cve-2024-26806
Vulnerability from cvelistv5
Published
2024-04-04 08:20
Modified
2024-11-05 09:16
Severity ?
Summary
spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/041562ebc4759c9932b59a06527f8753b86da365
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/959043afe53ae80633e810416cee6076da6e91c6
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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                "id": "CVE-2024-26806",
                "options": [
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                "role": "CISA Coordinator",
                "timestamp": "2024-04-05T17:28:20.913168Z",
                "version": "2.0.3"
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          "dateUpdated": "2024-06-04T17:49:23.037Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            "url": "https://git.kernel.org/stable/c/959043afe53ae80633e810416cee6076da6e91c6"
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    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/spi/spi-cadence-quadspi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks\n\nThe -\u003eruntime_suspend() and -\u003eruntime_resume() callbacks are not\nexpected to call spi_controller_suspend() and spi_controller_resume().\nRemove calls to those in the cadence-qspi driver.\n\nThose helpers have two roles currently:\n - They stop/start the queue, including dealing with the kworker.\n - They toggle the SPI controller SPI_CONTROLLER_SUSPENDED flag. It\n   requires acquiring ctlr-\u003ebus_lock_mutex.\n\nStep one is irrelevant because cadence-qspi is not queued. Step two\nhowever has two implications:\n - A deadlock occurs, because -\u003eruntime_resume() is called in a context\n   where the lock is already taken (in the -\u003eexec_op() callback, where\n   the usage count is incremented).\n - It would disallow all operations once the device is auto-suspended.\n\nHere is a brief call tree highlighting the mutex deadlock:\n\nspi_mem_exec_op()\n        ...\n        spi_mem_access_start()\n                mutex_lock(\u0026ctlr-\u003ebus_lock_mutex)\n\n        cqspi_exec_mem_op()\n                pm_runtime_resume_and_get()\n                        cqspi_resume()\n                                spi_controller_resume()\n                                        mutex_lock(\u0026ctlr-\u003ebus_lock_mutex)\n                ...\n\n        spi_mem_access_end()\n                mutex_unlock(\u0026ctlr-\u003ebus_lock_mutex)\n        ..."
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      "title": "spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26806",
    "datePublished": "2024-04-04T08:20:33.512Z",
    "dateReserved": "2024-02-19T14:20:24.179Z",
    "dateUpdated": "2024-11-05T09:16:10.465Z",
    "state": "PUBLISHED"
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  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26806\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-04T09:15:09.333\",\"lastModified\":\"2024-04-04T12:48:22.650\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nspi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks\\n\\nThe -\u003eruntime_suspend() and -\u003eruntime_resume() callbacks are not\\nexpected to call spi_controller_suspend() and spi_controller_resume().\\nRemove calls to those in the cadence-qspi driver.\\n\\nThose helpers have two roles currently:\\n - They stop/start the queue, including dealing with the kworker.\\n - They toggle the SPI controller SPI_CONTROLLER_SUSPENDED flag. It\\n   requires acquiring ctlr-\u003ebus_lock_mutex.\\n\\nStep one is irrelevant because cadence-qspi is not queued. Step two\\nhowever has two implications:\\n - A deadlock occurs, because -\u003eruntime_resume() is called in a context\\n   where the lock is already taken (in the -\u003eexec_op() callback, where\\n   the usage count is incremented).\\n - It would disallow all operations once the device is auto-suspended.\\n\\nHere is a brief call tree highlighting the mutex deadlock:\\n\\nspi_mem_exec_op()\\n        ...\\n        spi_mem_access_start()\\n                mutex_lock(\u0026ctlr-\u003ebus_lock_mutex)\\n\\n        cqspi_exec_mem_op()\\n                pm_runtime_resume_and_get()\\n                        cqspi_resume()\\n                                spi_controller_resume()\\n                                        mutex_lock(\u0026ctlr-\u003ebus_lock_mutex)\\n                ...\\n\\n        spi_mem_access_end()\\n                mutex_unlock(\u0026ctlr-\u003ebus_lock_mutex)\\n        ...\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: spi: cadence-qspi: elimina las llamadas auxiliares de suspensi\u00f3n en todo el sistema desde los ganchos PM en tiempo de ejecuci\u00f3n No se espera que las devoluciones de llamada -\u0026gt;runtime_suspend() y -\u0026gt;runtime_resume() llamen a spi_controller_suspend() y spi_controller_resume(). Elimina llamadas a aquellos en el controlador cadence-qspi. Esos ayudantes tienen actualmente dos funciones: - Detienen/inician la cola, incluido el trato con el kworker. - Alternan el indicador SPI_CONTROLLER_SUSPENDED del controlador SPI. Requiere adquirir ctlr-\u0026gt;bus_lock_mutex. El primer paso es irrelevante porque cadence-qspi no est\u00e1 en cola. Sin embargo, el segundo paso tiene dos implicaciones: - Se produce un punto muerto, porque -\u0026gt;runtime_resume() se llama en un contexto donde el bloqueo ya est\u00e1 tomado (en la devoluci\u00f3n de llamada -\u0026gt;exec_op(), donde se incrementa el recuento de uso). - No permitir\u00eda todas las operaciones una vez que el dispositivo se autosuspenda. Aqu\u00ed hay un breve \u00e1rbol de llamadas que resalta el interbloqueo mutex: spi_mem_exec_op() ... spi_mem_access_start() mutex_lock(\u0026amp;ctlr-\u0026gt;bus_lock_mutex) cqspi_exec_mem_op() pm_runtime_resume_and_get() cqspi_resume() spi_controller_resume() mutex_lock(\u0026amp;ctlr-\u0026gt;bus_lock_mutex) ... spi_mem _acceso_end () mutex_unlock(\u0026amp;ctlr-\u0026gt;bus_lock_mutex) ...\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/041562ebc4759c9932b59a06527f8753b86da365\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/959043afe53ae80633e810416cee6076da6e91c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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}


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