cve-2023-52836
Vulnerability from cvelistv5
Published
2024-05-21 15:31
Modified
2024-12-19 08:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: locking/ww_mutex/test: Fix potential workqueue corruption In some cases running with the test-ww_mutex code, I was seeing odd behavior where sometimes it seemed flush_workqueue was returning before all the work threads were finished. Often this would cause strange crashes as the mutexes would be freed while they were being used. Looking at the code, there is a lifetime problem as the controlling thread that spawns the work allocates the "struct stress" structures that are passed to the workqueue threads. Then when the workqueue threads are finished, they free the stress struct that was passed to them. Unfortunately the workqueue work_struct node is in the stress struct. Which means the work_struct is freed before the work thread returns and while flush_workqueue is waiting. It seems like a better idea to have the controlling thread both allocate and free the stress structures, so that we can be sure we don't corrupt the workqueue by freeing the structure prematurely. So this patch reworks the test to do so, and with this change I no longer see the early flush_workqueue returns.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/304a2c4aad0fff887ce493e4197bf9cbaf394479
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ed2d68b3925145f5f51c46559484881d6082f75
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bccdd808902f8c677317cec47c306e42b93b849e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c56df79d68677cf062da1b6e3b33e74299a92dfc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4d37c9e6a4dbcca958dabd99216550525c7e389
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d8267cabbe1bed15ccf8b0e684c528bf8eeef715
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dcd85e3c929368076a7592b27f541e0da8b427f5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e36407713163363e65566e7af0abe207d5f59a0c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e89d0ed45a419c485bae999426ecf92697cbdda3
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/304a2c4aad0fff887ce493e4197bf9cbaf394479
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9ed2d68b3925145f5f51c46559484881d6082f75
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bccdd808902f8c677317cec47c306e42b93b849e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c56df79d68677cf062da1b6e3b33e74299a92dfc
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d4d37c9e6a4dbcca958dabd99216550525c7e389
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d8267cabbe1bed15ccf8b0e684c528bf8eeef715
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dcd85e3c929368076a7592b27f541e0da8b427f5
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e36407713163363e65566e7af0abe207d5f59a0c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e89d0ed45a419c485bae999426ecf92697cbdda3
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

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En algunos casos, al ejecutar el c\u00f3digo test-ww_mutex, ve\u00eda un comportamiento extra\u00f1o en el que a veces parec\u00eda que flush_workqueue regresaba antes que todos los subprocesos de trabajo. hemos terminado. A menudo, esto causar\u00eda fallas extra\u00f1as ya que los mutex se liberar\u00edan mientras se estaban usando. Al observar el c\u00f3digo, hay un problema de duraci\u00f3n, ya que el subproceso de control que genera el trabajo asigna las estructuras de \\\"estr\u00e9s de estructura\\\" que se pasan a los subprocesos de la cola de trabajo. Luego, cuando los subprocesos de la cola de trabajo finalizan, liberan la estructura de tensi\u00f3n que se les pas\u00f3. Desafortunadamente, el nodo work_struct de la cola de trabajo est\u00e1 en la estructura de estr\u00e9s. Lo que significa que work_struct se libera antes de que regrese el hilo de trabajo y mientras descarga_workqueue est\u00e1 esperando. 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