cve-2024-39483
Vulnerability from cvelistv5
Published
2024-07-05 06:55
Modified
2024-09-11 17:34
Severity ?
Summary
KVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1d87cf2eba46deaff6142366127f2323de9f84d1Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b4bd556467477420ee3a91fbcba73c579669edc6Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f79edaf7370986d73d204b36c50cc563a4c0f356Mailing List, Patch
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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                "id": "CVE-2024-39483",
                "options": [
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                    "Exploitation": "none"
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                    "Technical Impact": "partial"
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                "timestamp": "2024-09-10T17:07:35.709839Z",
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          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked\n\nWhen requesting an NMI window, WARN on vNMI support being enabled if and\nonly if NMIs are actually masked, i.e. if the vCPU is already handling an\nNMI.  KVM\u0027s ABI for NMIs that arrive simultanesouly (from KVM\u0027s point of\nview) is to inject one NMI and pend the other.  When using vNMI, KVM pends\nthe second NMI simply by setting V_NMI_PENDING, and lets the CPU do the\nrest (hardware automatically sets V_NMI_BLOCKING when an NMI is injected).\n\nHowever, if KVM can\u0027t immediately inject an NMI, e.g. because the vCPU is\nin an STI shadow or is running with GIF=0, then KVM will request an NMI\nwindow and trigger the WARN (but still function correctly).\n\nWhether or not the GIF=0 case makes sense is debatable, as the intent of\nKVM\u0027s behavior is to provide functionality that is as close to real\nhardware as possible.  E.g. if two NMIs are sent in quick succession, the\nprobability of both NMIs arriving in an STI shadow is infinitesimally low\non real hardware, but significantly larger in a virtual environment, e.g.\nif the vCPU is preempted in the STI shadow.  For GIF=0, the argument isn\u0027t\nas clear cut, because the window where two NMIs can collide is much larger\nin bare metal (though still small).\n\nThat said, KVM should not have divergent behavior for the GIF=0 case based\non whether or not vNMI support is enabled.  And KVM has allowed\nsimultaneous NMIs with GIF=0 for over a decade, since commit 7460fb4a3400\n(\"KVM: Fix simultaneous NMIs\").  I.e. KVM\u0027s GIF=0 handling shouldn\u0027t be\nmodified without a *really* good reason to do so, and if KVM\u0027s behavior\nwere to be modified, it should be done irrespective of vNMI support."
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    "datePublished": "2024-07-05T06:55:11.270Z",
    "dateReserved": "2024-06-25T14:23:23.747Z",
    "dateUpdated": "2024-09-11T17:34:41.168Z",
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La ABI de KVM para NMI que llegan simult\u00e1neamente (desde el punto de vista de KVM) es inyectar un NMI y esperar el otro. Cuando se usa vNMI, KVM suspende el segundo NMI simplemente configurando V_NMI_PENDING y deja que la CPU haga el resto (el hardware configura autom\u00e1ticamente V_NMI_BLOCKING cuando se inyecta un NMI). Sin embargo, si KVM no puede inyectar inmediatamente una NMI, por ejemplo, porque la vCPU est\u00e1 en una sombra STI o se est\u00e1 ejecutando con GIF=0, entonces KVM solicitar\u00e1 una ventana NMI y activar\u00e1 el WARN (pero seguir\u00e1 funcionando correctamente). Es discutible si el caso GIF=0 tiene sentido o no, ya que la intenci\u00f3n del comportamiento de KVM es proporcionar una funcionalidad lo m\u00e1s cercana posible al hardware real. 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}


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