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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               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->i_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->i_flags & S_KERNEL_FILE))\n            can_use = true\n\t  return false\n        return false\n        // Returns an error but doesn't 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 <TASK>\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.",
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            },
            {
               url: "https://git.kernel.org/stable/c/da6ef2dffe6056aad3435e6cf7c6471c2a62187c",
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         ],
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   cveMetadata: {
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      assignerShortName: "Linux",
      cveId: "CVE-2024-49870",
      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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      nvd: "{\"cve\":{\"id\":\"CVE-2024-49870\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:08.413\",\"lastModified\":\"2024-10-25T12:55:03.577\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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->i_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->i_flags & S_KERNEL_FILE))\\n            can_use = true\\n\\t  return false\\n        return false\\n        // Returns an error but doesn't 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 <TASK>\\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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cachefiles: se corrige la pérdida de dentry en cachefiles_open_file(). Una pérdida de dentry puede producirse cuando una cookie de búsqueda y un cull son concurrentes: P1 | P2 ----------------------------------------------------------- cachefiles_lookup_cookie cachefiles_look_up_object lookup_one_positive_unlocked // obtener dentry cachefiles_cull inode-&gt;i_flags |= S_KERNEL_FILE; cachefiles_open_file cachefiles_mark_inode_in_use __cachefiles_mark_inode_in_use can_use = false if (!(inode-&gt;i_flags &amp; S_KERNEL_FILE)) can_use = true return false return false // Devuelve un error pero no coloca dentry Después de eso, se activará la siguiente ADVERTENCIA cuando se desmonte la carpeta del backend: ===================================================================== ERROR: Dentry 000000008ad87947{i=7a,n=Dx_1_1.img} todavía 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 código.\"}],\"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->i_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->i_flags & S_KERNEL_FILE))\\n            can_use = true\\n\\t  return false\\n        return false\\n        // Returns an error but doesn't 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 <TASK>\\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\"}}}",
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}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.