CVE-2024-49958 (GCVE-0-2024-49958)
Vulnerability from cvelistv5
Published
2024-10-21 18:02
Modified
2025-11-03 22:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: reserve space for inline xattr before attaching reflink tree One of our customers reported a crash and a corrupted ocfs2 filesystem. The crash was due to the detection of corruption. Upon troubleshooting, the fsck -fn output showed the below corruption [EXTENT_LIST_FREE] Extent list in owner 33080590 claims 230 as the next free chain record, but fsck believes the largest valid value is 227. Clamp the next record value? n The stat output from the debugfs.ocfs2 showed the following corruption where the "Next Free Rec:" had overshot the "Count:" in the root metadata block. Inode: 33080590 Mode: 0640 Generation: 2619713622 (0x9c25a856) FS Generation: 904309833 (0x35e6ac49) CRC32: 00000000 ECC: 0000 Type: Regular Attr: 0x0 Flags: Valid Dynamic Features: (0x16) HasXattr InlineXattr Refcounted Extended Attributes Block: 0 Extended Attributes Inline Size: 256 User: 0 (root) Group: 0 (root) Size: 281320357888 Links: 1 Clusters: 141738 ctime: 0x66911b56 0x316edcb8 -- Fri Jul 12 06:02:30.829349048 2024 atime: 0x66911d6b 0x7f7a28d -- Fri Jul 12 06:11:23.133669517 2024 mtime: 0x66911b56 0x12ed75d7 -- Fri Jul 12 06:02:30.317552087 2024 dtime: 0x0 -- Wed Dec 31 17:00:00 1969 Refcount Block: 2777346 Last Extblk: 2886943 Orphan Slot: 0 Sub Alloc Slot: 0 Sub Alloc Bit: 14 Tree Depth: 1 Count: 227 Next Free Rec: 230 ## Offset Clusters Block# 0 0 2310 2776351 1 2310 2139 2777375 2 4449 1221 2778399 3 5670 731 2779423 4 6401 566 2780447 ....... .... ....... ....... .... ....... The issue was in the reflink workfow while reserving space for inline xattr. The problematic function is ocfs2_reflink_xattr_inline(). By the time this function is called the reflink tree is already recreated at the destination inode from the source inode. At this point, this function reserves space for inline xattrs at the destination inode without even checking if there is space at the root metadata block. It simply reduces the l_count from 243 to 227 thereby making space of 256 bytes for inline xattr whereas the inode already has extents beyond this index (in this case up to 230), thereby causing corruption. The fix for this is to reserve space for inline metadata at the destination inode before the reflink tree gets recreated. The customer has verified the fix.
References
Impacted products
Vendor Product Version
Linux Linux Version: ef962df057aaafd714f5c22ba3de1be459571fdf
Version: ef962df057aaafd714f5c22ba3de1be459571fdf
Version: ef962df057aaafd714f5c22ba3de1be459571fdf
Version: ef962df057aaafd714f5c22ba3de1be459571fdf
Version: ef962df057aaafd714f5c22ba3de1be459571fdf
Version: ef962df057aaafd714f5c22ba3de1be459571fdf
Version: ef962df057aaafd714f5c22ba3de1be459571fdf
Version: ef962df057aaafd714f5c22ba3de1be459571fdf
Version: ef962df057aaafd714f5c22ba3de1be459571fdf
Version: 3a32958d2ac96070c53d04bd8e013c97b260b5e6
Version: 93f26306db89c9dc37885b76a1082e6d54d23b16
Version: 26a849f49fb3347d126a0ed6611173f903374ef4
Version: 1e7e4c9ae2a78a6791a2ca91a6a400f94855f01e
Version: 1926bf8ae44d80c9f50103f11fc4f17e2e2bf684
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reserve space for inline xattr before attaching reflink tree\n\nOne of our customers reported a crash and a corrupted ocfs2 filesystem. \nThe crash was due to the detection of corruption.  Upon troubleshooting,\nthe fsck -fn output showed the below corruption\n\n[EXTENT_LIST_FREE] Extent list in owner 33080590 claims 230 as the next free chain record,\nbut fsck believes the largest valid value is 227.  Clamp the next record value? n\n\nThe stat output from the debugfs.ocfs2 showed the following corruption\nwhere the \"Next Free Rec:\" had overshot the \"Count:\" in the root metadata\nblock.\n\n        Inode: 33080590   Mode: 0640   Generation: 2619713622 (0x9c25a856)\n        FS Generation: 904309833 (0x35e6ac49)\n        CRC32: 00000000   ECC: 0000\n        Type: Regular   Attr: 0x0   Flags: Valid\n        Dynamic Features: (0x16) HasXattr InlineXattr Refcounted\n        Extended Attributes Block: 0  Extended Attributes Inline Size: 256\n        User: 0 (root)   Group: 0 (root)   Size: 281320357888\n        Links: 1   Clusters: 141738\n        ctime: 0x66911b56 0x316edcb8 -- Fri Jul 12 06:02:30.829349048 2024\n        atime: 0x66911d6b 0x7f7a28d -- Fri Jul 12 06:11:23.133669517 2024\n        mtime: 0x66911b56 0x12ed75d7 -- Fri Jul 12 06:02:30.317552087 2024\n        dtime: 0x0 -- Wed Dec 31 17:00:00 1969\n        Refcount Block: 2777346\n        Last Extblk: 2886943   Orphan Slot: 0\n        Sub Alloc Slot: 0   Sub Alloc Bit: 14\n        Tree Depth: 1   Count: 227   Next Free Rec: 230\n        ## Offset        Clusters       Block#\n        0  0             2310           2776351\n        1  2310          2139           2777375\n        2  4449          1221           2778399\n        3  5670          731            2779423\n        4  6401          566            2780447\n        .......          ....           .......\n        .......          ....           .......\n\nThe issue was in the reflink workfow while reserving space for inline\nxattr.  The problematic function is ocfs2_reflink_xattr_inline().  By the\ntime this function is called the reflink tree is already recreated at the\ndestination inode from the source inode.  At this point, this function\nreserves space for inline xattrs at the destination inode without even\nchecking if there is space at the root metadata block.  It simply reduces\nthe l_count from 243 to 227 thereby making space of 256 bytes for inline\nxattr whereas the inode already has extents beyond this index (in this\ncase up to 230), thereby causing corruption.\n\nThe fix for this is to reserve space for inline metadata at the destination\ninode before the reflink tree gets recreated. The customer has verified the\nfix."
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\"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef962df057aaafd714f5c22ba3de1be459571fdf\", \"lessThan\": \"637c00e06564a945e9d0edb3d78d362d64935f9f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef962df057aaafd714f5c22ba3de1be459571fdf\", \"lessThan\": \"9f9a8f3ac65b4147f1a7b6c05fad5192c0e3c3d9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef962df057aaafd714f5c22ba3de1be459571fdf\", \"lessThan\": \"96ce4c3537114d1698be635f5e36c62dc49df7a4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef962df057aaafd714f5c22ba3de1be459571fdf\", \"lessThan\": \"5ca60b86f57a4d9648f68418a725b3a7de2816b0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3a32958d2ac96070c53d04bd8e013c97b260b5e6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"93f26306db89c9dc37885b76a1082e6d54d23b16\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"26a849f49fb3347d126a0ed6611173f903374ef4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1e7e4c9ae2a78a6791a2ca91a6a400f94855f01e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1926bf8ae44d80c9f50103f11fc4f17e2e2bf684\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ocfs2/refcounttree.c\", \"fs/ocfs2/xattr.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.323\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.285\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.55\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ocfs2/refcounttree.c\", \"fs/ocfs2/xattr.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5c9807c523b4fca81d3e8e864dabc8c806402121\"}, {\"url\": \"https://git.kernel.org/stable/c/74364cb578dcc0b6c9109519d19cbe5a56afac9a\"}, {\"url\": \"https://git.kernel.org/stable/c/aac31d654a0a31cb0d2fa36ae694f4e164a52707\"}, {\"url\": \"https://git.kernel.org/stable/c/020f5c53c17f66c0a8f2d37dad27ace301b8d8a1\"}, {\"url\": \"https://git.kernel.org/stable/c/5c2072f02c0d75802ec28ec703b7d43a0dd008b5\"}, {\"url\": \"https://git.kernel.org/stable/c/637c00e06564a945e9d0edb3d78d362d64935f9f\"}, {\"url\": \"https://git.kernel.org/stable/c/9f9a8f3ac65b4147f1a7b6c05fad5192c0e3c3d9\"}, {\"url\": \"https://git.kernel.org/stable/c/96ce4c3537114d1698be635f5e36c62dc49df7a4\"}, {\"url\": \"https://git.kernel.org/stable/c/5ca60b86f57a4d9648f68418a725b3a7de2816b0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: reserve space for inline xattr before attaching reflink tree\\n\\nOne of our customers reported a crash and a corrupted ocfs2 filesystem. \\nThe crash was due to the detection of corruption.  Upon troubleshooting,\\nthe fsck -fn output showed the below corruption\\n\\n[EXTENT_LIST_FREE] Extent list in owner 33080590 claims 230 as the next free chain record,\\nbut fsck believes the largest valid value is 227.  Clamp the next record value? n\\n\\nThe stat output from the debugfs.ocfs2 showed the following corruption\\nwhere the \\\"Next Free Rec:\\\" had overshot the \\\"Count:\\\" in the root metadata\\nblock.\\n\\n        Inode: 33080590   Mode: 0640   Generation: 2619713622 (0x9c25a856)\\n        FS Generation: 904309833 (0x35e6ac49)\\n        CRC32: 00000000   ECC: 0000\\n        Type: Regular   Attr: 0x0   Flags: Valid\\n        Dynamic Features: (0x16) HasXattr InlineXattr Refcounted\\n        Extended Attributes Block: 0  Extended Attributes Inline Size: 256\\n        User: 0 (root)   Group: 0 (root)   Size: 281320357888\\n        Links: 1   Clusters: 141738\\n        ctime: 0x66911b56 0x316edcb8 -- Fri Jul 12 06:02:30.829349048 2024\\n        atime: 0x66911d6b 0x7f7a28d -- Fri Jul 12 06:11:23.133669517 2024\\n        mtime: 0x66911b56 0x12ed75d7 -- Fri Jul 12 06:02:30.317552087 2024\\n        dtime: 0x0 -- Wed Dec 31 17:00:00 1969\\n        Refcount Block: 2777346\\n        Last Extblk: 2886943   Orphan Slot: 0\\n        Sub Alloc Slot: 0   Sub Alloc Bit: 14\\n        Tree Depth: 1   Count: 227   Next Free Rec: 230\\n        ## Offset        Clusters       Block#\\n        0  0             2310           2776351\\n        1  2310          2139           2777375\\n        2  4449          1221           2778399\\n        3  5670          731            2779423\\n        4  6401          566            2780447\\n        .......          ....           .......\\n        .......          ....           .......\\n\\nThe issue was in the reflink workfow while reserving space for inline\\nxattr.  The problematic function is ocfs2_reflink_xattr_inline().  By the\\ntime this function is called the reflink tree is already recreated at the\\ndestination inode from the source inode.  At this point, this function\\nreserves space for inline xattrs at the destination inode without even\\nchecking if there is space at the root metadata block.  It simply reduces\\nthe l_count from 243 to 227 thereby making space of 256 bytes for inline\\nxattr whereas the inode already has extents beyond this index (in this\\ncase up to 230), thereby causing corruption.\\n\\nThe fix for this is to reserve space for inline metadata at the destination\\ninode before the reflink tree gets recreated. The customer has verified the\\nfix.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.323\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.285\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.0.87\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.2.49\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.4.54\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.9.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.10.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:59:13.995Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49958\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:23:38.186Z\", \"dateReserved\": \"2024-10-21T12:17:06.048Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:02:11.702Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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