CVE-2021-47007 (GCVE-0-2021-47007)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2025-05-04 07:02
VLAI?
Title
f2fs: fix panic during f2fs_resize_fs()
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().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b4b10061ef98c583bcf82a4200703fbaa98c18dc , < 1c20a4896409f5ca1c770e1880c33d0a28a8b10f (git)
Affected: b4b10061ef98c583bcf82a4200703fbaa98c18dc , < 860afd680d9cc1dabd61cda3cd246f60aa1eb705 (git)
Affected: b4b10061ef98c583bcf82a4200703fbaa98c18dc , < 822054e5026c43b1dd60cf387dd999e95ee2ecc2 (git)
Affected: b4b10061ef98c583bcf82a4200703fbaa98c18dc , < 3ab0598e6d860ef49d029943ba80f627c15c15d6 (git)
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    Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.38 , ≤ 5.10.* (semver)
Unaffected: 5.11.22 , ≤ 5.11.* (semver)
Unaffected: 5.12.5 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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\"version\": \"b4b10061ef98c583bcf82a4200703fbaa98c18dc\", \"lessThan\": \"3ab0598e6d860ef49d029943ba80f627c15c15d6\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/f2fs/gc.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.38\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.22\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/f2fs/gc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1c20a4896409f5ca1c770e1880c33d0a28a8b10f\"}, {\"url\": \"https://git.kernel.org/stable/c/860afd680d9cc1dabd61cda3cd246f60aa1eb705\"}, {\"url\": \"https://git.kernel.org/stable/c/822054e5026c43b1dd60cf387dd999e95ee2ecc2\"}, {\"url\": \"https://git.kernel.org/stable/c/3ab0598e6d860ef49d029943ba80f627c15c15d6\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.38\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.22\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.5\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:02:11.875Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47007\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:02:11.875Z\", \"dateReserved\": \"2024-02-27T18:42:55.952Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-28T08:13:27.159Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • 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.