CVE-2021-47114 (GCVE-0-2021-47114)

Vulnerability from cvelistv5 – Published: 2024-03-15 20:14 – Updated: 2025-12-18 11:35
VLAI?
Title
ocfs2: fix data corruption by fallocate
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix data corruption by fallocate When fallocate punches holes out of inode size, if original isize is in the middle of last cluster, then the part from isize to the end of the cluster will be zeroed with buffer write, at that time isize is not yet updated to match the new size, if writeback is kicked in, it will invoke ocfs2_writepage()->block_write_full_page() where the pages out of inode size will be dropped. That will cause file corruption. Fix this by zero out eof blocks when extending the inode size. Running the following command with qemu-image 4.2.1 can get a corrupted coverted image file easily. qemu-img convert -p -t none -T none -f qcow2 $qcow_image \ -O qcow2 -o compat=1.1 $qcow_image.conv The usage of fallocate in qemu is like this, it first punches holes out of inode size, then extend the inode size. fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0 fallocate(11, 0, 2276196352, 65536) = 0 v1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html v2: https://lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 385820a38d5e7c70b20af4d68767b1920b1e4133 , < 624fa7baa3788dc9e57840ba5b94bc22b03cda57 (git)
Affected: 385820a38d5e7c70b20af4d68767b1920b1e4133 , < 33e03adafb29eedae1bae9cdb50c1385279fcf65 (git)
Affected: 385820a38d5e7c70b20af4d68767b1920b1e4133 , < a1700479524bb9cb5e8ae720236a6fabd003acae (git)
Affected: 385820a38d5e7c70b20af4d68767b1920b1e4133 , < cec4e857ffaa8c447f51cd8ab4e72350077b6770 (git)
Affected: 385820a38d5e7c70b20af4d68767b1920b1e4133 , < cc2edb99ea606a45182b5ea38cc8f4e583aa0774 (git)
Affected: 385820a38d5e7c70b20af4d68767b1920b1e4133 , < c8d5faee46242c3f33b8a71a4d7d52214785bfcc (git)
Affected: 385820a38d5e7c70b20af4d68767b1920b1e4133 , < 0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b (git)
Affected: 385820a38d5e7c70b20af4d68767b1920b1e4133 , < 6bba4471f0cc1296fe3c2089b9e52442d3074b2e (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.23
Unaffected: 0 , < 2.6.23 (semver)
Unaffected: 4.4.272 , ≤ 4.4.* (semver)
Unaffected: 4.9.272 , ≤ 4.9.* (semver)
Unaffected: 4.14.236 , ≤ 4.14.* (semver)
Unaffected: 4.19.194 , ≤ 4.19.* (semver)
Unaffected: 5.4.125 , ≤ 5.4.* (semver)
Unaffected: 5.10.43 , ≤ 5.10.* (semver)
Unaffected: 5.12.10 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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\"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ocfs2/file.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57\"}, {\"url\": \"https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65\"}, {\"url\": \"https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae\"}, {\"url\": \"https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770\"}, {\"url\": \"https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774\"}, {\"url\": \"https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc\"}, {\"url\": \"https://git.kernel.org/stable/c/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b\"}, {\"url\": \"https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: fix data corruption by fallocate\\n\\nWhen fallocate punches holes out of inode size, if original isize is in\\nthe middle of last cluster, then the part from isize to the end of the\\ncluster will be zeroed with buffer write, at that time isize is not yet\\nupdated to match the new size, if writeback is kicked in, it will invoke\\nocfs2_writepage()-\u003eblock_write_full_page() where the pages out of inode\\nsize will be dropped.  That will cause file corruption.  Fix this by\\nzero out eof blocks when extending the inode size.\\n\\nRunning the following command with qemu-image 4.2.1 can get a corrupted\\ncoverted image file easily.\\n\\n    qemu-img convert -p -t none -T none -f qcow2 $qcow_image \\\\\\n             -O qcow2 -o compat=1.1 $qcow_image.conv\\n\\nThe usage of fallocate in qemu is like this, it first punches holes out\\nof inode size, then extend the inode size.\\n\\n    fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0\\n    fallocate(11, 0, 2276196352, 65536) = 0\\n\\nv1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html\\nv2: https://lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.272\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.272\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.236\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.194\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.125\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.43\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.10\", \"versionStartIncluding\": \"2.6.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"2.6.23\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-18T11:35:38.730Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47114\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-18T11:35:38.730Z\", \"dateReserved\": \"2024-03-04T18:12:48.836Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-15T20:14:22.035Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

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.