In the Linux kernel, the following vulnerability has been resolved: soc: fsl: qbman: fix race condition in qman_destroy_fq When QMAN_FQ_FLAG_DYNAMIC_FQID is set, there's a race condition between fq_table[fq->idx] state and freeing/allocating from the pool and WARN_ON(fq_table[fq->idx]) in qman_create_fq() gets triggered. Indeed, we can have: Thread A Thread B qman_destroy_fq() qman_create_fq() qman_release_fqid() qman_shutdown_fq() gen_pool_free() -- At this point, the fqid is available again -- qman_alloc_fqid() -- so, we can get the just-freed fqid in thread B -- fq->fqid = fqid; fq->idx = fqid * 2; WARN_ON(fq_table[fq->idx]); fq_table[fq->idx] = fq; fq_table[fq->idx] = NULL; And adding some logs between qman_release_fqid() and fq_table[fq->idx] = NULL makes the WARN_ON() trigger a lot more. To prevent that, ensure that fq_table[fq->idx] is set to NULL before gen_pool_free() is called by using smp_wmb().
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: soc: fsl: qbman: corregir condición de carrera en qman_destroy_fq Cuando QMAN_FQ_FLAG_DYNAMIC_FQID está configurado, existe una condición de carrera entre el estado de fq_table[fq -> idx] y la liberación/asignación del pool, y WARN_ON(fq_table[fq -> idx]) en qman_create_fq() se activa. De hecho, podemos tener: Hilo A Hilo B qman_destroy_fq() qman_create_fq() qman_release_fqid() qman_shutdown_fq() gen_pool_free() -- En este punto, el fqid está disponible de nuevo -- qman_alloc_fqid() -- así, podemos obtener el fqid recién liberado en el hilo B -- fq -> fqid = fqid; fq -> idx = fqid * 2; WARN_ON(fq_table[fq -> idx]); fq_table[fq -> idx] = fq; fq_table[fq -> idx] = NULL; Y añadir algunos registros entre qman_release_fqid() y fq_table[fq -> idx] = NULL hace que el WARN_ON() se active mucho más. Para evitar eso, asegúrese de que fq_table[fq -> idx] se establezca a NULL antes de que se llame a gen_pool_free() usando smp_wmb().
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | HIGH |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | NONE |
| Integrity Impact | NONE |
| Availability Impact | HIGH |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-362
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2424504ec0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d24245069c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2424507040> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d239fbdfe40> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2424507a00> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2424506d80> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2357ccea40> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d2424506dc0> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d239fbddf40> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d2424507c80> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d2424504800> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* |