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fsnotify: clear PARENT_WATCHED flags lazily

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2024-47660

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2024-47660

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
        "lessThan": "3f3ef1d9f66b93913ce2171120d9226b55acd41d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
        "lessThan": "f9a48bc3dd9099935751458a5bbbea4b7c28abc8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
        "lessThan": "d8c42405fc3507cc43ba7e4986a773c3fc633f6e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
        "lessThan": "fc1b1e135c3f72382f792e6c319fc088d5523ad5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
        "lessThan": "7ef1d2e240c32b1f337a37232d037b07e3919e1a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "873feea09ebc980cbd3631b767356ce1eee65ec1",
        "lessThan": "172e422ffea20a89bfdc672741c1aad6fbb5044e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/notify/fsnotify.c",
      "fs/notify/fsnotify.h",
      "fs/notify/mark.c",
      "include/linux/fsnotify_backend.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.38"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.38",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.226",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.167",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.10.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.10.*"
      },
      {
        "status": "unaffected",
        "version": "6.11",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/notify/fsnotify.c",
      "fs/notify/fsnotify.h",
      "fs/notify/mark.c",
      "include/linux/fsnotify_backend.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-47660

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#26721 · Revision 1
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Publisher date
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