cve-2024-38613
Vulnerability from cvelistv5
Published
2024-06-19 13:56
Modified
2024-09-11 17:34
Severity
Summary
m68k: Fix spinlock race in kernel thread creation
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d9ae1253535f6e85a016e09c25ecbe6f7f59ef0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a8d1d95302c7d52c6ac8fa5cb4a6948ae0d3a14
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4eeffecc8e3cce25bb559502c2fd94a948bcde82
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5213cc01d0464c011fdc09f318705603ed3a746b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77b2b67a0f8bce260c53907e5749d61466d90c87
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95f00caf767b5968c2c51083957b38be4748a78a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da89ce46f02470ef08f0f580755d14d547da59ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1d4274a84c069be0f6098ab10c3443fc1f7134c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3baf0f4f92af32943ebf27b960e0552c6c082fd
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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The status\\nregister is set to PS_S in copy_thread(), which does leave the IPL at 0.\\nUpon restoring the \u0027next\u0027 thread\u0027s status register in switch_to() aka\\nresume(), interrupts then become enabled prematurely.  resume() then\\nreturns via ret_from_kernel_thread() and schedule_tail() where run queue\\nlock is released (see finish_task_switch() and finish_lock_switch()).\\n\\nA timer interrupt calling scheduler_tick() before the lock is released\\nin finish_task_switch() will find the lock already taken, with the\\ncurrent task as lock owner.  This causes a spinlock recursion warning as\\nreported by Guenter Roeck.\\n\\nAs far as I can ascertain, this race has been opened in commit\\n533e6903bea0 (\\\"m68k: split ret_from_fork(), simplify kernel_thread()\\\")\\nbut I haven\u0027t done a detailed study of kernel history so it may well\\npredate that commit.\\n\\nInterrupts cannot be disabled in the saved status register copy for\\nkernel threads (init will complain about interrupts disabled when\\nfinally starting user space).  Disable interrupts temporarily when\\nswitching the tasks\u0027 register sets in resume().\\n\\nNote that a simple oriw 0x700,%sr after restoring sr is not enough here\\n- this leaves enough of a race for the \u0027spinlock recursion\u0027 warning to\\nstill be observed.\\n\\nTested on ARAnyM and qemu (Quadra 800 emulation).\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: m68k: corrige la ejecuci\u00f3n de bloqueo de giro en la creaci\u00f3n de subprocesos del kernel. El cambio de contexto se encarga de retener el propietario del bloqueo correcto durante el cambio de las tareas \u0027anteriores\u0027 a las \u0027siguientes\u0027. Esto depende de que las interrupciones permanezcan deshabilitadas durante toda la duraci\u00f3n del cambio. Esta condici\u00f3n est\u00e1 garantizada para la creaci\u00f3n normal de procesos y el cambio de contexto entre procesos que ya se est\u00e1n ejecutando, porque tanto \u0027anterior\u0027 como \u0027siguiente\u0027 ya tienen las interrupciones deshabilitadas en sus copias guardadas del registro de estado. La situaci\u00f3n es diferente para los subprocesos del kernel reci\u00e9n creados. El registro de estado se establece en PS_S en copy_thread(), lo que deja la IPL en 0. Al restaurar el registro de estado del \u0027siguiente\u0027 subproceso en switch_to() tambi\u00e9n conocido como resume(), las interrupciones se habilitan prematuramente. resume() luego regresa a trav\u00e9s de ret_from_kernel_thread() y Schedule_tail() donde se libera el bloqueo de la cola de ejecuci\u00f3n (consulte Finish_task_switch() y Finish_lock_switch()). Una interrupci\u00f3n del temporizador que llama a Scheduler_tick() antes de que se libere el bloqueo en Finish_task_switch() encontrar\u00e1 el bloqueo ya tomado, con la tarea actual como propietario del bloqueo. Esto provoca una advertencia de recursividad de spinlock seg\u00fan lo informado por Guenter Roeck. Hasta donde puedo determinar, esta ejecuci\u00f3n se abri\u00f3 en el commit 533e6903bea0 (\\\"m68k: split ret_from_fork(), simplifica kernel_thread()\\\") pero no he realizado un estudio detallado de la historia del kernel, por lo que es posible que sea anterior a esa confirmaci\u00f3n. Las interrupciones no se pueden deshabilitar en la copia del registro de estado guardado para los subprocesos del kernel (init se quejar\u00e1 de las interrupciones deshabilitadas cuando finalmente inicie el espacio de usuario). Deshabilite las interrupciones temporalmente al cambiar los conjuntos de registros de tareas en resume(). 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