CVE-2024-38664

drm: zynqmp_dpsub: Always register bridge

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

drm: zynqmp_dpsub: Always register bridge

We must always register the DRM bridge, since zynqmp_dp_hpd_work_func
calls drm_bridge_hpd_notify, which in turn expects hpd_mutex to be
initialized. We do this before zynqmp_dpsub_drm_init since that calls
drm_bridge_attach. This fixes the following lockdep warning:

[ 19.217084] ------------[ cut here ]------------
[ 19.227530] DEBUG_LOCKS_WARN_ON(lock->magic != lock)
[ 19.227768] WARNING: CPU: 0 PID: 140 at kernel/locking/mutex.c:582 __mutex_lock+0x4bc/0x550
[ 19.241696] Modules linked in:
[ 19.244937] CPU: 0 PID: 140 Comm: kworker/0:4 Not tainted 6.6.20+ #96
[ 19.252046] Hardware name: xlnx,zynqmp (DT)
[ 19.256421] Workqueue: events zynqmp_dp_hpd_work_func
[ 19.261795] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 19.269104] pc : __mutex_lock+0x4bc/0x550
[ 19.273364] lr : __mutex_lock+0x4bc/0x550
[ 19.277592] sp : ffffffc085c5bbe0
[ 19.281066] x29: ffffffc085c5bbe0 x28: 0000000000000000 x27: ffffff88009417f8
[ 19.288624] x26: ffffff8800941788 x25: ffffff8800020008 x24: ffffffc082aa3000
[ 19.296227] x23: ffffffc080d90e3c x22: 0000000000000002 x21: 0000000000000000
[ 19.303744] x20: 0000000000000000 x19: ffffff88002f5210 x18: 0000000000000000
[ 19.311295] x17: 6c707369642e3030 x16: 3030613464662072 x15: 0720072007200720
[ 19.318922] x14: 0000000000000000 x13: 284e4f5f4e524157 x12: 0000000000000001
[ 19.326442] x11: 0001ffc085c5b940 x10: 0001ff88003f388b x9 : 0001ff88003f3888
[ 19.334003] x8 : 0001ff88003f3888 x7 : 0000000000000000 x6 : 0000000000000000
[ 19.341537] x5 : 0000000000000000 x4 : 0000000000001668 x3 : 0000000000000000
[ 19.349054] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff88003f3880
[ 19.356581] Call trace:
[ 19.359160] __mutex_lock+0x4bc/0x550
[ 19.363032] mutex_lock_nested+0x24/0x30
[ 19.367187] drm_bridge_hpd_notify+0x2c/0x6c
[ 19.371698] zynqmp_dp_hpd_work_func+0x44/0x54
[ 19.376364] process_one_work+0x3ac/0x988
[ 19.380660] worker_thread+0x398/0x694
[ 19.384736] kthread+0x1bc/0x1c0
[ 19.388241] ret_from_fork+0x10/0x20
[ 19.392031] irq event stamp: 183
[ 19.395450] hardirqs last enabled at (183): [<ffffffc0800b9278>] finish_task_switch.isra.0+0xa8/0x2d4
[ 19.405140] hardirqs last disabled at (182): [<ffffffc081ad3754>] __schedule+0x714/0xd04
[ 19.413612] softirqs last enabled at (114): [<ffffffc080133de8>] srcu_invoke_callbacks+0x158/0x23c
[ 19.423128] softirqs last disabled at (110): [<ffffffc080133de8>] srcu_invoke_callbacks+0x158/0x23c
[ 19.432614] ---[ end trace 0000000000000000 ]---

(cherry picked from commit 61ba791c4a7a09a370c45b70a81b8c7d4cf6b2ae)

En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: drm: zynqmp_dpsub: Registrar siempre puente Siempre debemos registrar el puente DRM, ya que zynqmp_dp_hpd_work_func llama a drm_bridge_hpd_notify, que a su vez espera que hpd_mutex se inicialice. Hacemos esto antes de zynqmp_dpsub_drm_init ya que llama a drm_bridge_attach. Esto corrige la siguiente advertencia de bloqueo: [19.217084] ------------[ cortar aquí ]------------ [ 19.227530] DEBUG_LOCKS_WARN_ON(lock->magic != lock ) [ 19.227768] ADVERTENCIA: CPU: 0 PID: 140 en kernel/locking/mutex.c:582 __mutex_lock+0x4bc/0x550 [ 19.241696] Módulos vinculados en: [ 19.244937] CPU: 0 PID: 140 Comm: kworker/0:4 No contaminado 6.6.20+ #96 [19.252046] Nombre de hardware: xlnx,zynqmp (DT) [19.256421] Cola de trabajo: eventos zynqmp_dp_hpd_work_func [19.261795] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS PE=-- ) [ 19.269104] pc : __mutex_lock+0x4bc/0x550 [ 19.273364] lr : __mutex_lock+0x4bc/0x550 [ 19.277592] sp : ffffffc085c5bbe0 [ 19.281066] x29: ffffffc085c5bbe0 8: 0000000000000000 x27: ffffff88009417f8 [ 19.288624] x26: ffffff8800941788 x25: ffffff8800020008 x24: ffffffc082aa3000 [ 19.296227] x23: ffffffc080d90e3c x22: 0000000000000002 x21: 00000000000000000 [ 19.303744] x20: 0000000000000000 x19: ffffff88002f5210 x18: 0000000000000000 [ 19.311295] x17: 6c707369642e3030 x16: 3030613464662072 x15: 0720072007200720 [ 19.318922] 4: 0000000000000000 x13: 284e4f5f4e524157 x12: 0000000000000001 [ 19.326442] x11: 0001ffc085c5b940 x10: 0001ff88003f388b x9: 0001ff88003f3888 [19.334003] x8: 0001ff88003f3888 x7: 0000000000000000 x6 : 0000000000000000 [ 19.341537] x5 : 0000000000000000 x4 : 0000000000001668 x3 : 0000000000000000 [ 19.349054] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff88003f3880 [ 19.356581] Seguimiento de llamadas: [ 19.359160] __mutex_lock+0x4bc/0x550 [ 19.363032] mutex_lock_nested+0x24/0x30 [ 19.367187] drm_bridge_hpd_notify+0x2c/0x6c [ zynqmp_dp_hpd_work_func +0x44/0x54 [ 19.376364] proceso_un_trabajo+0x3ac/0x988 [ 19.380660] hilo_trabajador+0x398/ 0x694 [19.384736] kthread+0x1bc/0x1c0 [19.388241] ret_from_fork+0x10/0x20 [19.392031] sello de evento irq: 183 [19.395450] hardirqs habilitado por última vez en (183): [] terminar_task_switch.isra.0+0xa8/0x2d4 [ 19.405140] hardirqs deshabilitado por última vez en (182): [] __schedule+0x714/0xd04 [ 19.413612] softirqs habilitado por última vez en (114): [] srcu_invoke_callbacks+0x158/0x23c 19.423128] softirqs se deshabilitó por última vez en ( 110): [] srcu_invoke_callbacks+0x158/0x23c [ 19.432614] ---[ end trace 0000000000000000 ]--- (seleccionado de el commit 61ba791c4a7a09a370c45b70a81b8c7d4 cf6b2ae)

*Credits: N/A

CVSS Scores

NISTv3.1 7.8

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-06-21 CVE Reserved
2024-06-24 CVE Published
2024-06-27 EPSS Updated
2024-08-02 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-667: Improper Locking

CAPEC

References (4)

URL	Tag	Source
https://git.kernel.org/stable/c/eb2d64bfcc174919a921295a5327b99a3b8f4166	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/6ead3eccf67bc8318b1ce95ed879b2cc05b4fce9	2024-06-12
https://git.kernel.org/stable/c/603661357056b5e5ba6d86f505fbc936eff396ba	2024-06-12
https://git.kernel.org/stable/c/be3f3042391d061cfca2bd22630e0d101acea5fc	2024-05-02

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.2 < 6.6.33 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.2 < 6.6.33"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.2 < 6.9.4 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.2 < 6.9.4"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 6.2 < 6.10 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.2 < 6.10"		en		Affected