CVE-2023-52609
binder: fix race between mmput() and do_exit()
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: binder: corrige la ejecución entre mmput() y do_exit() La tarea A llama a binder_update_page_range() para asignar e insertar páginas en un espacio de direcciones remoto desde la tarea B. Para esto, la tarea A fija el mm remoto a través de mmget_not_zero() primero. Esto puede competir con la Tarea B do_exit() y la disminución final del recuento de mmput() provendrá 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 teoría, 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 (está muerta). Esto significa que binder_deferred_release() está bloqueado hasta que un evento de carpeta no relacionado obligue a la Tarea A a regresar al espacio de usuario. Todas las notificaciones de defunción asociadas también se retrasarán hasta entonces. Para solucionar este problema, utilice mmput_async() que programará el trabajo en el mm->async_put_work WQ correspondiente en lugar de la Tarea A.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-03-06 CVE Reserved
- 2024-03-18 CVE Published
- 2024-03-19 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (11)
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Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.29 < 4.19.306 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.29 < 4.19.306" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.29 < 5.4.268 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.29 < 5.4.268" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.29 < 5.10.209 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.29 < 5.10.209" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.29 < 5.15.148 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.29 < 5.15.148" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.29 < 6.1.75 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.29 < 6.1.75" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.29 < 6.6.14 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.29 < 6.6.14" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.29 < 6.7.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.29 < 6.7.2" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.29 < 6.8 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.29 < 6.8" | en |
Affected
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