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Vulnerability Change Records for CVE-2024-44952

Change History

CVE Translated by kernel.org 11/09/2024 5:15:04 AM

Action Type Old Value New Value
Removed Translation
Title: kernel de Linux
Description: En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: núcleo del controlador: se corrige uevent_show() frente a la ejecución de desconexión 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 antipatrón de tomar device_lock() en el controlador de atributos corre el riesgo de bloqueos con rutas de código que eliminan los atributos del dispositivo mientras mantienen el bloqueo. Este interbloqueo es típicamente invisible para lockdep dado que device_lock() está 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 está 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 observación es que los objetos de controlador suelen tener una vida útil mucho más larga que los objetos de dispositivo. Es razonable realizar una desreferencia sin bloqueo de un puntero @driver incluso si está compitiendo por desconectarse de un dispositivo. Dada la poca frecuencia de anulación del registro de un controlador, usesynchronous_rcu() en module_remove_driver() para cerrar cualquier ejecución potencial. Es potencialmente excesivo sufrirsynchronous_rcu() solo para manejar el raro evento uevent_show() de ejecución de eliminación de módulo. Gracias a Tetsuo Handa por el análisis de depuración del informe de syzbot [1].

								
						

CVE Modified by kernel.org 11/09/2024 5:15:04 AM

Action Type Old Value New Value
Changed Description
In the Linux kernel, the following vulnerability has been resolved:

driver core: Fix uevent_show() vs driver detach race

uevent_show() wants to de-reference dev->driver->name. There is no clean
way for a device attribute to de-reference dev->driver unless that
attribute is defined via (struct device_driver).dev_groups. Instead, the
anti-pattern of taking the device_lock() in the attribute handler risks
deadlocks with code paths that remove device attributes while holding
the lock.

This deadlock is typically invisible to lockdep given the device_lock()
is marked lockdep_set_novalidate_class(), but some subsystems allocate a
local lockdep key for @dev->mutex to reveal reports of the form:

 ======================================================
 WARNING: possible circular locking dependency detected
 6.10.0-rc7+ #275 Tainted: G           OE    N
 ------------------------------------------------------
 modprobe/2374 is trying to acquire lock:
 ffff8c2270070de0 (kn->active#6){++++}-{0:0}, at: __kernfs_remove+0xde/0x220

 but task is already holding lock:
 ffff8c22016e88f8 (&cxl_root_key){+.+.}-{3:3}, at: device_release_driver_internal+0x39/0x210

 which lock already depends on the new lock.

 the existing dependency chain (in reverse order) is:

 -> #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

The observation though is that driver objects are typically much longer
lived than device objects. It is reasonable to perform lockless
de-reference of a @driver pointer even if it is racing detach from a
device. Given the infrequency of driver unregistration, use
synchronize_rcu() in module_remove_driver() to close any potential
races.  It is potentially overkill to suffer synchronize_rcu() just to
handle the rare module removal racing uevent_show() event.

Thanks to Tetsuo Handa for the debug analysis of the syzbot report [1].
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
Removed CVSS V3.1
NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

								
						
Removed CWE
NIST CWE-667

								
						
Removed CPE Configuration
OR
     
          *cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*
          *cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.10 from (excluding) 6.10.5
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.35 from (excluding) 6.6.46
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.1.95 from (excluding) 6.1.105
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.15.162 from (excluding) 5.15.165
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10.221 from (excluding) 5.10.224
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.4.279 from (excluding) 5.4.282
          *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.19.317 from (excluding) 4.19.320

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/15fffc6a5624b13b428bb1c6e9088e32a55eb82c

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/1cfc329304617838dc06f021bbbde3bc79cd655e

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/4749d336170dbb629e515a857e58a82e61c37a9c

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/49ea4e0d862632d51667da5e7a9c88a560e9c5a1

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/4a7c2a8387524942171037e70b80e969c3b5c05b

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/4d035c743c3e391728a6f81cbf0f7f9ca700cf62

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/92d847a35e1e41bceba13b8ac1f0e1b9dbe30d25

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/9c23fc327d6ec67629b4ad323bd64d3834c0417d

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/cd490a247ddf325325fd0de8898659400c9237ef

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/cfc72b86fa20cbf44d2b6cc27b35eb15080232ab

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/d4dba9a076838f3d0333a6a66efec2cdda90b2ee

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/dd98c9630b7ee273da87e9a244f94ddf947161e2

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/f098e8fc7227166206256c18d56ab622039108b1

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/fd28d9589460945985ef5333e9b942c4261f0826

								
						
Removed Reference
kernel.org https://git.kernel.org/stable/c/fe10c8367687c27172a10ba5cc849bd82077bd7d

								
						

CVE Rejected by kernel.org 11/09/2024 5:15:04 AM

Action Type Old Value New Value