FKIE_CVE-2021-47007

Vulnerability from fkie_nvd - Published: 2024-02-28 09:15 - Updated: 2025-01-08 17:58
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix panic during f2fs_resize_fs() f2fs_resize_fs() hangs in below callstack with testcase: - mkfs 16GB image & mount image - dd 8GB fileA - dd 8GB fileB - sync - rm fileA - sync - resize filesystem to 8GB kernel BUG at segment.c:2484! Call Trace: allocate_segment_by_default+0x92/0xf0 [f2fs] f2fs_allocate_data_block+0x44b/0x7e0 [f2fs] do_write_page+0x5a/0x110 [f2fs] f2fs_outplace_write_data+0x55/0x100 [f2fs] f2fs_do_write_data_page+0x392/0x850 [f2fs] move_data_page+0x233/0x320 [f2fs] do_garbage_collect+0x14d9/0x1660 [f2fs] free_segment_range+0x1f7/0x310 [f2fs] f2fs_resize_fs+0x118/0x330 [f2fs] __f2fs_ioctl+0x487/0x3680 [f2fs] __x64_sys_ioctl+0x8e/0xd0 do_syscall_64+0x33/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The root cause is we forgot to check that whether we have enough space in resized filesystem to store all valid blocks in before-resizing filesystem, then allocator will run out-of-space during block migration in free_segment_range().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1c20a4896409f5ca1c770e1880c33d0a28a8b10fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ab0598e6d860ef49d029943ba80f627c15c15d6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/822054e5026c43b1dd60cf387dd999e95ee2ecc2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/860afd680d9cc1dabd61cda3cd246f60aa1eb705Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1c20a4896409f5ca1c770e1880c33d0a28a8b10fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3ab0598e6d860ef49d029943ba80f627c15c15d6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/822054e5026c43b1dd60cf387dd999e95ee2ecc2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/860afd680d9cc1dabd61cda3cd246f60aa1eb705Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "48EEEAD2-D08A-422C-8830-6CCF86E89E64",
              "versionEndExcluding": "5.10.38",
              "versionStartIncluding": "5.8",
              "vulnerable": true
            },
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "83B53E9A-F426-4C03-9A5F-A931FF79827E",
              "versionEndExcluding": "5.11.22",
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              "vulnerable": true
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          "negate": false,
          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix panic during f2fs_resize_fs()\n\nf2fs_resize_fs() hangs in below callstack with testcase:\n- mkfs 16GB image \u0026 mount image\n- dd 8GB fileA\n- dd 8GB fileB\n- sync\n- rm fileA\n- sync\n- resize filesystem to 8GB\n\nkernel BUG at segment.c:2484!\nCall Trace:\n allocate_segment_by_default+0x92/0xf0 [f2fs]\n f2fs_allocate_data_block+0x44b/0x7e0 [f2fs]\n do_write_page+0x5a/0x110 [f2fs]\n f2fs_outplace_write_data+0x55/0x100 [f2fs]\n f2fs_do_write_data_page+0x392/0x850 [f2fs]\n move_data_page+0x233/0x320 [f2fs]\n do_garbage_collect+0x14d9/0x1660 [f2fs]\n free_segment_range+0x1f7/0x310 [f2fs]\n f2fs_resize_fs+0x118/0x330 [f2fs]\n __f2fs_ioctl+0x487/0x3680 [f2fs]\n __x64_sys_ioctl+0x8e/0xd0\n do_syscall_64+0x33/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nThe root cause is we forgot to check that whether we have enough space\nin resized filesystem to store all valid blocks in before-resizing\nfilesystem, then allocator will run out-of-space during block migration\nin free_segment_range()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: corrige el p\u00e1nico durante f2fs_resize_fs() f2fs_resize_fs() se bloquea en la pila de llamadas debajo con el caso de prueba: - imagen mkfs de 16 GB y montaje de imagen - dd archivo A de 8 GB - agrega archivo B de 8 GB - sincronizaci\u00f3n - archivo rm A - sincronizaci\u00f3n - cambiar el tama\u00f1o del sistema de archivos al kernel de 8 GB \u00a1ERROR en segment.c:2484! Seguimiento de llamadas: allocate_segment_by_default+0x92/0xf0 [f2fs] f2fs_allocate_data_block+0x44b/0x7e0 [f2fs] do_write_page+0x5a/0x110 [f2fs] f2fs_outplace_write_data+0x55/0x100 [f2fs] f2fs_do_write_data_page +0x392/0x850 [f2fs] mover_p\u00e1gina_datos+0x233/0x320 [f2fs] ] do_garbage_collect+0x14d9/0x1660 [f2fs] free_segment_range+0x1f7/0x310 [f2fs] f2fs_resize_fs+0x118/0x330 [f2fs] __f2fs_ioctl+0x487/0x3680 [f2fs] __x64_sys_ioct l+0x8e/0xd0 do_syscall_64+0x33/0x80 Entry_SYSCALL_64_after_hwframe+0x44/0xa9 La ra\u00edz Porque olvidamos verificar si tenemos suficiente espacio en el sistema de archivos redimensionado para almacenar todos los bloques v\u00e1lidos en el sistema de archivos antes de cambiar el tama\u00f1o, entonces el asignador se quedar\u00e1 sin espacio durante la migraci\u00f3n de bloques en free_segment_range()."
    }
  ],
  "id": "CVE-2021-47007",
  "lastModified": "2025-01-08T17:58:51.337",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-02-28T09:15:38.507",
  "references": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-754"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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