cve-2024-47660
Vulnerability from cvelistv5
Published
2024-10-09 14:02
Modified
2024-12-19 09:25
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fsnotify: clear PARENT_WATCHED flags lazily In some setups directories can have many (usually negative) dentries. Hence __fsnotify_update_child_dentry_flags() function can take a significant amount of time. Since the bulk of this function happens under inode->i_lock this causes a significant contention on the lock when we remove the watch from the directory as the __fsnotify_update_child_dentry_flags() call from fsnotify_recalc_mask() races with __fsnotify_update_child_dentry_flags() calls from __fsnotify_parent() happening on children. This can lead upto softlockup reports reported by users. Fix the problem by calling fsnotify_update_children_dentry_flags() to set PARENT_WATCHED flags only when parent starts watching children. When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in __fsnotify_parent() for each accessed child.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5Patch
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

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                "id": "CVE-2024-47660",
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                "role": "CISA Coordinator",
                "timestamp": "2024-10-10T13:23:14.677657Z",
                "version": "2.0.3"
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          "programFiles": [
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    "datePublished": "2024-10-09T14:02:54.884Z",
    "dateReserved": "2024-09-30T16:00:12.935Z",
    "dateUpdated": "2024-12-19T09:25:12.205Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-47660\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-09T14:15:07.730\",\"lastModified\":\"2024-10-23T17:00:47.747\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfsnotify: clear PARENT_WATCHED flags lazily\\n\\nIn some setups directories can have many (usually negative) dentries.\\nHence __fsnotify_update_child_dentry_flags() function can take a\\nsignificant amount of time. Since the bulk of this function happens\\nunder inode-\u003ei_lock this causes a significant contention on the lock\\nwhen we remove the watch from the directory as the\\n__fsnotify_update_child_dentry_flags() call from fsnotify_recalc_mask()\\nraces with __fsnotify_update_child_dentry_flags() calls from\\n__fsnotify_parent() happening on children. This can lead upto softlockup\\nreports reported by users.\\n\\nFix the problem by calling fsnotify_update_children_dentry_flags() to\\nset PARENT_WATCHED flags only when parent starts watching children.\\n\\nWhen parent stops watching children, clear false positive PARENT_WATCHED\\nflags lazily in __fsnotify_parent() for each accessed child.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fsnotify: borrar indicadores PARENT_WATCHED de forma diferida En algunas configuraciones, los directorios pueden tener muchas entradas (normalmente negativas). Por lo tanto, la funci\u00f3n __fsnotify_update_child_dentry_flags() puede tardar una cantidad significativa de tiempo. Dado que la mayor parte de esta funci\u00f3n se realiza en inode-\u0026gt;i_lock, esto provoca una contenci\u00f3n significativa en el bloqueo cuando eliminamos la vigilancia del directorio, ya que la llamada __fsnotify_update_child_dentry_flags() desde fsnotify_recalc_mask() compite con las llamadas __fsnotify_update_child_dentry_flags() desde __fsnotify_parent() que ocurren en los hijos. Esto puede provocar informes de bloqueo suave informados por los usuarios. Solucione el problema llamando a fsnotify_update_children_dentry_flags() para establecer los indicadores PARENT_WATCHED solo cuando el padre comience a vigilar a los hijos. Cuando el padre deja de vigilar a los hijos, borra los indicadores de falsos positivos PARENT_WATCHED de forma diferida en __fsnotify_parent() para cada hijo al que acceda.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.10.226\",\"matchCriteriaId\":\"2C67534D-8BBC-4069-8DEA-62295B16358C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.167\",\"matchCriteriaId\":\"043405A4-25FE-45D4-A7BB-2A0C3B7D17C1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.109\",\"matchCriteriaId\":\"790F505A-7933-48F1-B038-380A8BC5C153\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.50\",\"matchCriteriaId\":\"A56A0460-B122-44D6-B0E6-26CE9C891536\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.9\",\"matchCriteriaId\":\"F4469C96-A86B-4CC3-B2D5-C21B6B72641B\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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