cve-2024-26806
Vulnerability from cvelistv5
Published
2024-04-04 08:20
Modified
2024-12-19 08:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks The ->runtime_suspend() and ->runtime_resume() callbacks are not expected to call spi_controller_suspend() and spi_controller_resume(). Remove calls to those in the cadence-qspi driver. Those helpers have two roles currently: - They stop/start the queue, including dealing with the kworker. - They toggle the SPI controller SPI_CONTROLLER_SUSPENDED flag. It requires acquiring ctlr->bus_lock_mutex. Step one is irrelevant because cadence-qspi is not queued. Step two however has two implications: - A deadlock occurs, because ->runtime_resume() is called in a context where the lock is already taken (in the ->exec_op() callback, where the usage count is incremented). - It would disallow all operations once the device is auto-suspended. Here is a brief call tree highlighting the mutex deadlock: spi_mem_exec_op() ... spi_mem_access_start() mutex_lock(&ctlr->bus_lock_mutex) cqspi_exec_mem_op() pm_runtime_resume_and_get() cqspi_resume() spi_controller_resume() mutex_lock(&ctlr->bus_lock_mutex) ... spi_mem_access_end() mutex_unlock(&ctlr->bus_lock_mutex) ...
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/041562ebc4759c9932b59a06527f8753b86da365
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/959043afe53ae80633e810416cee6076da6e91c6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/041562ebc4759c9932b59a06527f8753b86da365
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/959043afe53ae80633e810416cee6076da6e91c6
Impacted products
Vendor Product Version
Linux Linux Version: 6.7
Show details on NVD website

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    "dateReserved": "2024-02-19T14:20:24.179Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26806\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-04T09:15:09.333\",\"lastModified\":\"2024-11-21T09:03:07.020\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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\"},{\"url\":\"https://git.kernel.org/stable/c/041562ebc4759c9932b59a06527f8753b86da365\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/959043afe53ae80633e810416cee6076da6e91c6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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