cve-2024-49870
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2024-12-19 09:27
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cachefiles: fix dentry leak in cachefiles_open_file() A dentry leak may be caused when a lookup cookie and a cull are concurrent: P1 | P2 ----------------------------------------------------------- cachefiles_lookup_cookie cachefiles_look_up_object lookup_one_positive_unlocked // get dentry cachefiles_cull inode->i_flags |= S_KERNEL_FILE; cachefiles_open_file cachefiles_mark_inode_in_use __cachefiles_mark_inode_in_use can_use = false if (!(inode->i_flags & S_KERNEL_FILE)) can_use = true return false return false // Returns an error but doesn't put dentry After that the following WARNING will be triggered when the backend folder is umounted: ================================================================== BUG: Dentry 000000008ad87947{i=7a,n=Dx_1_1.img} still in use (1) [unmount of ext4 sda] WARNING: CPU: 4 PID: 359261 at fs/dcache.c:1767 umount_check+0x5d/0x70 CPU: 4 PID: 359261 Comm: umount Not tainted 6.6.0-dirty #25 RIP: 0010:umount_check+0x5d/0x70 Call Trace: <TASK> d_walk+0xda/0x2b0 do_one_tree+0x20/0x40 shrink_dcache_for_umount+0x2c/0x90 generic_shutdown_super+0x20/0x160 kill_block_super+0x1a/0x40 ext4_kill_sb+0x22/0x40 deactivate_locked_super+0x35/0x80 cleanup_mnt+0x104/0x160 ================================================================== Whether cachefiles_open_file() returns true or false, the reference count obtained by lookup_positive_unlocked() in cachefiles_look_up_object() should be released. Therefore release that reference count in cachefiles_look_up_object() to fix the above issue and simplify the code.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7fa2382f97421978514a419c93054eca69f5247bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7d10fa7d7691558ff967668494672415f5fa151Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d32ff64c872d7e08e893c32ba6a2374583444410Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da6ef2dffe6056aad3435e6cf7c6471c2a62187cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e4a28489b310339b2b8187bec0a437709be551c1Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1f08c925e7a38002bde509e66f6f891468848511
Version: 1f08c925e7a38002bde509e66f6f891468848511
Version: 1f08c925e7a38002bde509e66f6f891468848511
Version: 1f08c925e7a38002bde509e66f6f891468848511
Version: 1f08c925e7a38002bde509e66f6f891468848511
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   Linux Linux Version: 5.17
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                "id": "CVE-2024-49870",
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    "datePublished": "2024-10-21T18:01:12.048Z",
    "dateReserved": "2024-10-21T12:17:06.019Z",
    "dateUpdated": "2024-12-19T09:27:57.281Z",
    "state": "PUBLISHED"
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Una p\u00e9rdida de dentry puede producirse cuando una cookie de b\u00fasqueda y un cull son concurrentes: P1 | P2 ----------------------------------------------------------- cachefiles_lookup_cookie cachefiles_look_up_object lookup_one_positive_unlocked // obtener dentry cachefiles_cull inode-\u0026gt;i_flags |= S_KERNEL_FILE; cachefiles_open_file cachefiles_mark_inode_in_use __cachefiles_mark_inode_in_use can_use = false if (!(inode-\u0026gt;i_flags \u0026amp; S_KERNEL_FILE)) can_use = true return false return false // Devuelve un error pero no coloca dentry Despu\u00e9s de eso, se activar\u00e1 la siguiente ADVERTENCIA cuando se desmonte la carpeta del backend: ===================================================================== ERROR: Dentry 000000008ad87947{i=7a,n=Dx_1_1.img} todav\u00eda en uso (1) [desmontaje de ext4 sda] ADVERTENCIA: CPU: 4 PID: 359261 en fs/dcache.c:1767 umount_check+0x5d/0x70 CPU: 4 PID: 359261 Comm: umount No contaminado 6.6.0-dirty #25 RIP: 0010:umount_check+0x5d/0x70 Rastreo de llamadas:  d_walk+0xda/0x2b0 do_one_tree+0x20/0x40 shrink_dcache_for_umount+0x2c/0x90 generic_shutdown_super+0x20/0x160 kill_block_super+0x1a/0x40 ext4_kill_sb+0x22/0x40 deactivate_locked_super+0x35/0x80 cleanup_mnt+0x104/0x160 ==================================================================== Independientemente de si cachefiles_open_file() devuelve verdadero o falso, el recuento de referencias obtenido por lookup_positive_unlocked() en cachefiles_look_up_object() debe liberarse. Por lo tanto, libere ese recuento de referencias en cachefiles_look_up_object() para solucionar el problema anterior y simplificar el c\u00f3digo.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"09358D68-A717-469E-B900-8002A642E29A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.55\",\"matchCriteriaId\":\"E90B9576-56C4-47BC-AAB0-C5B2D438F5D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.14\",\"matchCriteriaId\":\"4C16BCE0-FFA0-4599-BE0A-1FD65101C021\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.3\",\"matchCriteriaId\":\"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7fa2382f97421978514a419c93054eca69f5247b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c7d10fa7d7691558ff967668494672415f5fa151\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d32ff64c872d7e08e893c32ba6a2374583444410\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/da6ef2dffe6056aad3435e6cf7c6471c2a62187c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e4a28489b310339b2b8187bec0a437709be551c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
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\"https://git.kernel.org/stable/c/e4a28489b310339b2b8187bec0a437709be551c1\"}, {\"url\": \"https://git.kernel.org/stable/c/7fa2382f97421978514a419c93054eca69f5247b\"}, {\"url\": \"https://git.kernel.org/stable/c/da6ef2dffe6056aad3435e6cf7c6471c2a62187c\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncachefiles: fix dentry leak in cachefiles_open_file()\\n\\nA dentry leak may be caused when a lookup cookie and a cull are concurrent:\\n\\n            P1             |             P2\\n-----------------------------------------------------------\\ncachefiles_lookup_cookie\\n  cachefiles_look_up_object\\n    lookup_one_positive_unlocked\\n     // get dentry\\n                            cachefiles_cull\\n                              inode-\u003ei_flags |= S_KERNEL_FILE;\\n    cachefiles_open_file\\n      cachefiles_mark_inode_in_use\\n        __cachefiles_mark_inode_in_use\\n          can_use = false\\n          if (!(inode-\u003ei_flags \u0026 S_KERNEL_FILE))\\n            can_use = true\\n\\t  return false\\n        return false\\n        // Returns an error but doesn\u0027t put dentry\\n\\nAfter that the following WARNING will be triggered when the backend folder\\nis umounted:\\n\\n==================================================================\\nBUG: Dentry 000000008ad87947{i=7a,n=Dx_1_1.img}  still in use (1) [unmount of ext4 sda]\\nWARNING: CPU: 4 PID: 359261 at fs/dcache.c:1767 umount_check+0x5d/0x70\\nCPU: 4 PID: 359261 Comm: umount Not tainted 6.6.0-dirty #25\\nRIP: 0010:umount_check+0x5d/0x70\\nCall Trace:\\n \u003cTASK\u003e\\n d_walk+0xda/0x2b0\\n do_one_tree+0x20/0x40\\n shrink_dcache_for_umount+0x2c/0x90\\n generic_shutdown_super+0x20/0x160\\n kill_block_super+0x1a/0x40\\n ext4_kill_sb+0x22/0x40\\n deactivate_locked_super+0x35/0x80\\n cleanup_mnt+0x104/0x160\\n==================================================================\\n\\nWhether cachefiles_open_file() returns true or false, the reference count\\nobtained by lookup_positive_unlocked() in cachefiles_look_up_object()\\nshould be released.\\n\\nTherefore release that reference count in cachefiles_look_up_object() to\\nfix the above issue and simplify the code.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:27:57.281Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-49870\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:27:57.281Z\", \"dateReserved\": \"2024-10-21T12:17:06.019Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T18:01:12.048Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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