CVE-2022-49296

{"id": "CVE-2022-49296", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2025-02-26T07:01:06.433", "references": [{"url": "https://git.kernel.org/stable/c/292b7a7275ce535a1abfa4dd0b2e586162aaae1e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/825978fd6a0defc3c29d8a38b6cea76a0938d21e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-667"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix possible deadlock when holding Fwb to get inline_data\n\n1, mount with wsync.\n2, create a file with O_RDWR, and the request was sent to mds.0:\n\n ceph_atomic_open()-->\n ceph_mdsc_do_request(openc)\n finish_open(file, dentry, ceph_open)-->\n ceph_open()-->\n ceph_init_file()-->\n ceph_init_file_info()-->\n ceph_uninline_data()-->\n {\n ...\n if (inline_version == 1 || /* initial version, no data */\n inline_version == CEPH_INLINE_NONE)\n goto out_unlock;\n ...\n }\n\nThe inline_version will be 1, which is the initial version for the\nnew create file. And here the ci->i_inline_version will keep with 1,\nit's buggy.\n\n3, buffer write to the file immediately:\n\n ceph_write_iter()-->\n ceph_get_caps(file, need=Fw, want=Fb, ...);\n generic_perform_write()-->\n a_ops->write_begin()-->\n ceph_write_begin()-->\n netfs_write_begin()-->\n netfs_begin_read()-->\n netfs_rreq_submit_slice()-->\n netfs_read_from_server()-->\n rreq->netfs_ops->issue_read()-->\n ceph_netfs_issue_read()-->\n {\n ...\n if (ci->i_inline_version != CEPH_INLINE_NONE &&\n ceph_netfs_issue_op_inline(subreq))\n return;\n ...\n }\n ceph_put_cap_refs(ci, Fwb);\n\nThe ceph_netfs_issue_op_inline() will send a getattr(Fsr) request to\nmds.1.\n\n4, then the mds.1 will request the rd lock for CInode::filelock from\nthe auth mds.0, the mds.0 will do the CInode::filelock state transation\nfrom excl --> sync, but it need to revoke the Fxwb caps back from the\nclients.\n\nWhile the kernel client has aleady held the Fwb caps and waiting for\nthe getattr(Fsr).\n\nIt's deadlock!\n\nURL: https://tracker.ceph.com/issues/55377"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ceph: se corrige un posible bloqueo al mantener presionado Fwb para obtener inline_data 1, montar con wsync. 2, crear un archivo con O_RDWR y la solicitud se envi\u00f3 a mds.0: ceph_atomic_open()--> ceph_mdsc_do_request(openc) finish_open(file, dentry, ceph_open)--> ceph_open()--> ceph_init_file()--> ceph_init_file_info()--> ceph_uninline_data()--> { ... if (inline_version == 1 || /* versi\u00f3n inicial, sin datos */ inline_version == CEPH_INLINE_NONE) goto out_unlock; ... } La inline_version ser\u00e1 1, que es la versi\u00f3n inicial para el nuevo archivo de creaci\u00f3n. Y aqu\u00ed, ci->i_inline_version se mantendr\u00e1 con 1, es un error. 3, escribe en el b\u00fafer inmediatamente en el archivo: ceph_write_iter()--> ceph_get_caps(archivo, necesidad=Fw, deseo=Fb, ...); generic_perform_write()--> a_ops->write_begin()--> ceph_write_begin()--> netfs_write_begin()--> netfs_begin_read()--> netfs_rreq_submit_slice()--> netfs_read_from_server()--> rreq->netfs_ops->issue_read()--> ceph_netfs_issue_read()--> { ... if (ci->i_inline_version != CEPH_INLINE_NONE && ceph_netfs_issue_op_inline(subreq)) return; ... } ceph_put_cap_refs(ci, Fwb); El ceph_netfs_issue_op_inline() enviar\u00e1 una solicitud getattr(Fsr) a mds.1.4, luego mds.1 solicitar\u00e1 el bloqueo de rd para CInode::filelock desde el mds.0 de autenticaci\u00f3n, el mds.0 realizar\u00e1 la transacci\u00f3n de estado de CInode::filelock desde excl --> sync, pero necesita revocar las capacidades Fxwb de los clientes. Mientras que el cliente del kernel ya ha retenido las capacidades Fwb y est\u00e1 esperando el getattr(Fsr). \u00a1Est\u00e1 en un punto muerto! URL: https://tracker.ceph.com/issues/55377"}], "lastModified": "2025-04-14T20:08:21.310", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "48912B8B-BDF1-422C-9CA5-2DDFDBAADC80", "versionEndExcluding": "5.18.4", "versionStartIncluding": "2.6.34"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}