cvelist/2024/50xxx/CVE-2024-50022.json

{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-50022",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndevice-dax: correct pgoff align in dax_set_mapping()\n\npgoff should be aligned using ALIGN_DOWN() instead of ALIGN().  Otherwise,\nvmf->address not aligned to fault_size will be aligned to the next\nalignment, that can result in memory failure getting the wrong address.\n\nIt's a subtle situation that only can be observed in\npage_mapped_in_vma() after the page is page fault handled by\ndev_dax_huge_fault.  Generally, there is little chance to perform\npage_mapped_in_vma in dev-dax's page unless in specific error injection\nto the dax device to trigger an MCE - memory-failure.  In that case,\npage_mapped_in_vma() will be triggered to determine which task is\naccessing the failure address and kill that task in the end.\n\n\nWe used self-developed dax device (which is 2M aligned mapping) , to\nperform error injection to random address.  It turned out that error\ninjected to non-2M-aligned address was causing endless MCE until panic.\nBecause page_mapped_in_vma() kept resulting wrong address and the task\naccessing the failure address was never killed properly:\n\n\n[ 3783.719419] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3784.049006] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3784.049190] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3784.448042] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3784.448186] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3784.792026] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3784.792179] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3785.162502] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3785.162633] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3785.461116] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3785.461247] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3785.764730] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3785.764859] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3786.042128] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3786.042259] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3786.464293] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3786.464423] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3786.818090] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3786.818217] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n[ 3787.085297] mce: Uncorrected hardware memory error in user-access at \n200c9742380\n[ 3787.085424] Memory failure: 0x200c9742: recovery action for dax page: \nRecovered\n\nIt took us several weeks to pinpoint this problem,\u00a0 but we eventually\nused bpftrace to trace the page fault and mce address and successfully\nidentified the issue.\n\n\nJoao added:\n\n; Likely we never reproduce in production because we always pin\n: device-dax regions in the region align they provide (Qemu does\n: similarly with prealloc in hugetlb/file backed memory).  I think this\n: bug requires that we touch *unpinned* device-dax regions unaligned to\n: the device-dax selected alignment (page size i.e.  4K/2M/1G)"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "b9b5777f09be",
                                            "version_value": "9c4198dfdca8"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.17",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.17",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.1.113",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.6.57",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.11.4",
                                                        "lessThanOrEqual": "6.11.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.12-rc3",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/9c4198dfdca818c5ce19c764d90eabd156bbc6da",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/9c4198dfdca818c5ce19c764d90eabd156bbc6da"
            },
            {
                "url": "https://git.kernel.org/stable/c/b822007e8db341d6f175c645ed79866db501ad86",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/b822007e8db341d6f175c645ed79866db501ad86"
            },
            {
                "url": "https://git.kernel.org/stable/c/e877427d218159ac29c9326100920d24330c9ee6",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/e877427d218159ac29c9326100920d24330c9ee6"
            },
            {
                "url": "https://git.kernel.org/stable/c/7fcbd9785d4c17ea533c42f20a9083a83f301fa6",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/7fcbd9785d4c17ea533c42f20a9083a83f301fa6"
            }
        ]
    },
    "generator": {
        "engine": "bippy-c9c4e1df01b2"
    }
}