cve-2024-50191
Vulnerability from cvelistv5
Published
2024-11-08 05:43
Modified
2024-12-19 09:35
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: don't set SB_RDONLY after filesystem errors When the filesystem is mounted with errors=remount-ro, we were setting SB_RDONLY flag to stop all filesystem modifications. We knew this misses proper locking (sb->s_umount) and does not go through proper filesystem remount procedure but it has been the way this worked since early ext2 days and it was good enough for catastrophic situation damage mitigation. Recently, syzbot has found a way (see link) to trigger warnings in filesystem freezing because the code got confused by SB_RDONLY changing under its hands. Since these days we set EXT4_FLAGS_SHUTDOWN on the superblock which is enough to stop all filesystem modifications, modifying SB_RDONLY shouldn't be needed. So stop doing that.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4061e07f040a091f694f461b86a26cf95ae66439Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/58c0648e4c773f5b54f0cb63bc8c7c6bf52719a9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3476f3dad4ad68ae5f6b008ea6591d1520da5d8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ee77c388469116565e009eaa704a60bc78489e09Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fbb177bc1d6487cd3e9b50ae0be2781b7297980dPatch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "5.15.168",
              "versionType": "semver"
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            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: don\u0027t set SB_RDONLY after filesystem errors\n\nWhen the filesystem is mounted with errors=remount-ro, we were setting\nSB_RDONLY flag to stop all filesystem modifications. We knew this misses\nproper locking (sb-\u003es_umount) and does not go through proper filesystem\nremount procedure but it has been the way this worked since early ext2\ndays and it was good enough for catastrophic situation damage\nmitigation. Recently, syzbot has found a way (see link) to trigger\nwarnings in filesystem freezing because the code got confused by\nSB_RDONLY changing under its hands. Since these days we set\nEXT4_FLAGS_SHUTDOWN on the superblock which is enough to stop all\nfilesystem modifications, modifying SB_RDONLY shouldn\u0027t be needed. So\nstop doing that."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:35:08.687Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fbb177bc1d6487cd3e9b50ae0be2781b7297980d"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d3476f3dad4ad68ae5f6b008ea6591d1520da5d8"
        }
      ],
      "title": "ext4: don\u0027t set SB_RDONLY after filesystem errors",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50191",
    "datePublished": "2024-11-08T05:43:47.840Z",
    "dateReserved": "2024-10-21T19:36:19.967Z",
    "dateUpdated": "2024-12-19T09:35:08.687Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50191\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-11-08T06:15:16.027\",\"lastModified\":\"2024-12-11T15:36:27.330\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: don\u0027t set SB_RDONLY after filesystem errors\\n\\nWhen the filesystem is mounted with errors=remount-ro, we were setting\\nSB_RDONLY flag to stop all filesystem modifications. We knew this misses\\nproper locking (sb-\u003es_umount) and does not go through proper filesystem\\nremount procedure but it has been the way this worked since early ext2\\ndays and it was good enough for catastrophic situation damage\\nmitigation. Recently, syzbot has found a way (see link) to trigger\\nwarnings in filesystem freezing because the code got confused by\\nSB_RDONLY changing under its hands. Since these days we set\\nEXT4_FLAGS_SHUTDOWN on the superblock which is enough to stop all\\nfilesystem modifications, modifying SB_RDONLY shouldn\u0027t be needed. So\\nstop doing that.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: no establecer SB_RDONLY despu\u00e9s de errores del sistema de archivos Cuando el sistema de archivos se monta con errors=remount-ro, est\u00e1bamos estableciendo el indicador SB_RDONLY para detener todas las modificaciones del sistema de archivos. Sab\u00edamos que esto omite el bloqueo adecuado (sb-\u0026gt;s_umount) y no pasa por el procedimiento de remontaje del sistema de archivos adecuado, pero ha sido la forma en que funcion\u00f3 desde los primeros d\u00edas de ext2 y fue lo suficientemente bueno para la mitigaci\u00f3n de da\u00f1os en situaciones catastr\u00f3ficas. Recientemente, syzbot encontr\u00f3 una forma (ver enlace) de activar advertencias en el congelamiento del sistema de archivos porque el c\u00f3digo se confundi\u00f3 con SB_RDONLY cambiando bajo sus manos. Desde estos d\u00edas establecemos EXT4_FLAGS_SHUTDOWN en el superbloque, lo cual es suficiente para detener todas las modificaciones del sistema de archivos, no deber\u00eda ser necesario modificar SB_RDONLY. As\u00ed que deje de hacer eso.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"F032D82B-5582-4DF5-B921-BFE0BD301364\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.57\",\"matchCriteriaId\":\"05D83DB8-7465-4F88-AFB2-980011992AC1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.4\",\"matchCriteriaId\":\"AA84D336-CE9A-4535-B901-1AD77EC17C34\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4061e07f040a091f694f461b86a26cf95ae66439\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/58c0648e4c773f5b54f0cb63bc8c7c6bf52719a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d3476f3dad4ad68ae5f6b008ea6591d1520da5d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ee77c388469116565e009eaa704a60bc78489e09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fbb177bc1d6487cd3e9b50ae0be2781b7297980d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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