CVE-2022-50045
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
powerpc/pci: Fix get_phb_number() locking
The recent change to get_phb_number() causes a DEBUG_ATOMIC_SLEEP warning on some systems:
This is because pcibios_alloc_controller() holds hose_spinlock but of_alias_get_id() takes of_mutex which can sleep.
The hose_spinlock protects the phb_bitmap, and also the hose_list, but it doesn't need to be held while get_phb_number() calls the OF routines, because those are only looking up information in the device tree.
So fix it by having get_phb_number() take the hose_spinlock itself, only where required, and then dropping the lock before returning. pcibios_alloc_controller() then needs to take the lock again before the list_add() but that's safe, the order of the list is not important.
Detalles técnicos trazas, registros y código del informe original
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
1 lock held by swapper/1:
#0: c157efb0 (hose_spinlock){+.+.}-{2:2}, at: pcibios_alloc_controller+0x64/0x220
Preemption disabled at:
[<00000000>] 0x0
CPU: 0 PID: 1 Comm: swapper Not tainted 5.19.0-yocto-standard+ #1
Call Trace:
[d101dc90] [c073b264] dump_stack_lvl+0x50/0x8c (unreliable)
[d101dcb0] [c0093b70] __might_resched+0x258/0x2a8
[d101dcd0] [c0d3e634] __mutex_lock+0x6c/0x6ec
[d101dd50] [c0a84174] of_alias_get_id+0x50/0xf4
[d101dd80] [c002ec78] pcibios_alloc_controller+0x1b8/0x220
[d101ddd0] [c140c9dc] pmac_pci_init+0x198/0x784
[d101de50] [c140852c] discover_phbs+0x30/0x4c
[d101de60] [c0007fd4] do_one_initcall+0x94/0x344
[d101ded0] [c1403b40] kernel_init_freeable+0x1a8/0x22c
[d101df10] [c00086e0] kernel_init+0x34/0x160
[d101df30] [c001b334] ret_from_kernel_thread+0x5c/0x64CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.14%
- Percentil entre todas las CVEs puntuadas: 3
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-667
Referencias
- https://git.kernel.org/stable/c/1d9e75c3d8cdf7c96a94cb77450d4ee070279e6a
- https://git.kernel.org/stable/c/5db5ce0f1963c6c8275719a80cb65e9c98d32726
- https://git.kernel.org/stable/c/6f75057c21eab12c6ccb7f06f859641a6edfab99
- https://git.kernel.org/stable/c/8d48562a2729742f767b0fdd994d6b2a56a49c63
- https://git.kernel.org/stable/c/90f195c01a2e8d8da6281791617e21109719c981
- https://git.kernel.org/stable/c/a868f771ee41c97a25a04b8c632a7f06689b307b
- https://git.kernel.org/stable/c/ccb0a42d3f40c436295e0fef57ab613ae5b925a4
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pci: Fix get_phb_number() locking\n\nThe recent change to get_phb_number() causes a DEBUG_ATOMIC_SLEEP\nwarning on some systems:\n\n BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580\n in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper\n preempt_count: 1, expected: 0\n RCU nest depth: 0, expected: 0\n 1 lock held by swapper/1:\n #0: c157efb0 (hose_spinlock){+.+.}-{2:2}, at: pcibios_alloc_controller+0x64/0x220\n Preemption disabled at:\n [<00000000>] 0x0\n CPU: 0 PID: 1 Comm: swapper Not tainted 5.19.0-yocto-standard+ #1\n Call Trace:\n [d101dc90] [c073b264] dump_stack_lvl+0x50/0x8c (unreliable)\n [d101dcb0] [c0093b70] __might_resched+0x258/0x2a8\n [d101dcd0] [c0d3e634] __mutex_lock+0x6c/0x6ec\n [d101dd50] [c0a84174] of_alias_get_id+0x50/0xf4\n [d101dd80] [c002ec78] pcibios_alloc_controller+0x1b8/0x220\n [d101ddd0] [c140c9dc] pmac_pci_init+0x198/0x784\n [d101de50] [c140852c] discover_phbs+0x30/0x4c\n [d101de60] [c0007fd4] do_one_initcall+0x94/0x344\n [d101ded0] [c1403b40] kernel_init_freeable+0x1a8/0x22c\n [d101df10] [c00086e0] kernel_init+0x34/0x160\n [d101df30] [c001b334] ret_from_kernel_thread+0x5c/0x64\n\nThis is because pcibios_alloc_controller() holds hose_spinlock but\nof_alias_get_id() takes of_mutex which can sleep.\n\nThe hose_spinlock protects the phb_bitmap, and also the hose_list, but\nit doesn't need to be held while get_phb_number() calls the OF routines,\nbecause those are only looking up information in the device tree.\n\nSo fix it by having get_phb_number() take the hose_spinlock itself, only\nwhere required, and then dropping the lock before returning.\npcibios_alloc_controller() then needs to take the lock again before the\nlist_add() but that's safe, the order of the list is not important."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc/pci: Se corrige el bloqueo de get_phb_number() El cambio reciente en get_phb_number() provoca una advertencia DEBUG_ATOMIC_SLEEP en algunos sistemas: ERROR: función de suspensión llamada desde un contexto no válido en kernel/locking/mutex.c:580 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper preempt_count: 1, expected: 0 Profundidad de anidamiento de RCU: 0, expected: 0 1 bloqueo mantenido por swapper/1: #0: c157efb0 (hose_spinlock){+.+.}-{2:2}, en: pcibios_alloc_controller+0x64/0x220 Preempción deshabilitada en: [<00000000>] 0x0 CPU: 0 PID: 1 Comm: swapper No contaminado 5.19.0-yocto-standard+ #1 Seguimiento de llamadas: [d101dc90] [c073b264] dump_stack_lvl+0x50/0x8c (no confiable) [d101dcb0] [c0093b70] __might_resched+0x258/0x2a8 [d101dcd0] [c0d3e634] __mutex_lock+0x6c/0x6ec [d101dd50] [c0a84174] of_alias_get_id+0x50/0xf4 [d101dd80] [c002ec78] pcibios_alloc_controller+0x1b8/0x220 [d101ddd0] [c140c9dc] pmac_pci_init+0x198/0x784 [d101de50] [c140852c] discover_phbs+0x30/0x4c [d101de60] [c0007fd4] do_one_initcall+0x94/0x344 [d101ded0] [c1403b40] kernel_init_freeable+0x1a8/0x22c [d101df10] [c00086e0] kernel_init+0x34/0x160 [d101df30] [c001b334] ret_from_kernel_thread+0x5c/0x64 Esto se debe a que pcibios_alloc_controller() mantiene hose_spinlock pero of_alias_get_id() toma of_mutex que puede dormir. El hose_spinlock protege phb_bitmap y también hose_list, pero no es necesario mantenerlo mientras get_phb_number() llama a las rutinas OF, ya que estas solo buscan información en el árbol de dispositivos. Para solucionarlo, haga que get_phb_number() tome el hose_spinlock solo cuando sea necesario y luego desactive el bloqueo antes de regresar. pcibios_alloc_controller() debe volver a tomar el bloqueo antes de list_add(), pero esto es seguro; el orden de la lista no importa."
}
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"lastModified": "2026-06-17T05:22:37.923",
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