CVE-2024-40943 (GCVE-0-2024-40943)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:25 – Updated: 2026-05-11 20:22
VLAI
Title
ocfs2: fix races between hole punching and AIO+DIO
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b25801038da5823bba1b5440a57ca68afc51b6bd , < 3c26b5d21b1239e9c7fd31ba7d9b2d7bdbaa68d9 (git)
Affected: b25801038da5823bba1b5440a57ca68afc51b6bd , < e8e2db1adac47970a6a9225f3858e9aa0e86287f (git)
Affected: b25801038da5823bba1b5440a57ca68afc51b6bd , < 050ce8af6838c71e872e982b50d3f1bec21da40e (git)
Affected: b25801038da5823bba1b5440a57ca68afc51b6bd , < 38825ff9da91d2854dcf6d9ac320a7e641e10f25 (git)
Affected: b25801038da5823bba1b5440a57ca68afc51b6bd , < ea042dc2bea19d72e37c298bf65a9c341ef3fff3 (git)
Affected: b25801038da5823bba1b5440a57ca68afc51b6bd , < 3c361f313d696df72f9bccf058510e9ec737b9b1 (git)
Affected: b25801038da5823bba1b5440a57ca68afc51b6bd , < 117b9c009b72a6c2ebfd23484354dfee2d9570d2 (git)
Affected: b25801038da5823bba1b5440a57ca68afc51b6bd , < 952b023f06a24b2ad6ba67304c4c84d45bea2f18 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.23
Unaffected: 0 , < 2.6.23 (semver)
Unaffected: 4.19.317 , ≤ 4.19.* (semver)
Unaffected: 5.4.279 , ≤ 5.4.* (semver)
Unaffected: 5.10.221 , ≤ 5.10.* (semver)
Unaffected: 5.15.162 , ≤ 5.15.* (semver)
Unaffected: 6.1.95 , ≤ 6.1.* (semver)
Unaffected: 6.6.35 , ≤ 6.6.* (semver)
Unaffected: 6.9.6 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/file.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b25801038da5823bba1b5440a57ca68afc51b6bd\",\"lessThan\":\"3c26b5d21b1239e9c7fd31ba7d9b2d7bdbaa68d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b25801038da5823bba1b5440a57ca68afc51b6bd\",\"lessThan\":\"e8e2db1adac47970a6a9225f3858e9aa0e86287f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b25801038da5823bba1b5440a57ca68afc51b6bd\",\"lessThan\":\"050ce8af6838c71e872e982b50d3f1bec21da40e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b25801038da5823bba1b5440a57ca68afc51b6bd\",\"lessThan\":\"38825ff9da91d2854dcf6d9ac320a7e641e10f25\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b25801038da5823bba1b5440a57ca68afc51b6bd\",\"lessThan\":\"ea042dc2bea19d72e37c298bf65a9c341ef3fff3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b25801038da5823bba1b5440a57ca68afc51b6bd\",\"lessThan\":\"3c361f313d696df72f9bccf058510e9ec737b9b1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b25801038da5823bba1b5440a57ca68afc51b6bd\",\"lessThan\":\"117b9c009b72a6c2ebfd23484354dfee2d9570d2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b25801038da5823bba1b5440a57ca68afc51b6bd\",\"lessThan\":\"952b023f06a24b2ad6ba67304c4c84d45bea2f18\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/file.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.23\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.23\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.317\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.279\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.221\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.162\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.95\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.35\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.9.6\",\"lessThanOrEqual\":\"6.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.10\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-09-10T17:04:20.780555Z\",\"id\":\"CVE-2024-40943\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T11:04:06+00:00",
      "cve": "CVE-2024-40943",
      "id": "CVE-2024-40943",
      "initial_release_date": "2024-07-12T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ocfs2: fix races between hole punching and AIO+DIO",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-40943.json",
      "version": "3"
    },
    "vulnrichment": {
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.317\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.279\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.221\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.162\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.95\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.35\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.6\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"2.6.23\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:18:29.194Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-40943\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T21:58:12.745Z\", \"dateReserved\": \"2024-07-12T12:17:45.588Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:25:17.813Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.