CVE-2024-53176 (GCVE-0-2024-53176)
Vulnerability from cvelistv5
Published
2024-12-27 13:49
Modified
2025-05-04 09:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: During unmount, ensure all cached dir instances drop their dentry The unmount process (cifs_kill_sb() calling close_all_cached_dirs()) can race with various cached directory operations, which ultimately results in dentries not being dropped and these kernel BUGs: BUG: Dentry ffff88814f37e358{i=1000000000080,n=/} still in use (2) [unmount of cifs cifs] VFS: Busy inodes after unmount of cifs (cifs) ------------[ cut here ]------------ kernel BUG at fs/super.c:661! This happens when a cfid is in the process of being cleaned up when, and has been removed from the cfids->entries list, including: - Receiving a lease break from the server - Server reconnection triggers invalidate_all_cached_dirs(), which removes all the cfids from the list - The laundromat thread decides to expire an old cfid. To solve these problems, dropping the dentry is done in queued work done in a newly-added cfid_put_wq workqueue, and close_all_cached_dirs() flushes that workqueue after it drops all the dentries of which it's aware. This is a global workqueue (rather than scoped to a mount), but the queued work is minimal. The final cleanup work for cleaning up a cfid is performed via work queued in the serverclose_wq workqueue; this is done separate from dropping the dentries so that close_all_cached_dirs() doesn't block on any server operations. Both of these queued works expect to invoked with a cfid reference and a tcon reference to avoid those objects from being freed while the work is ongoing. While we're here, add proper locking to close_all_cached_dirs(), and locking around the freeing of cfid->dentry.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3fa640d035e5ae526769615c35cb9ed4be6e3662
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/548812afd96982a76a93ba76c0582ea670c40d9e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/73934e535cffbda1490fa97d82690a0f9aa73e94
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff4528bbc82d0d90073751f7b49e7b9e9c7e5638
Impacted products
Vendor Product Version
Linux Linux Version: ebe98f1447bbccf8228335c62d86af02a0ed23f7
Version: ebe98f1447bbccf8228335c62d86af02a0ed23f7
Version: ebe98f1447bbccf8228335c62d86af02a0ed23f7
Version: ebe98f1447bbccf8228335c62d86af02a0ed23f7
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   Linux Linux Version: 6.1
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cached_dir.c",
            "fs/smb/client/cached_dir.h",
            "fs/smb/client/cifsfs.c",
            "fs/smb/client/cifsglob.h",
            "fs/smb/client/inode.c",
            "fs/smb/client/trace.h"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "programFiles": [
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            "fs/smb/client/cached_dir.h",
            "fs/smb/client/cifsfs.c",
            "fs/smb/client/cifsglob.h",
            "fs/smb/client/inode.c",
            "fs/smb/client/trace.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "status": "unaffected",
              "version": "6.6.64",
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            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: During unmount, ensure all cached dir instances drop their dentry\n\nThe unmount process (cifs_kill_sb() calling close_all_cached_dirs()) can\nrace with various cached directory operations, which ultimately results\nin dentries not being dropped and these kernel BUGs:\n\nBUG: Dentry ffff88814f37e358{i=1000000000080,n=/}  still in use (2) [unmount of cifs cifs]\nVFS: Busy inodes after unmount of cifs (cifs)\n------------[ cut here ]------------\nkernel BUG at fs/super.c:661!\n\nThis happens when a cfid is in the process of being cleaned up when, and\nhas been removed from the cfids-\u003eentries list, including:\n\n- Receiving a lease break from the server\n- Server reconnection triggers invalidate_all_cached_dirs(), which\n  removes all the cfids from the list\n- The laundromat thread decides to expire an old cfid.\n\nTo solve these problems, dropping the dentry is done in queued work done\nin a newly-added cfid_put_wq workqueue, and close_all_cached_dirs()\nflushes that workqueue after it drops all the dentries of which it\u0027s\naware. This is a global workqueue (rather than scoped to a mount), but\nthe queued work is minimal.\n\nThe final cleanup work for cleaning up a cfid is performed via work\nqueued in the serverclose_wq workqueue; this is done separate from\ndropping the dentries so that close_all_cached_dirs() doesn\u0027t block on\nany server operations.\n\nBoth of these queued works expect to invoked with a cfid reference and\na tcon reference to avoid those objects from being freed while the work\nis ongoing.\n\nWhile we\u0027re here, add proper locking to close_all_cached_dirs(), and\nlocking around the freeing of cfid-\u003edentry."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T09:54:58.234Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/73934e535cffbda1490fa97d82690a0f9aa73e94"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff4528bbc82d0d90073751f7b49e7b9e9c7e5638"
        },
        {
          "url": "https://git.kernel.org/stable/c/548812afd96982a76a93ba76c0582ea670c40d9e"
        },
        {
          "url": "https://git.kernel.org/stable/c/3fa640d035e5ae526769615c35cb9ed4be6e3662"
        }
      ],
      "title": "smb: During unmount, ensure all cached dir instances drop their dentry",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-53176",
    "datePublished": "2024-12-27T13:49:20.518Z",
    "dateReserved": "2024-11-19T17:17:25.007Z",
    "dateUpdated": "2025-05-04T09:54:58.234Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-53176\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T14:15:24.947\",\"lastModified\":\"2024-12-27T14:15:24.947\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: During unmount, ensure all cached dir instances drop their dentry\\n\\nThe unmount process (cifs_kill_sb() calling close_all_cached_dirs()) can\\nrace with various cached directory operations, which ultimately results\\nin dentries not being dropped and these kernel BUGs:\\n\\nBUG: Dentry ffff88814f37e358{i=1000000000080,n=/}  still in use (2) [unmount of cifs cifs]\\nVFS: Busy inodes after unmount of cifs (cifs)\\n------------[ cut here ]------------\\nkernel BUG at fs/super.c:661!\\n\\nThis happens when a cfid is in the process of being cleaned up when, and\\nhas been removed from the cfids-\u003eentries list, including:\\n\\n- Receiving a lease break from the server\\n- Server reconnection triggers invalidate_all_cached_dirs(), which\\n  removes all the cfids from the list\\n- The laundromat thread decides to expire an old cfid.\\n\\nTo solve these problems, dropping the dentry is done in queued work done\\nin a newly-added cfid_put_wq workqueue, and close_all_cached_dirs()\\nflushes that workqueue after it drops all the dentries of which it\u0027s\\naware. This is a global workqueue (rather than scoped to a mount), but\\nthe queued work is minimal.\\n\\nThe final cleanup work for cleaning up a cfid is performed via work\\nqueued in the serverclose_wq workqueue; this is done separate from\\ndropping the dentries so that close_all_cached_dirs() doesn\u0027t block on\\nany server operations.\\n\\nBoth of these queued works expect to invoked with a cfid reference and\\na tcon reference to avoid those objects from being freed while the work\\nis ongoing.\\n\\nWhile we\u0027re here, add proper locking to close_all_cached_dirs(), and\\nlocking around the freeing of cfid-\u003edentry.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3fa640d035e5ae526769615c35cb9ed4be6e3662\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/548812afd96982a76a93ba76c0582ea670c40d9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/73934e535cffbda1490fa97d82690a0f9aa73e94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff4528bbc82d0d90073751f7b49e7b9e9c7e5638\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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