CVE-2024-42305 (GCVE-0-2024-42305)

Vulnerability from cvelistv5 – Published: 2024-08-17 09:09 – Updated: 2025-11-03 22:04
VLAI?
Title
ext4: check dot and dotdot of dx_root before making dir indexed
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: check dot and dotdot of dx_root before making dir indexed Syzbot reports a issue as follows: ============================================ BUG: unable to handle page fault for address: ffffed11022e24fe PGD 23ffee067 P4D 23ffee067 PUD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 PID: 5079 Comm: syz-executor306 Not tainted 6.10.0-rc5-g55027e689933 #0 Call Trace: <TASK> make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341 ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451 ext4_rename fs/ext4/namei.c:3936 [inline] ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214 [...] ============================================ The immediate cause of this problem is that there is only one valid dentry for the block to be split during do_split, so split==0 results in out of bounds accesses to the map triggering the issue. do_split unsigned split dx_make_map count = 1 split = count/2 = 0; continued = hash2 == map[split - 1].hash; ---> map[4294967295] The maximum length of a filename is 255 and the minimum block size is 1024, so it is always guaranteed that the number of entries is greater than or equal to 2 when do_split() is called. But syzbot's crafted image has no dot and dotdot in dir, and the dentry distribution in dirblock is as follows: bus dentry1 hole dentry2 free |xx--|xx-------------|...............|xx-------------|...............| 0 12 (8+248)=256 268 256 524 (8+256)=264 788 236 1024 So when renaming dentry1 increases its name_len length by 1, neither hole nor free is sufficient to hold the new dentry, and make_indexed_dir() is called. In make_indexed_dir() it is assumed that the first two entries of the dirblock must be dot and dotdot, so bus and dentry1 are left in dx_root because they are treated as dot and dotdot, and only dentry2 is moved to the new leaf block. That's why count is equal to 1. Therefore add the ext4_check_dx_root() helper function to add more sanity checks to dot and dotdot before starting the conversion to avoid the above issue.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 19e13b4d7f0303186fcc891aba8d0de7c8fdbda8 (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 42d420517072028fb0eb852c358056b7717ba5aa (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 8afe06ed3be7a874b3cd82ef5f8959aca8d6429a (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < abb411ac991810c0bcbe51c2e76d2502bf611b5c (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 9d241b7a39af192d1bb422714a458982c7cc67a2 (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < cdd345321699042ece4a9d2e70754d2397d378c5 (git)
Affected: ac27a0ec112a089f1a5102bc8dffc79c8c815571 , < 50ea741def587a64e08879ce6c6a30131f7111e7 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.19
Unaffected: 0 , < 2.6.19 (semver)
Unaffected: 4.19.320 , ≤ 4.19.* (semver)
Unaffected: 5.4.282 , ≤ 5.4.* (semver)
Unaffected: 5.10.224 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.103 , ≤ 6.1.* (semver)
Unaffected: 6.6.44 , ≤ 6.6.* (semver)
Unaffected: 6.10.3 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: check dot and dotdot of dx_root before making dir indexed\n\nSyzbot reports a issue as follows:\n============================================\nBUG: unable to handle page fault for address: ffffed11022e24fe\nPGD 23ffee067 P4D 23ffee067 PUD 0\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 0 PID: 5079 Comm: syz-executor306 Not tainted 6.10.0-rc5-g55027e689933 #0\nCall Trace:\n \u003cTASK\u003e\n make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341\n ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451\n ext4_rename fs/ext4/namei.c:3936 [inline]\n ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214\n[...]\n============================================\n\nThe immediate cause of this problem is that there is only one valid dentry\nfor the block to be split during do_split, so split==0 results in out of\nbounds accesses to the map triggering the issue.\n\n    do_split\n      unsigned split\n      dx_make_map\n       count = 1\n      split = count/2 = 0;\n      continued = hash2 == map[split - 1].hash;\n       ---\u003e map[4294967295]\n\nThe maximum length of a filename is 255 and the minimum block size is 1024,\nso it is always guaranteed that the number of entries is greater than or\nequal to 2 when do_split() is called.\n\nBut syzbot\u0027s crafted image has no dot and dotdot in dir, and the dentry\ndistribution in dirblock is as follows:\n\n  bus     dentry1          hole           dentry2           free\n|xx--|xx-------------|...............|xx-------------|...............|\n0   12 (8+248)=256  268     256     524 (8+256)=264 788     236     1024\n\nSo when renaming dentry1 increases its name_len length by 1, neither hole\nnor free is sufficient to hold the new dentry, and make_indexed_dir() is\ncalled.\n\nIn make_indexed_dir() it is assumed that the first two entries of the\ndirblock must be dot and dotdot, so bus and dentry1 are left in dx_root\nbecause they are treated as dot and dotdot, and only dentry2 is moved\nto the new leaf block. That\u0027s why count is equal to 1.\n\nTherefore add the ext4_check_dx_root() helper function to add more sanity\nchecks to dot and dotdot before starting the conversion to avoid the above\nissue."
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ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451\\n ext4_rename fs/ext4/namei.c:3936 [inline]\\n ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214\\n[...]\\n============================================\\n\\nThe immediate cause of this problem is that there is only one valid dentry\\nfor the block to be split during do_split, so split==0 results in out of\\nbounds accesses to the map triggering the issue.\\n\\n    do_split\\n      unsigned split\\n      dx_make_map\\n       count = 1\\n      split = count/2 = 0;\\n      continued = hash2 == map[split - 1].hash;\\n       ---\u003e map[4294967295]\\n\\nThe maximum length of a filename is 255 and the minimum block size is 1024,\\nso it is always guaranteed that the number of entries is greater than or\\nequal to 2 when do_split() is called.\\n\\nBut syzbot\u0027s crafted image has no dot and dotdot in dir, and the dentry\\ndistribution in dirblock is as follows:\\n\\n  bus     dentry1          hole           dentry2           free\\n|xx--|xx-------------|...............|xx-------------|...............|\\n0   12 (8+248)=256  268     256     524 (8+256)=264 788     236     1024\\n\\nSo when renaming dentry1 increases its name_len length by 1, neither hole\\nnor free is sufficient to hold the new dentry, and make_indexed_dir() is\\ncalled.\\n\\nIn make_indexed_dir() it is assumed that the first two entries of the\\ndirblock must be dot and dotdot, so bus and dentry1 are left in dx_root\\nbecause they are treated as dot and dotdot, and only dentry2 is moved\\nto the new leaf block. That\u0027s why count is equal to 1.\\n\\nTherefore add the ext4_check_dx_root() helper function to add more sanity\\nchecks to dot and dotdot before starting the conversion to avoid the above\\nissue.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.320\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.282\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.224\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.165\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.103\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.44\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.3\", \"versionStartIncluding\": \"2.6.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"2.6.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:26:23.871Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-42305\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:26:23.871Z\", \"dateReserved\": \"2024-07-30T07:40:12.273Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-17T09:09:11.296Z\", \"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.