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Algunos controladores requieren memoria marcada como datos de servicios de arranque de EFI. Para que el kernel no reutilice esta memoria despu\u00e9s de ExitBootServices(), se utiliza efi_mem_reserve() para preservarla insertando un nuevo descriptor de memoria EFI y marc\u00e1ndolo con el atributo EFI_MEMORY_RUNTIME. En SEV, la memoria marcada con el atributo EFI_MEMORY_RUNTIME debe ser asignada cifrada por Linux; de lo contrario, el kernel podr\u00eda fallar en el arranque como se muestra a continuaci\u00f3n: EFI Variables Facility v0.08 2004-May-17 falla de protecci\u00f3n general, probablemente para la direcci\u00f3n no can\u00f3nica 0x3597688770a868b2: 0000 [#1] SMP NOPTI CPU: 13 PID: 1 Comm: swapper/0 No contaminado 5.12.4-2-default #1 openSUSE Tumbleweed Nombre del hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 0.0.0 02 /06/2015 RIP: 0010:efi_mokvar_entry_next [...] Seguimiento de llamadas: efi_mokvar_sysfs_init? efi_mokvar_table_init do_one_initcall? __kmalloc kernel_init_freeable? rest_init kernel_init ret_from_fork Expanda la funci\u00f3n __ioremap_check_other() para verificar adicionalmente este otro tipo de datos de arranque reservados en tiempo de ejecuci\u00f3n e indicar que deben asignarse cifrados para un invitado SEV. [pb: mensaje de confirmaci\u00f3n de masaje. ]"}], "id": "CVE-2021-47228", "lastModified": "2025-04-29T19:49:34.467", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-05-21T15:15:12.250", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: x86/ioremap: Map EFI-reserved memory as encrypted for SEV", "id": "2282589", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282589"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nx86/ioremap: Map EFI-reserved memory as encrypted for SEV\nSome drivers require memory that is marked as EFI boot services\ndata. In order for this memory to not be re-used by the kernel\nafter ExitBootServices(), efi_mem_reserve() is used to preserve it\nby inserting a new EFI memory descriptor and marking it with the\nEFI_MEMORY_RUNTIME attribute.\nUnder SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to\nbe mapped encrypted by Linux, otherwise the kernel might crash at boot\nlike below:\nEFI Variables Facility v0.08 2004-May-17\ngeneral protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI\nCPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\nRIP: 0010:efi_mokvar_entry_next\n[...]\nCall Trace:\nefi_mokvar_sysfs_init\n? efi_mokvar_table_init\ndo_one_initcall\n? __kmalloc\nkernel_init_freeable\n? rest_init\nkernel_init\nret_from_fork\nExpand the __ioremap_check_other() function to additionally check for\nthis other type of boot data reserved at runtime and indicate that it\nshould be mapped encrypted for an SEV guest.\n[ bp: Massage commit message. ]"], "name": "CVE-2021-47228", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47228\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47228\nhttps://lore.kernel.org/linux-cve-announce/2024052137-CVE-2021-47228-415f@gregkh/T"], "threat_severity": "Low"}

{}