fkie_cve-2024-49985
Vulnerability from fkie_nvd
Published
2024-10-21 18:15
Modified
2024-11-08 16:15
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: i2c: stm32f7: Do not prepare/unprepare clock during runtime suspend/resume In case there is any sort of clock controller attached to this I2C bus controller, for example Versaclock or even an AIC32x4 I2C codec, then an I2C transfer triggered from the clock controller clk_ops .prepare callback may trigger a deadlock on drivers/clk/clk.c prepare_lock mutex. This is because the clock controller first grabs the prepare_lock mutex and then performs the prepare operation, including its I2C access. The I2C access resumes this I2C bus controller via .runtime_resume callback, which calls clk_prepare_enable(), which attempts to grab the prepare_lock mutex again and deadlocks. Since the clock are already prepared since probe() and unprepared in remove(), use simple clk_enable()/clk_disable() calls to enable and disable the clock on runtime suspend and resume, to avoid hitting the prepare_lock mutex.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/048bbbdbf85e5e00258dfb12f5e368f908801d7bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1883cad2cc629ded4a3556c0bbb8b42533ad8764Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22a1f8a5b56ba93d3e8b7a1dafa24e01c8bb48baPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/894cd5f5fd9061983445bbd1fa3d81be43095344Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9b8bc33ad64192f54142396470cc34ce539a8940Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2024b1a583ab9176c797ea1e5f57baf8d5e2682Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6f1250a4d5773f447740b9fe37b8692105796d4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fac3c9f7784e8184c0338e9f0877b81e55d3ef1cPatch
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 6.12


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: stm32f7: Do not prepare/unprepare clock during runtime suspend/resume\n\nIn case there is any sort of clock controller attached to this I2C bus\ncontroller, for example Versaclock or even an AIC32x4 I2C codec, then\nan I2C transfer triggered from the clock controller clk_ops .prepare\ncallback may trigger a deadlock on drivers/clk/clk.c prepare_lock mutex.\n\nThis is because the clock controller first grabs the prepare_lock mutex\nand then performs the prepare operation, including its I2C access. The\nI2C access resumes this I2C bus controller via .runtime_resume callback,\nwhich calls clk_prepare_enable(), which attempts to grab the prepare_lock\nmutex again and deadlocks.\n\nSince the clock are already prepared since probe() and unprepared in\nremove(), use simple clk_enable()/clk_disable() calls to enable and\ndisable the clock on runtime suspend and resume, to avoid hitting the\nprepare_lock mutex."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: i2c: stm32f7: No preparar/despreparar el reloj durante la suspensi\u00f3n/reanudaci\u00f3n en tiempo de ejecuci\u00f3n En caso de que haya alg\u00fan tipo de controlador de reloj conectado a este controlador de bus I2C, por ejemplo Versaclock o incluso un c\u00f3dec I2C AIC32x4, entonces una transferencia I2C activada desde la devoluci\u00f3n de llamada clk_ops .prepare del controlador de reloj puede activar un bloqueo en el mutex prepare_lock de drivers/clk/clk.c. Esto se debe a que el controlador de reloj primero toma el mutex prepare_lock y luego realiza la operaci\u00f3n de preparaci\u00f3n, incluido su acceso I2C. El acceso I2C reanuda este controlador de bus I2C a trav\u00e9s de la devoluci\u00f3n de llamada .runtime_resume, que llama a clk_prepare_enable(), que intenta tomar el mutex prepare_lock nuevamente y se bloquea. Dado que el reloj ya est\u00e1 preparado desde probe() y no preparado en remove(), use llamadas clk_enable()/clk_disable() simples para habilitar y deshabilitar el reloj en la suspensi\u00f3n y reanudaci\u00f3n del tiempo de ejecuci\u00f3n, para evitar alcanzar el mutex prepare_lock."
    }
  ],
  "id": "CVE-2024-49985",
  "lastModified": "2024-11-08T16:15:39.950",
  "metrics": {
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        "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"
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  "published": "2024-10-21T18:15:18.950",
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  "vulnStatus": "Modified",
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          "lang": "en",
          "value": "CWE-667"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}


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