gsd-2021-47140
Vulnerability from gsd
Modified
2024-03-05 06:03
Details
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Clear DMA ops when switching domain Since commit 08a27c1c3ecf ("iommu: Add support to change default domain of an iommu group") a user can switch a device between IOMMU and direct DMA through sysfs. This doesn't work for AMD IOMMU at the moment because dev->dma_ops is not cleared when switching from a DMA to an identity IOMMU domain. The DMA layer thus attempts to use the dma-iommu ops on an identity domain, causing an oops: # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/unbind # echo identity > /sys/bus/pci/devices/0000:00:05.0/iommu_group/type # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/bind ... BUG: kernel NULL pointer dereference, address: 0000000000000028 ... Call Trace: iommu_dma_alloc e1000e_setup_tx_resources e1000e_open Since iommu_change_dev_def_domain() calls probe_finalize() again, clear the dma_ops there like Vt-d does.
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{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-47140"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Clear DMA ops when switching domain\n\nSince commit 08a27c1c3ecf (\"iommu: Add support to change default domain\nof an iommu group\") a user can switch a device between IOMMU and direct\nDMA through sysfs. This doesn\u0027t work for AMD IOMMU at the moment because\ndev-\u003edma_ops is not cleared when switching from a DMA to an identity\nIOMMU domain. The DMA layer thus attempts to use the dma-iommu ops on an\nidentity domain, causing an oops:\n\n  # echo 0000:00:05.0 \u003e /sys/sys/bus/pci/drivers/e1000e/unbind\n  # echo identity \u003e /sys/bus/pci/devices/0000:00:05.0/iommu_group/type\n  # echo 0000:00:05.0 \u003e /sys/sys/bus/pci/drivers/e1000e/bind\n   ...\n  BUG: kernel NULL pointer dereference, address: 0000000000000028\n   ...\n   Call Trace:\n    iommu_dma_alloc\n    e1000e_setup_tx_resources\n    e1000e_open\n\nSince iommu_change_dev_def_domain() calls probe_finalize() again, clear\nthe dma_ops there like Vt-d does.",
      "id": "GSD-2021-47140",
      "modified": "2024-03-05T06:03:55.161761Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2021-47140",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "08a27c1c3ecf",
                          "version_value": "f3f2cf46291a"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "status": "affected",
                                "version": "5.11"
                              },
                              {
                                "lessThan": "5.11",
                                "status": "unaffected",
                                "version": "0",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "5.12.*",
                                "status": "unaffected",
                                "version": "5.12.9",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "5.13",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Clear DMA ops when switching domain\n\nSince commit 08a27c1c3ecf (\"iommu: Add support to change default domain\nof an iommu group\") a user can switch a device between IOMMU and direct\nDMA through sysfs. This doesn\u0027t work for AMD IOMMU at the moment because\ndev-\u003edma_ops is not cleared when switching from a DMA to an identity\nIOMMU domain. The DMA layer thus attempts to use the dma-iommu ops on an\nidentity domain, causing an oops:\n\n  # echo 0000:00:05.0 \u003e /sys/sys/bus/pci/drivers/e1000e/unbind\n  # echo identity \u003e /sys/bus/pci/devices/0000:00:05.0/iommu_group/type\n  # echo 0000:00:05.0 \u003e /sys/sys/bus/pci/drivers/e1000e/bind\n   ...\n  BUG: kernel NULL pointer dereference, address: 0000000000000028\n   ...\n   Call Trace:\n    iommu_dma_alloc\n    e1000e_setup_tx_resources\n    e1000e_open\n\nSince iommu_change_dev_def_domain() calls probe_finalize() again, clear\nthe dma_ops there like Vt-d does."
          }
        ]
      },
      "generator": {
        "engine": "bippy-b4257b672505"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/f3f2cf46291a693eab21adb94171b0128c2a9ec1",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/f3f2cf46291a693eab21adb94171b0128c2a9ec1"
          },
          {
            "name": "https://git.kernel.org/stable/c/d6177a6556f853785867e2ec6d5b7f4906f0d809",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/d6177a6556f853785867e2ec6d5b7f4906f0d809"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Clear DMA ops when switching domain\n\nSince commit 08a27c1c3ecf (\"iommu: Add support to change default domain\nof an iommu group\") a user can switch a device between IOMMU and direct\nDMA through sysfs. This doesn\u0027t work for AMD IOMMU at the moment because\ndev-\u003edma_ops is not cleared when switching from a DMA to an identity\nIOMMU domain. The DMA layer thus attempts to use the dma-iommu ops on an\nidentity domain, causing an oops:\n\n  # echo 0000:00:05.0 \u003e /sys/sys/bus/pci/drivers/e1000e/unbind\n  # echo identity \u003e /sys/bus/pci/devices/0000:00:05.0/iommu_group/type\n  # echo 0000:00:05.0 \u003e /sys/sys/bus/pci/drivers/e1000e/bind\n   ...\n  BUG: kernel NULL pointer dereference, address: 0000000000000028\n   ...\n   Call Trace:\n    iommu_dma_alloc\n    e1000e_setup_tx_resources\n    e1000e_open\n\nSince iommu_change_dev_def_domain() calls probe_finalize() again, clear\nthe dma_ops there like Vt-d does."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iommu/amd: borra las operaciones de DMA al cambiar de dominio. Desde el commit 08a27c1c3ecf (\"iommu: agrega soporte para cambiar el dominio predeterminado de un grupo iommu\"), un usuario puede cambiar un dispositivo entre IOMMU y DMA directo a trav\u00e9s de sysfs. Esto no funciona para AMD IOMMU en este momento porque dev-\u0026gt;dma_ops no se borra al cambiar de un DMA a un dominio IOMMU de identidad. Por lo tanto, la capa DMA intenta utilizar las operaciones dma-iommu en un dominio de identidad, lo que provoca un error: # echo 0000:00:05.0 \u0026gt; /sys/sys/bus/pci/drivers/e1000e/unbind # echo Identity \u0026gt; /sys/ bus/pci/devices/0000:00:05.0/iommu_group/type # echo 0000:00:05.0 \u0026gt; /sys/sys/bus/pci/drivers/e1000e/bind ... ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000028 ... Seguimiento de llamadas: iommu_dma_alloc e1000e_setup_tx_resources e1000e_open Dado que iommu_change_dev_def_domain() llama a probe_finalize() nuevamente, borre dma_ops all\u00ed como lo hace Vt-d."
          }
        ],
        "id": "CVE-2021-47140",
        "lastModified": "2024-03-25T13:47:14.087",
        "metrics": {},
        "published": "2024-03-25T09:15:08.740",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d6177a6556f853785867e2ec6d5b7f4906f0d809"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f3f2cf46291a693eab21adb94171b0128c2a9ec1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}


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