mirror of
https://github.com/fkie-cad/nvd-json-data-feeds.git
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183 lines
11 KiB
JSON
183 lines
11 KiB
JSON
{
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"id": "CVE-2024-44952",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"published": "2024-09-04T19:15:30.213",
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"lastModified": "2024-09-06T16:37:38.370",
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"vulnStatus": "Analyzed",
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"cveTags": [],
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: Fix uevent_show() vs driver detach race\n\nuevent_show() wants to de-reference dev->driver->name. There is no clean\nway for a device attribute to de-reference dev->driver unless that\nattribute is defined via (struct device_driver).dev_groups. Instead, the\nanti-pattern of taking the device_lock() in the attribute handler risks\ndeadlocks with code paths that remove device attributes while holding\nthe lock.\n\nThis deadlock is typically invisible to lockdep given the device_lock()\nis marked lockdep_set_novalidate_class(), but some subsystems allocate a\nlocal lockdep key for @dev->mutex to reveal reports of the form:\n\n ======================================================\n WARNING: possible circular locking dependency detected\n 6.10.0-rc7+ #275 Tainted: G OE N\n ------------------------------------------------------\n modprobe/2374 is trying to acquire lock:\n ffff8c2270070de0 (kn->active#6){++++}-{0:0}, at: __kernfs_remove+0xde/0x220\n\n but task is already holding lock:\n ffff8c22016e88f8 (&cxl_root_key){+.+.}-{3:3}, at: device_release_driver_internal+0x39/0x210\n\n which lock already depends on the new lock.\n\n the existing dependency chain (in reverse order) is:\n\n -> #1 (&cxl_root_key){+.+.}-{3:3}:\n __mutex_lock+0x99/0xc30\n uevent_show+0xac/0x130\n dev_attr_show+0x18/0x40\n sysfs_kf_seq_show+0xac/0xf0\n seq_read_iter+0x110/0x450\n vfs_read+0x25b/0x340\n ksys_read+0x67/0xf0\n do_syscall_64+0x75/0x190\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n -> #0 (kn->active#6){++++}-{0:0}:\n __lock_acquire+0x121a/0x1fa0\n lock_acquire+0xd6/0x2e0\n kernfs_drain+0x1e9/0x200\n __kernfs_remove+0xde/0x220\n kernfs_remove_by_name_ns+0x5e/0xa0\n device_del+0x168/0x410\n device_unregister+0x13/0x60\n devres_release_all+0xb8/0x110\n device_unbind_cleanup+0xe/0x70\n device_release_driver_internal+0x1c7/0x210\n driver_detach+0x47/0x90\n bus_remove_driver+0x6c/0xf0\n cxl_acpi_exit+0xc/0x11 [cxl_acpi]\n __do_sys_delete_module.isra.0+0x181/0x260\n do_syscall_64+0x75/0x190\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe observation though is that driver objects are typically much longer\nlived than device objects. It is reasonable to perform lockless\nde-reference of a @driver pointer even if it is racing detach from a\ndevice. Given the infrequency of driver unregistration, use\nsynchronize_rcu() in module_remove_driver() to close any potential\nraces. It is potentially overkill to suffer synchronize_rcu() just to\nhandle the rare module removal racing uevent_show() event.\n\nThanks to Tetsuo Handa for the debug analysis of the syzbot report [1]."
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},
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{
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"lang": "es",
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: n\u00facleo del controlador: se corrige uevent_show() frente a la ejecuci\u00f3n de desconexi\u00f3n del controlador uevent_show() quiere desreferenciar dev->driver->name. No hay una forma clara de que un atributo de dispositivo desreferenciar dev->driver a menos que ese atributo se defina mediante (struct device_driver).dev_groups. En cambio, el antipatr\u00f3n de tomar device_lock() en el controlador de atributos corre el riesgo de bloqueos con rutas de c\u00f3digo que eliminan los atributos del dispositivo mientras mantienen el bloqueo. Este interbloqueo es t\u00edpicamente invisible para lockdep dado que device_lock() est\u00e1 marcado como lockdep_set_novalidate_class(), pero algunos subsistemas asignan una clave lockdep local para que @dev->mutex revele informes del formato: ======================================================== ADVERTENCIA: posible dependencia de bloqueo circular detectada 6.10.0-rc7+ #275 Tainted: G OE N ------------------------------------------------------ modprobe/2374 est\u00e1 intentando adquirir el bloqueo: ffff8c2270070de0 (kn->active#6){++++}-{0:0}, en: __kernfs_remove+0xde/0x220 pero la tarea ya tiene el bloqueo: ffff8c22016e88f8 (&cxl_root_key){+.+.}-{3:3}, en: device_release_driver_internal+0x39/0x210 cuyo bloqueo ya depende del nuevo bloqueo. la cadena de dependencia existente (en orden inverso) es: -> #1 (&cxl_root_key){+.+.}-{3:3}: __mutex_lock+0x99/0xc30 uevent_show+0xac/0x130 dev_attr_show+0x18/0x40 sysfs_kf_seq_show+0xac/0xf0 seq_read_iter+0x110/0x450 vfs_read+0x25b/0x340 ksys_read+0x67/0xf0 do_syscall_64+0x75/0x190 entry_SYSCALL_64_after_hwframe+0x76/0x7e -> #0 (kn->active#6){++++}-{0:0}: __lock_acquire+0x121a/0x1fa0 lock_acquire+0xd6/0x2e0 kernfs_drain+0x1e9/0x200 __kernfs_remove+0xde/0x220 kernfs_remove_by_name_ns+0x5e/0xa0 device_del+0x168/0x410 device_unregister+0x13/0x60 devres_release_all+0xb8/0x110 device_unbind_cleanup+0xe/0x70 device_release_driver_internal+0x1c7/0x210 driver_detach+0x47/0x90 bus_remove_driver+0x6c/0xf0 cxl_acpi_exit+0xc/0x11 [cxl_acpi] __do_sys_delete_module.isra.0+0x181/0x260 do_syscall_64+0x75/0x190 entry_SYSCALL_64_after_hwframe+0x76/0x7e Sin embargo, la observaci\u00f3n es que los objetos de controlador suelen tener una vida \u00fatil mucho m\u00e1s larga que los objetos de dispositivo. Es razonable realizar una desreferencia sin bloqueo de un puntero @driver incluso si est\u00e1 compitiendo por desconectarse de un dispositivo. Dada la poca frecuencia de anulaci\u00f3n del registro de un controlador, usesynchronous_rcu() en module_remove_driver() para cerrar cualquier ejecuci\u00f3n potencial. Es potencialmente excesivo sufrirsynchronous_rcu() solo para manejar el raro evento uevent_show() de ejecuci\u00f3n de eliminaci\u00f3n de m\u00f3dulo. Gracias a Tetsuo Handa por el an\u00e1lisis de depuraci\u00f3n del informe de syzbot [1]."
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}
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],
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"metrics": {
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"cvssMetricV31": [
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{
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"source": "nvd@nist.gov",
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"type": "Primary",
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"cvssData": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"attackVector": "LOCAL",
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"attackComplexity": "LOW",
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"privilegesRequired": "LOW",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "HIGH",
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"baseScore": 5.5,
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"baseSeverity": "MEDIUM"
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},
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"exploitabilityScore": 1.8,
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"impactScore": 3.6
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}
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]
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},
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"weaknesses": [
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{
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"source": "nvd@nist.gov",
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"type": "Primary",
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"description": [
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{
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"lang": "en",
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"value": "CWE-667"
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}
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]
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}
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],
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"configurations": [
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