fkie_cve-2024-40943
Vulnerability from fkie_nvd
Published
2024-07-12 13:15
Modified
2025-09-17 15:02
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix races between hole punching and AIO+DIO After commit "ocfs2: return real error code in ocfs2_dio_wr_get_block", fstests/generic/300 become from always failed to sometimes failed: ======================================================================== [ 473.293420 ] run fstests generic/300 [ 475.296983 ] JBD2: Ignoring recovery information on journal [ 475.302473 ] ocfs2: Mounting device (253,1) on (node local, slot 0) with ordered data mode. [ 494.290998 ] OCFS2: ERROR (device dm-1): ocfs2_change_extent_flag: Owner 5668 has an extent at cpos 78723 which can no longer be found [ 494.291609 ] On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted. [ 494.292018 ] OCFS2: File system is now read-only. [ 494.292224 ] (kworker/19:11,2628,19):ocfs2_mark_extent_written:5272 ERROR: status = -30 [ 494.292602 ] (kworker/19:11,2628,19):ocfs2_dio_end_io_write:2374 ERROR: status = -3 fio: io_u error on file /mnt/scratch/racer: Read-only file system: write offset=460849152, buflen=131072 ========================================================================= In __blockdev_direct_IO, ocfs2_dio_wr_get_block is called to add unwritten extents to a list. extents are also inserted into extent tree in ocfs2_write_begin_nolock. Then another thread call fallocate to puch a hole at one of the unwritten extent. The extent at cpos was removed by ocfs2_remove_extent(). At end io worker thread, ocfs2_search_extent_list found there is no such extent at the cpos. T1 T2 T3 inode lock ... insert extents ... inode unlock ocfs2_fallocate __ocfs2_change_file_space inode lock lock ip_alloc_sem ocfs2_remove_inode_range inode ocfs2_remove_btree_range ocfs2_remove_extent ^---remove the extent at cpos 78723 ... unlock ip_alloc_sem inode unlock ocfs2_dio_end_io ocfs2_dio_end_io_write lock ip_alloc_sem ocfs2_mark_extent_written ocfs2_change_extent_flag ocfs2_search_extent_list ^---failed to find extent ... unlock ip_alloc_sem In most filesystems, fallocate is not compatible with racing with AIO+DIO, so fix it by adding to wait for all dio before fallocate/punch_hole like ext4.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/050ce8af6838c71e872e982b50d3f1bec21da40ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/117b9c009b72a6c2ebfd23484354dfee2d9570d2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/38825ff9da91d2854dcf6d9ac320a7e641e10f25Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c26b5d21b1239e9c7fd31ba7d9b2d7bdbaa68d9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c361f313d696df72f9bccf058510e9ec737b9b1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/952b023f06a24b2ad6ba67304c4c84d45bea2f18Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8e2db1adac47970a6a9225f3858e9aa0e86287fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ea042dc2bea19d72e37c298bf65a9c341ef3fff3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/050ce8af6838c71e872e982b50d3f1bec21da40ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/117b9c009b72a6c2ebfd23484354dfee2d9570d2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/38825ff9da91d2854dcf6d9ac320a7e641e10f25Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3c26b5d21b1239e9c7fd31ba7d9b2d7bdbaa68d9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3c361f313d696df72f9bccf058510e9ec737b9b1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/952b023f06a24b2ad6ba67304c4c84d45bea2f18Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e8e2db1adac47970a6a9225f3858e9aa0e86287fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ea042dc2bea19d72e37c298bf65a9c341ef3fff3Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix races between hole punching and AIO+DIO\n\nAfter commit \"ocfs2: return real error code in ocfs2_dio_wr_get_block\",\nfstests/generic/300 become from always failed to sometimes failed:\n\n========================================================================\n[  473.293420 ] run fstests generic/300\n\n[  475.296983 ] JBD2: Ignoring recovery information on journal\n[  475.302473 ] ocfs2: Mounting device (253,1) on (node local, slot 0) with ordered data mode.\n[  494.290998 ] OCFS2: ERROR (device dm-1): ocfs2_change_extent_flag: Owner 5668 has an extent at cpos 78723 which can no longer be found\n[  494.291609 ] On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted.\n[  494.292018 ] OCFS2: File system is now read-only.\n[  494.292224 ] (kworker/19:11,2628,19):ocfs2_mark_extent_written:5272 ERROR: status = -30\n[  494.292602 ] (kworker/19:11,2628,19):ocfs2_dio_end_io_write:2374 ERROR: status = -3\nfio: io_u error on file /mnt/scratch/racer: Read-only file system: write offset=460849152, buflen=131072\n=========================================================================\n\nIn __blockdev_direct_IO, ocfs2_dio_wr_get_block is called to add unwritten\nextents to a list.  extents are also inserted into extent tree in\nocfs2_write_begin_nolock.  Then another thread call fallocate to puch a\nhole at one of the unwritten extent.  The extent at cpos was removed by\nocfs2_remove_extent().  At end io worker thread, ocfs2_search_extent_list\nfound there is no such extent at the cpos.\n\n    T1                        T2                T3\n                              inode lock\n                                ...\n                                insert extents\n                                ...\n                              inode unlock\nocfs2_fallocate\n __ocfs2_change_file_space\n  inode lock\n  lock ip_alloc_sem\n  ocfs2_remove_inode_range inode\n   ocfs2_remove_btree_range\n    ocfs2_remove_extent\n    ^---remove the extent at cpos 78723\n  ...\n  unlock ip_alloc_sem\n  inode unlock\n                                       ocfs2_dio_end_io\n                                        ocfs2_dio_end_io_write\n                                         lock ip_alloc_sem\n                                         ocfs2_mark_extent_written\n                                          ocfs2_change_extent_flag\n                                           ocfs2_search_extent_list\n                                           ^---failed to find extent\n                                          ...\n                                          unlock ip_alloc_sem\n\nIn most filesystems, fallocate is not compatible with racing with AIO+DIO,\nso fix it by adding to wait for all dio before fallocate/punch_hole like\next4."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ocfs2: corrige ejecuciones entre perforaci\u00f3n y AIO+DIO Despu\u00e9s de confirmar \"ocfs2: devuelve c\u00f3digo de error real en ocfs2_dio_wr_get_block\", fstests/generic/300 pasa de siempre fall\u00f3 a a veces fall\u00f3: = ==================================================== ===================== [ 473.293420 ] ejecute fstests generic/300 [ 475.296983 ] JBD2: ignorando la informaci\u00f3n de recuperaci\u00f3n en el diario [ 475.302473 ] ocfs2: Dispositivo de montaje (253,1 ) en (nodo local, ranura 0) con modo de datos ordenados. [ 494.290998 ] OCFS2: ERROR (dispositivo dm-1): ocfs2_change_extent_flag: El propietario 5668 tiene una extensi\u00f3n en cpos 78723 que ya no se puede encontrar [ 494.291609 ] Se descubri\u00f3 corrupci\u00f3n en el disco. Ejecute fsck.ocfs2 una vez que el sistema de archivos est\u00e9 desmontado. [ 494.292018 ] OCFS2: el sistema de archivos ahora es de solo lectura. [ 494.292224 ] (kworker/19:11,2628,19):ocfs2_mark_extent_write:5272 ERROR: estado = -30 [ 494.292602 ] (kworker/19:11,2628,19):ocfs2_dio_end_io_write:2374 ERROR: estado = -3 fio: Error io_u en el archivo /mnt/scratch/racer: sistema de archivos de solo lectura: escritura offset=460849152, buflen=131072 ========================== ================================================= En __blockdev_direct_IO , se llama a ocfs2_dio_wr_get_block para agregar extensiones no escritas a una lista. Las extensiones tambi\u00e9n se insertan en el \u00e1rbol de extensiones en ocfs2_write_begin_nolock. Luego, otro hilo llama a fallocate para hacer un agujero en una de las extensiones no escritas. La extensi\u00f3n en cpos fue eliminada por ocfs2_remove_extent(). Al final del hilo de trabajo de io, ocfs2_search_extent_list descubri\u00f3 que no existe tal extensi\u00f3n en los cpos. T1 T2 T3 bloqueo de inodo... insertar extensiones... desbloqueo de inodo ocfs2_fallocate __ocfs2_change_file_space bloqueo de inodo bloqueo ip_alloc_sem ocfs2_remove_inode_range inodo ocfs2_remove_btree_range ocfs2_remove_extent ^---eliminar la extensi\u00f3n en cpos 78723... desbloquear inodo ip_alloc_sem desbloquear ocfs2_dio_end_io ocfs2_dio_end_io_write bloquear ip_alloc_sem ocfs2_mark_extent_writing ocfs2_change_extent_flag ocfs2_search_extent_list ^ ---no se pudo encontrar la extensi\u00f3n... desbloquear ip_alloc_sem En la mayor\u00eda de los sistemas de archivos, fallocate no es compatible con ejecuciones con AIO+DIO, as\u00ed que solucionelo agregando esperar a que todos los dio antes de fallocate/punch_hole como ext4."
    }
  ],
  "id": "CVE-2024-40943",
  "lastModified": "2025-09-17T15:02:30.983",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  },
  "published": "2024-07-12T13:15:16.670",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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