cve-2021-47421
Vulnerability from cvelistv5
Published
2024-05-21 15:04
Modified
2024-11-04 12:05
Severity ?
Summary
drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dc
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu.h",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c"
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          "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."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47421",
    "datePublished": "2024-05-21T15:04:09.296Z",
    "dateReserved": "2024-05-21T14:58:30.820Z",
    "dateUpdated": "2024-11-04T12:05:35.287Z",
    "state": "PUBLISHED"
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  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47421\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:27.537\",\"lastModified\":\"2024-05-21T16:53:56.550\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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