fkie_cve-2024-56780
Vulnerability from fkie_nvd
Published
2025-01-08 18:15
Modified
2025-01-09 21:50
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: quota: flush quota_release_work upon quota writeback One of the paths quota writeback is called from is: freeze_super() sync_filesystem() ext4_sync_fs() dquot_writeback_dquots() Since we currently don't always flush the quota_release_work queue in this path, we can end up with the following race: 1. dquot are added to releasing_dquots list during regular operations. 2. FS Freeze starts, however, this does not flush the quota_release_work queue. 3. Freeze completes. 4. Kernel eventually tries to flush the workqueue while FS is frozen which hits a WARN_ON since transaction gets started during frozen state: ext4_journal_check_start+0x28/0x110 [ext4] (unreliable) __ext4_journal_start_sb+0x64/0x1c0 [ext4] ext4_release_dquot+0x90/0x1d0 [ext4] quota_release_workfn+0x43c/0x4d0 Which is the following line: WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); Which ultimately results in generic/390 failing due to dmesg noise. This was detected on powerpc machine 15 cores. To avoid this, make sure to flush the workqueue during dquot_writeback_dquots() so we dont have any pending workitems after freeze.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6f3821acd7c3143145999248087de5fb4b48cf26Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8ea87e34792258825d290f4dc5216276e91cb224Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5abba5e0e586e258ded3e798fe5f69c66fec198Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ac6f420291b3fee1113f21d612fa88b628afab5bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bcacb52a985f1b6d280f698a470b873dfe52728aPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.13


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nquota: flush quota_release_work upon quota writeback\n\nOne of the paths quota writeback is called from is:\n\nfreeze_super()\n  sync_filesystem()\n    ext4_sync_fs()\n      dquot_writeback_dquots()\n\nSince we currently don\u0027t always flush the quota_release_work queue in\nthis path, we can end up with the following race:\n\n 1. dquot are added to releasing_dquots list during regular operations.\n 2. FS Freeze starts, however, this does not flush the quota_release_work queue.\n 3. Freeze completes.\n 4. Kernel eventually tries to flush the workqueue while FS is frozen which\n    hits a WARN_ON since transaction gets started during frozen state:\n\n  ext4_journal_check_start+0x28/0x110 [ext4] (unreliable)\n  __ext4_journal_start_sb+0x64/0x1c0 [ext4]\n  ext4_release_dquot+0x90/0x1d0 [ext4]\n  quota_release_workfn+0x43c/0x4d0\n\nWhich is the following line:\n\n  WARN_ON(sb-\u003es_writers.frozen == SB_FREEZE_COMPLETE);\n\nWhich ultimately results in generic/390 failing due to dmesg\nnoise. This was detected on powerpc machine 15 cores.\n\nTo avoid this, make sure to flush the workqueue during\ndquot_writeback_dquots() so we dont have any pending workitems after\nfreeze."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: quota: vaciar quota_release_work al reescribir la cuota Una de las rutas desde las que se llama a la reescritura de cuota es: freeze_super() sync_filesystem() ext4_sync_fs() dquot_writeback_dquots() Dado que actualmente no siempre vaciamos la cola quota_release_work en esta ruta, podemos terminar con la siguiente ejecuci\u00f3n: 1. dquot se agregan a la lista release_dquots durante las operaciones regulares. 2. FS Freeze comienza, sin embargo, esto no vac\u00eda la cola quota_release_work. 3. Freeze se completa. 4. El kernel finalmente intenta vaciar la cola de trabajo mientras FS est\u00e1 congelado, lo que genera un WARN_ON ya que la transacci\u00f3n se inicia durante el estado congelado: ext4_journal_check_start+0x28/0x110 [ext4] (no confiable) __ext4_journal_start_sb+0x64/0x1c0 [ext4] ext4_release_dquot+0x90/0x1d0 [ext4] quota_release_workfn+0x43c/0x4d0 Que es la siguiente l\u00ednea: WARN_ON(sb-\u0026gt;s_writers.frozen == SB_FREEZE_COMPLETE); Lo que finalmente da como resultado que generic/390 falle debido al ruido de dmesg. Esto se detect\u00f3 en una m\u00e1quina PowerPC de 15 n\u00facleos. Para evitar esto, aseg\u00farese de vaciar la cola de trabajo durante dquot_writeback_dquots() para que no tengamos ning\u00fan elemento de trabajo pendiente despu\u00e9s del congelamiento."
    }
  ],
  "id": "CVE-2024-56780",
  "lastModified": "2025-01-09T21:50:02.050",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-01-08T18:15:18.910",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}


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