antes de que la consola normal est\u00e9 lista, el tiempo de ejecuci\u00f3n de lpuart get se suspende. Y el putchar de earlycon se bloquea. Para solucionar el problema, marque la \u00faltima vez que est\u00e1 ocupado justo despu\u00e9s de pm_runtime_enable; tres segundos son suficientes para cambiar de la consola de arranque a la consola normal.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.48\",\"matchCriteriaId\":\"9DE9201A-CE6B-4726-BABB-8265EA0F8AE4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.7\",\"matchCriteriaId\":\"D2AFDFD1-D95A-4EB7-843B-5E7659518B67\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"8B3CE743-2126-47A3-8B7C-822B502CF119\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4DEB27E7-30AA-45CC-8934-B89263EF3551\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E0005AEF-856E-47EB-BFE4-90C46899394D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3ecf625d4acb71d726bc0b49403cf68388b3d58d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8eb92cfca6c2c5a15ab1773f3d18ab8d8f7dbb68\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dc98d76a15bc29a9a4e76f2f65f39f3e590fb15c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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