{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING\n\nXiao reported that lvm2 test lvconvert-raid-takeover.sh can hang with\nsmall possibility, the root cause is exactly the same as commit\nbed9e27baf52 (\"Revert \"md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d\"\")\n\nHowever, Dan reported another hang after that, and junxiao investigated\nthe problem and found out that this is caused by plugged bio can't issue\nfrom raid5d().\n\nCurrent implementation in raid5d() has a weird dependence:\n\n1) md_check_recovery() from raid5d() must hold 'reconfig_mutex' to clear\n   MD_SB_CHANGE_PENDING;\n2) raid5d() handles IO in a deadloop, until all IO are issued;\n3) IO from raid5d() must wait for MD_SB_CHANGE_PENDING to be cleared;\n\nThis behaviour is introduce before v2.6, and for consequence, if other\ncontext hold 'reconfig_mutex', and md_check_recovery() can't update\nsuper_block, then raid5d() will waste one cpu 100% by the deadloop, until\n'reconfig_mutex' is released.\n\nRefer to the implementation from raid1 and raid10, fix this problem by\nskipping issue IO if MD_SB_CHANGE_PENDING is still set after\nmd_check_recovery(), daemon thread will be woken up when 'reconfig_mutex'\nis released. Meanwhile, the hang problem will be fixed as well."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/md/raid5.c"
               ],
               "versions": [
                  {
                     "version": "f3d55bd5b7b9",
                     "lessThan": "b32aa95843ca",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "1c00bb624cd0",
                     "lessThan": "634ba3c97ec4",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "782b3e71c957",
                     "lessThan": "aa64464c8f4d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "9e86dffd0b02",
                     "lessThan": "098d54934814",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "5e2cf333b7bd",
                     "lessThan": "3f8d5e802d4c",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "5e2cf333b7bd",
                     "lessThan": "cd2538e5af49",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "5e2cf333b7bd",
                     "lessThan": "e332a12f65d8",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "5e2cf333b7bd",
                     "lessThan": "151f66bb618d",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/md/raid5.c"
               ],
               "versions": [
                  {
                     "version": "6.1",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "6.1",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.316",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.278",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.219",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.161",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.94",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.34",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9.5",
                     "lessThanOrEqual": "6.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.10",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/b32aa95843cac6b12c2c014d40fca18aef24a347"
            },
            {
               "url": "https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4"
            },
            {
               "url": "https://git.kernel.org/stable/c/aa64464c8f4d2ab92f6d0b959a1e0767b829d787"
            },
            {
               "url": "https://git.kernel.org/stable/c/098d54934814dd876963abfe751c3b1cf7fbe56a"
            },
            {
               "url": "https://git.kernel.org/stable/c/3f8d5e802d4cedd445f9a89be8c3fd2d0e99024b"
            },
            {
               "url": "https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447"
            },
            {
               "url": "https://git.kernel.org/stable/c/e332a12f65d8fed8cf63bedb4e9317bb872b9ac7"
            },
            {
               "url": "https://git.kernel.org/stable/c/151f66bb618d1fd0eeb84acb61b4a9fa5d8bb0fa"
            }
         ],
         "title": "md/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-39476",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}