cve-2024-38613
Vulnerability from cvelistv5
Published
2024-06-19 13:56
Modified
2024-12-19 09:05
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: m68k: Fix spinlock race in kernel thread creation Context switching does take care to retain the correct lock owner across the switch from 'prev' to 'next' tasks. This does rely on interrupts remaining disabled for the entire duration of the switch. This condition is guaranteed for normal process creation and context switching between already running processes, because both 'prev' and 'next' already have interrupts disabled in their saved copies of the status register. The situation is different for newly created kernel threads. The status register is set to PS_S in copy_thread(), which does leave the IPL at 0. Upon restoring the 'next' thread's status register in switch_to() aka resume(), interrupts then become enabled prematurely. resume() then returns via ret_from_kernel_thread() and schedule_tail() where run queue lock is released (see finish_task_switch() and finish_lock_switch()). A timer interrupt calling scheduler_tick() before the lock is released in finish_task_switch() will find the lock already taken, with the current task as lock owner. This causes a spinlock recursion warning as reported by Guenter Roeck. As far as I can ascertain, this race has been opened in commit 533e6903bea0 ("m68k: split ret_from_fork(), simplify kernel_thread()") but I haven't done a detailed study of kernel history so it may well predate that commit. Interrupts cannot be disabled in the saved status register copy for kernel threads (init will complain about interrupts disabled when finally starting user space). Disable interrupts temporarily when switching the tasks' register sets in resume(). Note that a simple oriw 0x700,%sr after restoring sr is not enough here - this leaves enough of a race for the 'spinlock recursion' warning to still be observed. Tested on ARAnyM and qemu (Quadra 800 emulation).
References
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
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0d9ae1253535f6e85a016e09c25ecbe6f7f59ef0
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2a8d1d95302c7d52c6ac8fa5cb4a6948ae0d3a14
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4eeffecc8e3cce25bb559502c2fd94a948bcde82
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5213cc01d0464c011fdc09f318705603ed3a746b
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/77b2b67a0f8bce260c53907e5749d61466d90c87
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/95f00caf767b5968c2c51083957b38be4748a78a
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/da89ce46f02470ef08f0f580755d14d547da59ed
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f1d4274a84c069be0f6098ab10c3443fc1f7134c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f3baf0f4f92af32943ebf27b960e0552c6c082fd
Impacted products
Vendor Product Version
Linux Linux Version: 533e6903bea0440816a0f517b0845ccea4cc7917
Version: 533e6903bea0440816a0f517b0845ccea4cc7917
Version: 533e6903bea0440816a0f517b0845ccea4cc7917
Version: 533e6903bea0440816a0f517b0845ccea4cc7917
Version: 533e6903bea0440816a0f517b0845ccea4cc7917
Version: 533e6903bea0440816a0f517b0845ccea4cc7917
Version: 533e6903bea0440816a0f517b0845ccea4cc7917
Version: 533e6903bea0440816a0f517b0845ccea4cc7917
Version: 533e6903bea0440816a0f517b0845ccea4cc7917
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      nvd: "{\"cve\":{\"id\":\"CVE-2024-38613\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-19T14:15:21.147\",\"lastModified\":\"2024-11-21T09:26:29.207\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nm68k: Fix spinlock race in kernel thread creation\\n\\nContext switching does take care to retain the correct lock owner across\\nthe switch from 'prev' to 'next' tasks.  This does rely on interrupts\\nremaining disabled for the entire duration of the switch.\\n\\nThis condition is guaranteed for normal process creation and context\\nswitching between already running processes, because both 'prev' and\\n'next' already have interrupts disabled in their saved copies of the\\nstatus register.\\n\\nThe situation is different for newly created kernel threads.  The status\\nregister is set to PS_S in copy_thread(), which does leave the IPL at 0.\\nUpon restoring the 'next' thread's 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't 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' 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 'spinlock recursion' 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 ejecución de bloqueo de giro en la creación de subprocesos del kernel. El cambio de contexto se encarga de retener el propietario del bloqueo correcto durante el cambio de las tareas 'anteriores' a las 'siguientes'. Esto depende de que las interrupciones permanezcan deshabilitadas durante toda la duración del cambio. Esta condición está garantizada para la creación normal de procesos y el cambio de contexto entre procesos que ya se están ejecutando, porque tanto 'anterior' como 'siguiente' ya tienen las interrupciones deshabilitadas en sus copias guardadas del registro de estado. La situación es diferente para los subprocesos del kernel recién 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 'siguiente' subproceso en switch_to() también conocido como resume(), las interrupciones se habilitan prematuramente. resume() luego regresa a través de ret_from_kernel_thread() y Schedule_tail() donde se libera el bloqueo de la cola de ejecución (consulte Finish_task_switch() y Finish_lock_switch()). Una interrupción del temporizador que llama a Scheduler_tick() antes de que se libere el bloqueo en Finish_task_switch() encontrará el bloqueo ya tomado, con la tarea actual como propietario del bloqueo. Esto provoca una advertencia de recursividad de spinlock según lo informado por Guenter Roeck. Hasta donde puedo determinar, esta ejecución se abrió 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 confirmación. Las interrupciones no se pueden deshabilitar en la copia del registro de estado guardado para los subprocesos del kernel (init se quejará 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(). Tenga en cuenta que un simple oriw 0x700,%sr después de restaurar sr no es suficiente aquí; esto deja suficiente ejecución para que aún se observe la advertencia de 'recursión de spinlock'. Probado en ARAnyM y qemu (emulación Quadra 800).\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0d9ae1253535f6e85a016e09c25ecbe6f7f59ef0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2a8d1d95302c7d52c6ac8fa5cb4a6948ae0d3a14\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4eeffecc8e3cce25bb559502c2fd94a948bcde82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5213cc01d0464c011fdc09f318705603ed3a746b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/77b2b67a0f8bce260c53907e5749d61466d90c87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95f00caf767b5968c2c51083957b38be4748a78a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/da89ce46f02470ef08f0f580755d14d547da59ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1d4274a84c069be0f6098ab10c3443fc1f7134c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f3baf0f4f92af32943ebf27b960e0552c6c082fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0d9ae1253535f6e85a016e09c25ecbe6f7f59ef0\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/2a8d1d95302c7d52c6ac8fa5cb4a6948ae0d3a14\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/4eeffecc8e3cce25bb559502c2fd94a948bcde82\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/5213cc01d0464c011fdc09f318705603ed3a746b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/77b2b67a0f8bce260c53907e5749d61466d90c87\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/95f00caf767b5968c2c51083957b38be4748a78a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/da89ce46f02470ef08f0f580755d14d547da59ed\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/f1d4274a84c069be0f6098ab10c3443fc1f7134c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/f3baf0f4f92af32943ebf27b960e0552c6c082fd\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
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This does rely on interrupts\\nremaining disabled for the entire duration of the switch.\\n\\nThis condition is guaranteed for normal process creation and context\\nswitching between already running processes, because both 'prev' and\\n'next' already have interrupts disabled in their saved copies of the\\nstatus register.\\n\\nThe situation is different for newly created kernel threads.  The status\\nregister is set to PS_S in copy_thread(), which does leave the IPL at 0.\\nUpon restoring the 'next' thread's 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't 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' 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 'spinlock recursion' warning to\\nstill be observed.\\n\\nTested on ARAnyM and qemu (Quadra 800 emulation).\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:05:39.279Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-38613\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:05:39.279Z\", \"dateReserved\": \"2024-06-18T19:36:34.944Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-19T13:56:14.083Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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