fkie_cve-2022-50149
Vulnerability from fkie_nvd
Published
2025-06-18 11:15
Modified
2025-06-18 13:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: driver core: fix potential deadlock in __driver_attach In __driver_attach function, There are also AA deadlock problem, like the commit b232b02bf3c2 ("driver core: fix deadlock in __device_attach"). stack like commit b232b02bf3c2 ("driver core: fix deadlock in __device_attach"). list below: In __driver_attach function, The lock holding logic is as follows: ... __driver_attach if (driver_allows_async_probing(drv)) device_lock(dev) // get lock dev async_schedule_dev(__driver_attach_async_helper, dev); // func async_schedule_node async_schedule_node_domain(func) entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC); /* when fail or work limit, sync to execute func, but __driver_attach_async_helper will get lock dev as will, which will lead to A-A deadlock. */ if (!entry || atomic_read(&entry_count) > MAX_WORK) { func; else queue_work_node(node, system_unbound_wq, &entry->work) device_unlock(dev) As above show, when it is allowed to do async probes, because of out of memory or work limit, async work is not be allowed, to do sync execute instead. it will lead to A-A deadlock because of __driver_attach_async_helper getting lock dev. Reproduce: and it can be reproduce by make the condition (if (!entry || atomic_read(&entry_count) > MAX_WORK)) untenable, like below: [ 370.785650] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 370.787154] task:swapper/0 state:D stack: 0 pid: 1 ppid: 0 flags:0x00004000 [ 370.788865] Call Trace: [ 370.789374] <TASK> [ 370.789841] __schedule+0x482/0x1050 [ 370.790613] schedule+0x92/0x1a0 [ 370.791290] schedule_preempt_disabled+0x2c/0x50 [ 370.792256] __mutex_lock.isra.0+0x757/0xec0 [ 370.793158] __mutex_lock_slowpath+0x1f/0x30 [ 370.794079] mutex_lock+0x50/0x60 [ 370.794795] __device_driver_lock+0x2f/0x70 [ 370.795677] ? driver_probe_device+0xd0/0xd0 [ 370.796576] __driver_attach_async_helper+0x1d/0xd0 [ 370.797318] ? driver_probe_device+0xd0/0xd0 [ 370.797957] async_schedule_node_domain+0xa5/0xc0 [ 370.798652] async_schedule_node+0x19/0x30 [ 370.799243] __driver_attach+0x246/0x290 [ 370.799828] ? driver_allows_async_probing+0xa0/0xa0 [ 370.800548] bus_for_each_dev+0x9d/0x130 [ 370.801132] driver_attach+0x22/0x30 [ 370.801666] bus_add_driver+0x290/0x340 [ 370.802246] driver_register+0x88/0x140 [ 370.802817] ? virtio_scsi_init+0x116/0x116 [ 370.803425] scsi_register_driver+0x1a/0x30 [ 370.804057] init_sd+0x184/0x226 [ 370.804533] do_one_initcall+0x71/0x3a0 [ 370.805107] kernel_init_freeable+0x39a/0x43a [ 370.805759] ? rest_init+0x150/0x150 [ 370.806283] kernel_init+0x26/0x230 [ 370.806799] ret_from_fork+0x1f/0x30 To fix the deadlock, move the async_schedule_dev outside device_lock, as we can see, in async_schedule_node_domain, the parameter of queue_work_node is system_unbound_wq, so it can accept concurrent operations. which will also not change the code logic, and will not lead to deadlock.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37f908038402c9b8325763f306a1c65d88757e15
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70fe758352cafdee72a7b13bf9db065f9613ced8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/733ab0c19bf17f6ad7c2b580ede006e369d5ab1b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/779b634714c51d05baaeff4868ce2fd9fc7399bf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8191b6cd9ada09b675f17446d5872eb1f77685cb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a93f33aeef4e6a94ae9c9d3f5b2f9085ad0572ec
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: fix potential deadlock in __driver_attach\n\nIn __driver_attach function, There are also AA deadlock problem,\nlike the commit b232b02bf3c2 (\"driver core: fix deadlock in\n__device_attach\").\n\nstack like commit b232b02bf3c2 (\"driver core: fix deadlock in\n__device_attach\").\nlist below:\n    In __driver_attach function, The lock holding logic is as follows:\n    ...\n    __driver_attach\n    if (driver_allows_async_probing(drv))\n      device_lock(dev)      // get lock dev\n        async_schedule_dev(__driver_attach_async_helper, dev); // func\n          async_schedule_node\n            async_schedule_node_domain(func)\n              entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC);\n              /* when fail or work limit, sync to execute func, but\n                 __driver_attach_async_helper will get lock dev as\n                 will, which will lead to A-A deadlock.  */\n              if (!entry || atomic_read(\u0026entry_count) \u003e MAX_WORK) {\n                func;\n              else\n                queue_work_node(node, system_unbound_wq, \u0026entry-\u003ework)\n      device_unlock(dev)\n\n    As above show, when it is allowed to do async probes, because of\n    out of memory or work limit, async work is not be allowed, to do\n    sync execute instead. it will lead to A-A deadlock because of\n    __driver_attach_async_helper getting lock dev.\n\nReproduce:\nand it can be reproduce by make the condition\n(if (!entry || atomic_read(\u0026entry_count) \u003e MAX_WORK)) untenable, like\nbelow:\n\n[  370.785650] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables\nthis message.\n[  370.787154] task:swapper/0       state:D stack:    0 pid:    1 ppid:\n0 flags:0x00004000\n[  370.788865] Call Trace:\n[  370.789374]  \u003cTASK\u003e\n[  370.789841]  __schedule+0x482/0x1050\n[  370.790613]  schedule+0x92/0x1a0\n[  370.791290]  schedule_preempt_disabled+0x2c/0x50\n[  370.792256]  __mutex_lock.isra.0+0x757/0xec0\n[  370.793158]  __mutex_lock_slowpath+0x1f/0x30\n[  370.794079]  mutex_lock+0x50/0x60\n[  370.794795]  __device_driver_lock+0x2f/0x70\n[  370.795677]  ? driver_probe_device+0xd0/0xd0\n[  370.796576]  __driver_attach_async_helper+0x1d/0xd0\n[  370.797318]  ? driver_probe_device+0xd0/0xd0\n[  370.797957]  async_schedule_node_domain+0xa5/0xc0\n[  370.798652]  async_schedule_node+0x19/0x30\n[  370.799243]  __driver_attach+0x246/0x290\n[  370.799828]  ? driver_allows_async_probing+0xa0/0xa0\n[  370.800548]  bus_for_each_dev+0x9d/0x130\n[  370.801132]  driver_attach+0x22/0x30\n[  370.801666]  bus_add_driver+0x290/0x340\n[  370.802246]  driver_register+0x88/0x140\n[  370.802817]  ? virtio_scsi_init+0x116/0x116\n[  370.803425]  scsi_register_driver+0x1a/0x30\n[  370.804057]  init_sd+0x184/0x226\n[  370.804533]  do_one_initcall+0x71/0x3a0\n[  370.805107]  kernel_init_freeable+0x39a/0x43a\n[  370.805759]  ? rest_init+0x150/0x150\n[  370.806283]  kernel_init+0x26/0x230\n[  370.806799]  ret_from_fork+0x1f/0x30\n\nTo fix the deadlock, move the async_schedule_dev outside device_lock,\nas we can see, in async_schedule_node_domain, the parameter of\nqueue_work_node is system_unbound_wq, so it can accept concurrent\noperations. which will also not change the code logic, and will\nnot lead to deadlock."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: n\u00facleo del controlador: corrige un posible bloqueo en __driver_attach En la funci\u00f3n __driver_attach, tambi\u00e9n hay un problema de bloqueo AA, como el commit b232b02bf3c2 (\"n\u00facleo del controlador: corrige el bloqueo en __device_attach\"). pila como el commit b232b02bf3c2 (\"n\u00facleo del controlador: corrige el bloqueo en __device_attach\"). lista a continuaci\u00f3n: En la funci\u00f3n __driver_attach, la l\u00f3gica de retenci\u00f3n de bloqueo es la siguiente: ... __driver_attach if (driver_allows_async_probing(drv)) device_lock(dev) // obtener bloqueo dev async_schedule_dev(__driver_attach_async_helper, dev); // func async_schedule_node async_schedule_node_domain(func) entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC); /* cuando falla o hay l\u00edmite de trabajo, se sincroniza para ejecutar func, pero __driver_attach_async_helper obtendr\u00e1 el bloqueo dev, lo que provocar\u00e1 un bloqueo AA. */ if (!entry || atomic_read(\u0026amp;entry_count) \u0026gt; MAX_WORK) { func; else queue_work_node(node, system_unbound_wq, \u0026amp;entry-\u0026gt;work) device_unlock(dev) Como se muestra arriba, cuando se permite hacer sondeos asincr\u00f3nicos, debido a falta de memoria o l\u00edmite de trabajo, no se permite el trabajo asincr\u00f3nico, en su lugar se ejecuta la sincronizaci\u00f3n. Esto provocar\u00e1 un bloqueo AA debido a que __driver_attach_async_helper obtiene el bloqueo dev. Reproducir: y se puede reproducir haciendo que la condici\u00f3n (if (!entry || atomic_read(\u0026amp;entry_count) \u0026gt; MAX_WORK)) sea insostenible, como se muestra a continuaci\u00f3n: [ 370.785650] \"echo 0 \u0026gt; /proc/sys/kernel/hung_task_timeout_secs\" deshabilita este mensaje. [ 370.787154] tarea:swapper/0 estado:D pila: 0 pid: 1 ppid: 0 indicadores:0x00004000 [ 370.788865] Seguimiento de llamadas: [ 370.789374]  [ 370.789841] __schedule+0x482/0x1050 [ 370.790613] schedule+0x92/0x1a0 [ 370.791290] schedule_preempt_disabled+0x2c/0x50 [ 370.792256] __mutex_lock.isra.0+0x757/0xec0 [ 370.793158] __mutex_lock_slowpath+0x1f/0x30 [ 370.794079] mutex_lock+0x50/0x60 [ 370.794795] __device_driver_lock+0x2f/0x70 [ 370.795677] ? driver_probe_device+0xd0/0xd0 [ 370.796576] __driver_attach_async_helper+0x1d/0xd0 [ 370.797318] ? driver_probe_device+0xd0/0xd0 [ 370.797957] async_schedule_node_domain+0xa5/0xc0 [ 370.798652] async_schedule_node+0x19/0x30 [ 370.799243] __driver_attach+0x246/0x290 [ 370.799828] ? driver_allows_async_probing+0xa0/0xa0 [ 370.800548] bus_for_each_dev+0x9d/0x130 [ 370.801132] driver_attach+0x22/0x30 [ 370.801666] bus_add_driver+0x290/0x340 [ 370.802246] driver_register+0x88/0x140 [ 370.802817] ? virtio_scsi_init+0x116/0x116 [ 370.803425] scsi_register_driver+0x1a/0x30 [ 370.804057] init_sd+0x184/0x226 [ 370.804533] do_one_initcall+0x71/0x3a0 [ 370.805107] kernel_init_freeable+0x39a/0x43a [ 370.805759] ? rest_init+0x150/0x150 [ 370.806283] kernel_init+0x26/0x230 [ 370.806799] ret_from_fork+0x1f/0x30 Para corregir el bloqueo, mueva async_schedule_dev fuera de device_lock, como podemos ver, en async_schedule_node_domain, el par\u00e1metro de queue_work_node es system_unbound_wq, por lo que puede aceptar operaciones concurrentes, lo que tampoco cambiar\u00e1 la l\u00f3gica del c\u00f3digo y no conducir\u00e1 a un bloqueo."
    }
  ],
  "id": "CVE-2022-50149",
  "lastModified": "2025-06-18T13:47:40.833",
  "metrics": {},
  "published": "2025-06-18T11:15:44.963",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/37f908038402c9b8325763f306a1c65d88757e15"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70fe758352cafdee72a7b13bf9db065f9613ced8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/733ab0c19bf17f6ad7c2b580ede006e369d5ab1b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/779b634714c51d05baaeff4868ce2fd9fc7399bf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8191b6cd9ada09b675f17446d5872eb1f77685cb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a93f33aeef4e6a94ae9c9d3f5b2f9085ad0572ec"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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