fkie_cve-2021-47421
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-09-25 16:09
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume In current code, when a PCI error state pci_channel_io_normal is detectd, it will report PCI_ERS_RESULT_CAN_RECOVER status to PCI driver, and PCI driver will continue the execution of PCI resume callback report_resume by pci_walk_bridge, and the callback will go into amdgpu_pci_resume finally, where write lock is releasd unconditionally without acquiring such lock first. In this case, a deadlock will happen when other threads start to acquire the read lock. To fix this, add a member in amdgpu_device strucutre to cache pci_channel_state, and only continue the execution in amdgpu_pci_resume when it's pci_channel_io_frozen.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/785cc093b6b5a93cc350421a55f3f1eda6585156Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dcPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume\n\nIn current code, when a PCI error state pci_channel_io_normal is detectd,\nit will report PCI_ERS_RESULT_CAN_RECOVER status to PCI driver, and PCI\ndriver will continue the execution of PCI resume callback report_resume by\npci_walk_bridge, and the callback will go into amdgpu_pci_resume\nfinally, where write lock is releasd unconditionally without acquiring\nsuch lock first. In this case, a deadlock will happen when other threads\nstart to acquire the read lock.\n\nTo fix this, add a member in amdgpu_device strucutre to cache\npci_channel_state, and only continue the execution in amdgpu_pci_resume\nwhen it\u0027s pci_channel_io_frozen."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amdgpu: maneja el caso de pci_channel_io_frozen solo en amdgpu_pci_resume. En el c\u00f3digo actual, cuando se detecta un estado de error de PCI pci_channel_io_normal, informar\u00e1 el estado de PCI_ERS_RESULT_CAN_RECOVER al controlador PCI, y el controlador PCI contin\u00fae la ejecuci\u00f3n de PCI resume callback report_resume mediante pci_walk_bridge, y la devoluci\u00f3n de llamada finalmente ir\u00e1 a amdgpu_pci_resume, donde el bloqueo de escritura se libera incondicionalmente sin adquirir dicho bloqueo primero. En este caso, se producir\u00e1 un punto muerto cuando otros subprocesos comiencen a adquirir el bloqueo de lectura. Para solucionar este problema, agregue un miembro en la estructura amdgpu_device para almacenar en cach\u00e9 pci_channel_state y solo contin\u00fae la ejecuci\u00f3n en amdgpu_pci_resume cuando sea pci_channel_io_frozen."
    }
  ],
  "id": "CVE-2021-47421",
  "lastModified": "2025-09-25T16:09:09.850",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2024-05-21T15:15:27.537",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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