CVE-2023-52609 (GCVE-0-2023-52609)
Vulnerability from cvelistv5
Published
2024-03-18 10:07
Modified
2025-05-04 07:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: binder: fix race between mmput() and do_exit() Task A calls binder_update_page_range() to allocate and insert pages on a remote address space from Task B. For this, Task A pins the remote mm via mmget_not_zero() first. This can race with Task B do_exit() and the final mmput() refcount decrement will come from Task A. Task A | Task B ------------------+------------------ mmget_not_zero() | | do_exit() | exit_mm() | mmput() mmput() | exit_mmap() | remove_vma() | fput() | In this case, the work of ____fput() from Task B is queued up in Task A as TWA_RESUME. So in theory, Task A returns to userspace and the cleanup work gets executed. However, Task A instead sleep, waiting for a reply from Task B that never comes (it's dead). This means the binder_deferred_release() is blocked until an unrelated binder event forces Task A to go back to userspace. All the associated death notifications will also be delayed until then. In order to fix this use mmput_async() that will schedule the work in the corresponding mm->async_put_work WQ instead of Task A.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/252a2a5569eb9f8d16428872cc24dea1ac0bb097 Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/6696f76c32ff67fec26823fc2df46498e70d9bf3 Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3e Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/77d210e8db4d61d43b2d16df66b1ec46fad2ee01 Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/7e7a0d86542b0ea903006d3f42f33c4f7ead6918 Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/95b1d336b0642198b56836b89908d07b9a0c9608 Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/98fee5bee97ad47b527a997d5786410430d1f0e9 Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/9a9ab0d963621d9d12199df9817e66982582d5a5 Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/252a2a5569eb9f8d16428872cc24dea1ac0bb097 Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/6696f76c32ff67fec26823fc2df46498e70d9bf3 Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3e Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/77d210e8db4d61d43b2d16df66b1ec46fad2ee01 Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/7e7a0d86542b0ea903006d3f42f33c4f7ead6918 Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/95b1d336b0642198b56836b89908d07b9a0c9608 Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/98fee5bee97ad47b527a997d5786410430d1f0e9 Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/9a9ab0d963621d9d12199df9817e66982582d5a5 Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html Mailing List
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html Mailing List
Impacted products
Vendor Product Version
Linux Linux Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
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    "dateUpdated": "2025-05-04T07:39:48.513Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52609\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-18T11:15:07.743\",\"lastModified\":\"2025-03-10T15:28:37.830\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbinder: fix race between mmput() and do_exit()\\n\\nTask A calls binder_update_page_range() to allocate and insert pages on\\na remote address space from Task B. For this, Task A pins the remote mm\\nvia mmget_not_zero() first. This can race with Task B do_exit() and the\\nfinal mmput() refcount decrement will come from Task A.\\n\\n  Task A            | Task B\\n  ------------------+------------------\\n  mmget_not_zero()  |\\n                    |  do_exit()\\n                    |    exit_mm()\\n                    |      mmput()\\n  mmput()           |\\n    exit_mmap()     |\\n      remove_vma()  |\\n        fput()      |\\n\\nIn this case, the work of ____fput() from Task B is queued up in Task A\\nas TWA_RESUME. So in theory, Task A returns to userspace and the cleanup\\nwork gets executed. However, Task A instead sleep, waiting for a reply\\nfrom Task B that never comes (it\u0027s dead).\\n\\nThis means the binder_deferred_release() is blocked until an unrelated\\nbinder event forces Task A to go back to userspace. All the associated\\ndeath notifications will also be delayed until then.\\n\\nIn order to fix this use mmput_async() that will schedule the work in\\nthe corresponding mm-\u003easync_put_work WQ instead of Task A.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: binder: corrige la ejecuci\u00f3n entre mmput() y do_exit() La tarea A llama a binder_update_page_range() para asignar e insertar p\u00e1ginas en un espacio de direcciones remoto desde la tarea B. Para esto, la tarea A fija el mm remoto a trav\u00e9s de mmget_not_zero() primero. Esto puede competir con la Tarea B do_exit() y la disminuci\u00f3n final del recuento de mmput() provendr\u00e1 de la Tarea A. Tarea A | Tarea B ------------------+------------------ mmget_not_zero() | | hacer_salir() | salida_mm() | mmput() mmput() | salida_mmap() | eliminar_vma() | salida() | En este caso, el trabajo de ____fput() de la Tarea B se pone en cola en la Tarea A como TWA_RESUME. Entonces, en teor\u00eda, la Tarea A regresa al espacio de usuario y se ejecuta el trabajo de limpieza. Sin embargo, la Tarea A duerme, esperando una respuesta de la Tarea B que nunca llega (est\u00e1 muerta). Esto significa que binder_deferred_release() est\u00e1 bloqueado hasta que un evento de carpeta no relacionado obligue a la Tarea A a regresar al espacio de usuario. Todas las notificaciones de defunci\u00f3n asociadas tambi\u00e9n se retrasar\u00e1n hasta entonces. Para solucionar este problema, utilice mmput_async() que programar\u00e1 el trabajo en el mm-\u0026gt;async_put_work WQ correspondiente en lugar de la Tarea 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      "cveMetadata": "{\"cveId\": \"CVE-2023-52609\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:39:48.513Z\", \"dateReserved\": \"2024-03-06T09:52:12.088Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-18T10:07:45.486Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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