CVE-2024-35807 (GCVE-0-2024-35807)

Vulnerability from cvelistv5 – Published: 2024-05-17 13:23 – Updated: 2025-05-04 09:05
VLAI?
Title
ext4: fix corruption during on-line resize
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix corruption during on-line resize We observed a corruption during on-line resize of a file system that is larger than 16 TiB with 4k block size. With having more then 2^32 blocks resize_inode is turned off by default by mke2fs. The issue can be reproduced on a smaller file system for convenience by explicitly turning off resize_inode. An on-line resize across an 8 GiB boundary (the size of a meta block group in this setup) then leads to a corruption: dev=/dev/<some_dev> # should be >= 16 GiB mkdir -p /corruption /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15)) mount -t ext4 $dev /corruption dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15)) sha1sum /corruption/test # 79d2658b39dcfd77274e435b0934028adafaab11 /corruption/test /sbin/resize2fs $dev $((2*2**21)) # drop page cache to force reload the block from disk echo 1 > /proc/sys/vm/drop_caches sha1sum /corruption/test # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3 /corruption/test 2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per block group and 2^6 are the number of block groups that make a meta block group. The last checksum might be different depending on how the file is laid out across the physical blocks. The actual corruption occurs at physical block 63*2^15 = 2064384 which would be the location of the backup of the meta block group's block descriptor. During the on-line resize the file system will be converted to meta_bg starting at s_first_meta_bg which is 2 in the example - meaning all block groups after 16 GiB. However, in ext4_flex_group_add we might add block groups that are not part of the first meta block group yet. In the reproducer we achieved this by substracting the size of a whole block group from the point where the meta block group would start. This must be considered when updating the backup block group descriptors to follow the non-meta_bg layout. The fix is to add a test whether the group to add is already part of the meta block group or not.
Severity ?
No CVSS data available.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 , < 75cc31c2e7193b69f5d25650bda5bb42ed92f8a1 (git)
Affected: 01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 , < ee4e9c1976147a850f6085a13fca95bcaa00d84c (git)
Affected: 01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 , < e8e8b197317228b5089ed9e7802dadf3ccaa027a (git)
Affected: 01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 , < 239c669edb2bffa1aa2612519b1d438ab35d6be6 (git)
Affected: 01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 , < fb1088d51bbaa0faec5a55d4f5818a9ab79e24df (git)
Affected: 01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 , < 37b6a3ba793bbbae057f5b991970ebcc52cb3db5 (git)
Affected: 01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 , < b461910af8ba3bed80f48c2bf852686d05c6fc5c (git)
Affected: 01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 , < 722d2c01b8b108f8283d1b7222209d5b2a5aa7bd (git)
Affected: 01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 , < a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc (git)
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    Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 4.19.312 , ≤ 4.19.* (semver)
Unaffected: 5.4.274 , ≤ 5.4.* (semver)
Unaffected: 5.10.215 , ≤ 5.10.* (semver)
Unaffected: 5.15.154 , ≤ 5.15.* (semver)
Unaffected: 6.1.84 , ≤ 6.1.* (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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\"239c669edb2bffa1aa2612519b1d438ab35d6be6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\", \"lessThan\": \"fb1088d51bbaa0faec5a55d4f5818a9ab79e24df\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\", \"lessThan\": \"37b6a3ba793bbbae057f5b991970ebcc52cb3db5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\", \"lessThan\": \"b461910af8ba3bed80f48c2bf852686d05c6fc5c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\", \"lessThan\": \"722d2c01b8b108f8283d1b7222209d5b2a5aa7bd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"01f795f9e0d67adeccc61a8b20c28acb45fa5fd8\", \"lessThan\": \"a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ext4/resize.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.312\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.274\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.215\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.154\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/resize.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/75cc31c2e7193b69f5d25650bda5bb42ed92f8a1\"}, {\"url\": \"https://git.kernel.org/stable/c/ee4e9c1976147a850f6085a13fca95bcaa00d84c\"}, {\"url\": \"https://git.kernel.org/stable/c/e8e8b197317228b5089ed9e7802dadf3ccaa027a\"}, {\"url\": \"https://git.kernel.org/stable/c/239c669edb2bffa1aa2612519b1d438ab35d6be6\"}, {\"url\": \"https://git.kernel.org/stable/c/fb1088d51bbaa0faec5a55d4f5818a9ab79e24df\"}, {\"url\": \"https://git.kernel.org/stable/c/37b6a3ba793bbbae057f5b991970ebcc52cb3db5\"}, {\"url\": \"https://git.kernel.org/stable/c/b461910af8ba3bed80f48c2bf852686d05c6fc5c\"}, {\"url\": \"https://git.kernel.org/stable/c/722d2c01b8b108f8283d1b7222209d5b2a5aa7bd\"}, {\"url\": \"https://git.kernel.org/stable/c/a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix corruption during on-line resize\\n\\nWe observed a corruption during on-line resize of a file system that is\\nlarger than 16 TiB with 4k block size. With having more then 2^32 blocks\\nresize_inode is turned off by default by mke2fs. The issue can be\\nreproduced on a smaller file system for convenience by explicitly\\nturning off resize_inode. An on-line resize across an 8 GiB boundary (the\\nsize of a meta block group in this setup) then leads to a corruption:\\n\\n  dev=/dev/\u003csome_dev\u003e # should be \u003e= 16 GiB\\n  mkdir -p /corruption\\n  /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15))\\n  mount -t ext4 $dev /corruption\\n\\n  dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15))\\n  sha1sum /corruption/test\\n  # 79d2658b39dcfd77274e435b0934028adafaab11  /corruption/test\\n\\n  /sbin/resize2fs $dev $((2*2**21))\\n  # drop page cache to force reload the block from disk\\n  echo 1 \u003e /proc/sys/vm/drop_caches\\n\\n  sha1sum /corruption/test\\n  # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3  /corruption/test\\n\\n2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per\\nblock group and 2^6 are the number of block groups that make a meta\\nblock group.\\n\\nThe last checksum might be different depending on how the file is laid\\nout across the physical blocks. The actual corruption occurs at physical\\nblock 63*2^15 = 2064384 which would be the location of the backup of the\\nmeta block group\u0027s block descriptor. During the on-line resize the file\\nsystem will be converted to meta_bg starting at s_first_meta_bg which is\\n2 in the example - meaning all block groups after 16 GiB. However, in\\next4_flex_group_add we might add block groups that are not part of the\\nfirst meta block group yet. In the reproducer we achieved this by\\nsubstracting the size of a whole block group from the point where the\\nmeta block group would start. This must be considered when updating the\\nbackup block group descriptors to follow the non-meta_bg layout. The fix\\nis to add a test whether the group to add is already part of the meta\\nblock group or not.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.312\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.274\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.215\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.154\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.84\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.24\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.12\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.3\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"3.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:05:50.120Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35807\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:05:50.120Z\", \"dateReserved\": \"2024-05-17T12:19:12.342Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T13:23:14.869Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.


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