cve-2021-47412
Vulnerability from cvelistv5
Published
2024-05-21 15:04
Modified
2024-11-04 12:05
Severity ?
EPSS score ?
Summary
block: don't call rq_qos_ops->done_bio if the bio isn't tracked
References
Impacted products
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: don\u0027t call rq_qos_ops-\u003edone_bio if the bio isn\u0027t tracked\n\nrq_qos framework is only applied on request based driver, so:\n\n1) rq_qos_done_bio() needn\u0027t to be called for bio based driver\n\n2) rq_qos_done_bio() needn\u0027t to be called for bio which isn\u0027t tracked,\nsuch as bios ended from error handling code.\n\nEspecially in bio_endio():\n\n1) request queue is referred via bio-\u003ebi_bdev-\u003ebd_disk-\u003equeue, which\nmay be gone since request queue refcount may not be held in above two\ncases\n\n2) q-\u003erq_qos may be freed in blk_cleanup_queue() when calling into\n__rq_qos_done_bio()\n\nFix the potential kernel panic by not calling rq_qos_ops-\u003edone_bio if\nthe bio isn\u0027t tracked. This way is safe because both ioc_rqos_done_bio()\nand blkcg_iolatency_done_bio() are nop if the bio isn\u0027t tracked."
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"title": "block: don\u0027t call rq_qos_ops-\u003edone_bio if the bio isn\u0027t tracked",
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"nvd": "{\"cve\":{\"id\":\"CVE-2021-47412\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:26.700\",\"lastModified\":\"2024-11-21T06:36:05.480\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nblock: don\u0027t call rq_qos_ops-\u003edone_bio if the bio isn\u0027t tracked\\n\\nrq_qos framework is only applied on request based driver, so:\\n\\n1) rq_qos_done_bio() needn\u0027t to be called for bio based driver\\n\\n2) rq_qos_done_bio() needn\u0027t to be called for bio which isn\u0027t tracked,\\nsuch as bios ended from error handling code.\\n\\nEspecially in bio_endio():\\n\\n1) request queue is referred via bio-\u003ebi_bdev-\u003ebd_disk-\u003equeue, which\\nmay be gone since request queue refcount may not be held in above two\\ncases\\n\\n2) q-\u003erq_qos may be freed in blk_cleanup_queue() when calling into\\n__rq_qos_done_bio()\\n\\nFix the potential kernel panic by not calling rq_qos_ops-\u003edone_bio if\\nthe bio isn\u0027t tracked. This way is safe because both ioc_rqos_done_bio()\\nand blkcg_iolatency_done_bio() are nop if the bio isn\u0027t tracked.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bloque: no llame a rq_qos_ops-\u0026gt;done_bio si no se realiza un seguimiento de la biograf\u00eda. El framework rq_qos solo se aplica en el controlador basado en solicitudes, por lo que: 1) rq_qos_done_bio() no necesita hacerlo ser llamado para un controlador basado en biograf\u00eda 2) No es necesario llamar a rq_qos_done_bio() para una biograf\u00eda que no est\u00e1 rastreada, como una biograf\u00eda terminada por un c\u00f3digo de manejo de errores. Especialmente en bio_endio(): 1) la cola de solicitudes se remite a trav\u00e9s de bio-\u0026gt;bi_bdev-\u0026gt;bd_disk-\u0026gt;queue, que puede desaparecer ya que el recuento de la cola de solicitudes no se puede mantener en los dos casos anteriores 2) q-\u0026gt;rq_qos se puede liberar en blk_cleanup_queue() al llamar a __rq_qos_done_bio() Solucione el posible p\u00e1nico del kernel al no llamar a rq_qos_ops-\u0026gt;done_bio si no se realiza un seguimiento de la biograf\u00eda. Esta forma es segura porque tanto ioc_rqos_done_bio() como blkcg_iolatency_done_bio() no funcionan si no se realiza un seguimiento de la biograf\u00eda.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/004b8f8a691205a93d9e80d98b786b2b97424d6e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/a647a524a46736786c95cdb553a070322ca096e3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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