fkie_cve-2024-47717
Vulnerability from fkie_nvd
Published
2024-10-21 12:15
Modified
2024-10-24 14:32
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Don't zero-out PMU snapshot area before freeing data With the latest Linux-6.11-rc3, the below NULL pointer crash is observed when SBI PMU snapshot is enabled for the guest and the guest is forcefully powered-off. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000508 Oops [#1] Modules linked in: kvm CPU: 0 UID: 0 PID: 61 Comm: term-poll Not tainted 6.11.0-rc3-00018-g44d7178dd77a #3 Hardware name: riscv-virtio,qemu (DT) epc : __kvm_write_guest_page+0x94/0xa6 [kvm] ra : __kvm_write_guest_page+0x54/0xa6 [kvm] epc : ffffffff01590e98 ra : ffffffff01590e58 sp : ffff8f80001f39b0 gp : ffffffff81512a60 tp : ffffaf80024872c0 t0 : ffffaf800247e000 t1 : 00000000000007e0 t2 : 0000000000000000 s0 : ffff8f80001f39f0 s1 : 00007fff89ac4000 a0 : ffffffff015dd7e8 a1 : 0000000000000086 a2 : 0000000000000000 a3 : ffffaf8000000000 a4 : ffffaf80024882c0 a5 : 0000000000000000 a6 : ffffaf800328d780 a7 : 00000000000001cc s2 : ffffaf800197bd00 s3 : 00000000000828c4 s4 : ffffaf800248c000 s5 : ffffaf800247d000 s6 : 0000000000001000 s7 : 0000000000001000 s8 : 0000000000000000 s9 : 00007fff861fd500 s10: 0000000000000001 s11: 0000000000800000 t3 : 00000000000004d3 t4 : 00000000000004d3 t5 : ffffffff814126e0 t6 : ffffffff81412700 status: 0000000200000120 badaddr: 0000000000000508 cause: 000000000000000d [<ffffffff01590e98>] __kvm_write_guest_page+0x94/0xa6 [kvm] [<ffffffff015943a6>] kvm_vcpu_write_guest+0x56/0x90 [kvm] [<ffffffff015a175c>] kvm_pmu_clear_snapshot_area+0x42/0x7e [kvm] [<ffffffff015a1972>] kvm_riscv_vcpu_pmu_deinit.part.0+0xe0/0x14e [kvm] [<ffffffff015a2ad0>] kvm_riscv_vcpu_pmu_deinit+0x1a/0x24 [kvm] [<ffffffff0159b344>] kvm_arch_vcpu_destroy+0x28/0x4c [kvm] [<ffffffff0158e420>] kvm_destroy_vcpus+0x5a/0xda [kvm] [<ffffffff0159930c>] kvm_arch_destroy_vm+0x14/0x28 [kvm] [<ffffffff01593260>] kvm_destroy_vm+0x168/0x2a0 [kvm] [<ffffffff015933d4>] kvm_put_kvm+0x3c/0x58 [kvm] [<ffffffff01593412>] kvm_vm_release+0x22/0x2e [kvm] Clearly, the kvm_vcpu_write_guest() function is crashing because it is being called from kvm_pmu_clear_snapshot_area() upon guest tear down. To address the above issue, simplify the kvm_pmu_clear_snapshot_area() to not zero-out PMU snapshot area from kvm_pmu_clear_snapshot_area() because the guest is anyway being tore down. The kvm_pmu_clear_snapshot_area() is also called when guest changes PMU snapshot area of a VCPU but even in this case the previous PMU snaphsot area must not be zeroed-out because the guest might have reclaimed the pervious PMU snapshot area for some other purpose.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47d40d93292d9cff8dabb735bed83d930fa03950Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d0a5dcfc78bd18f2abb9641f83380135494559bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/81aa95fd5bd14ff49617f07fa79a8d1f1cf2ce9aPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "767D4D2D-C6E7-4B7D-9446-CFC8F8FF2FBB",
              "versionEndExcluding": "6.10.13",
              "versionStartIncluding": "6.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AB755D26-97F4-43B6-8604-CD076811E181",
              "versionEndExcluding": "6.11.2",
              "versionStartIncluding": "6.11",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Don\u0027t zero-out PMU snapshot area before freeing data\n\nWith the latest Linux-6.11-rc3, the below NULL pointer crash is observed\nwhen SBI PMU snapshot is enabled for the guest and the guest is forcefully\npowered-off.\n\n  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000508\n  Oops [#1]\n  Modules linked in: kvm\n  CPU: 0 UID: 0 PID: 61 Comm: term-poll Not tainted 6.11.0-rc3-00018-g44d7178dd77a #3\n  Hardware name: riscv-virtio,qemu (DT)\n  epc : __kvm_write_guest_page+0x94/0xa6 [kvm]\n   ra : __kvm_write_guest_page+0x54/0xa6 [kvm]\n  epc : ffffffff01590e98 ra : ffffffff01590e58 sp : ffff8f80001f39b0\n   gp : ffffffff81512a60 tp : ffffaf80024872c0 t0 : ffffaf800247e000\n   t1 : 00000000000007e0 t2 : 0000000000000000 s0 : ffff8f80001f39f0\n   s1 : 00007fff89ac4000 a0 : ffffffff015dd7e8 a1 : 0000000000000086\n   a2 : 0000000000000000 a3 : ffffaf8000000000 a4 : ffffaf80024882c0\n   a5 : 0000000000000000 a6 : ffffaf800328d780 a7 : 00000000000001cc\n   s2 : ffffaf800197bd00 s3 : 00000000000828c4 s4 : ffffaf800248c000\n   s5 : ffffaf800247d000 s6 : 0000000000001000 s7 : 0000000000001000\n   s8 : 0000000000000000 s9 : 00007fff861fd500 s10: 0000000000000001\n   s11: 0000000000800000 t3 : 00000000000004d3 t4 : 00000000000004d3\n   t5 : ffffffff814126e0 t6 : ffffffff81412700\n  status: 0000000200000120 badaddr: 0000000000000508 cause: 000000000000000d\n  [\u003cffffffff01590e98\u003e] __kvm_write_guest_page+0x94/0xa6 [kvm]\n  [\u003cffffffff015943a6\u003e] kvm_vcpu_write_guest+0x56/0x90 [kvm]\n  [\u003cffffffff015a175c\u003e] kvm_pmu_clear_snapshot_area+0x42/0x7e [kvm]\n  [\u003cffffffff015a1972\u003e] kvm_riscv_vcpu_pmu_deinit.part.0+0xe0/0x14e [kvm]\n  [\u003cffffffff015a2ad0\u003e] kvm_riscv_vcpu_pmu_deinit+0x1a/0x24 [kvm]\n  [\u003cffffffff0159b344\u003e] kvm_arch_vcpu_destroy+0x28/0x4c [kvm]\n  [\u003cffffffff0158e420\u003e] kvm_destroy_vcpus+0x5a/0xda [kvm]\n  [\u003cffffffff0159930c\u003e] kvm_arch_destroy_vm+0x14/0x28 [kvm]\n  [\u003cffffffff01593260\u003e] kvm_destroy_vm+0x168/0x2a0 [kvm]\n  [\u003cffffffff015933d4\u003e] kvm_put_kvm+0x3c/0x58 [kvm]\n  [\u003cffffffff01593412\u003e] kvm_vm_release+0x22/0x2e [kvm]\n\nClearly, the kvm_vcpu_write_guest() function is crashing because it is\nbeing called from kvm_pmu_clear_snapshot_area() upon guest tear down.\n\nTo address the above issue, simplify the kvm_pmu_clear_snapshot_area() to\nnot zero-out PMU snapshot area from kvm_pmu_clear_snapshot_area() because\nthe guest is anyway being tore down.\n\nThe kvm_pmu_clear_snapshot_area() is also called when guest changes\nPMU snapshot area of a VCPU but even in this case the previous PMU\nsnaphsot area must not be zeroed-out because the guest might have\nreclaimed the pervious PMU snapshot area for some other purpose."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: RISC-V: KVM: No ponga a cero el \u00e1rea de instant\u00e1neas de PMU antes de liberar los datos. Con la \u00faltima versi\u00f3n Linux-6.11-rc3, se observa el siguiente bloqueo del puntero NULL cuando la instant\u00e1nea de SBI PMU est\u00e1 habilitada para el invitado y el invitado se apaga a la fuerza. No se puede manejar la desreferencia del puntero NULL del n\u00facleo en la direcci\u00f3n virtual 0000000000000508 Ups [#1] M\u00f3dulos vinculados: kvm CPU: 0 UID: 0 PID: 61 Comm: term-poll No contaminado 6.11.0-rc3-00018-g44d7178dd77a #3 Nombre del hardware: riscv-virtio,qemu (DT) epc : __kvm_write_guest_page+0x94/0xa6 [kvm] ra : __kvm_write_guest_page+0x54/0xa6 [kvm] epc : ffffffff01590e98 ra : ffffffff01590e58 sp : ffff8f80001f39b0 gp : ffffffff81512a60 tp: ffffaf80024872c0 t0: ffffaf800247e000 t1: 00000000000007e0 t2: 00000000000000000 s0: ffff8f80001f39f0 s1: 00007fff89ac40 00 a0: ffffffff015dd7e8 a1: 0000000000000086 a2: 0000000000000000 a3: ffffaf8000000000 a4: ffffaf80024882c0 a5: 0000000000000000 a6: ffffaf800328d780 a7: 00000000000001cc s2: ffffaf800197bd00 s3: 00000000000828c4 s4: ffffaf800248c000 s5: 7d000 s6: 0000000000001000 s7: 0000000000001000 s8: 0000000000000000 s9: 00007fff861fd500 s10: 0000000000000001 s11: 0000000000800000 t3 : 00000000000004d3 t4 : 000000000000004d3 t5 : ffffffff814126e0 t6 : ffffffff81412700 estado: 0000000200000120 direcci\u00f3n incorrecta: 0000000000000508 causa: 000000000000000d [] __kvm_write_guest_page+0x94/0xa6 [kvm] [] kvm_vcpu_write_guest+0x56/0x90 [kvm] [] kvm_pmu_clear_snapshot_area+0x42/0x7e [kvm] [] kvm_riscv_vcpu_pmu_deinit.part.0+0xe0/0x14e [kvm] [] kvm_riscv_vcpu_pmu_deinit+0x1a/0x24 [kvm] [] kvm_arch_vcpu_destroy+0x28/0x4c [kvm] [] kvm_destroy_vcpus+0x5a/0xda [kvm] [] kvm_arch_destroy_vm+0x14/0x28 [kvm] [] kvm_destroy_vm+0x168/0x2a0 [kvm] [] kvm_put_kvm+0x3c/0x58 [kvm] [] kvm_vm_release+0x22/0x2e [kvm] Claramente, la funci\u00f3n kvm_vcpu_write_guest() falla porque se la llama desde kvm_pmu_clear_snapshot_area() al desmantelar el invitado. Para solucionar el problema anterior, simplifique kvm_pmu_clear_snapshot_area() para que no ponga a cero el \u00e1rea de instant\u00e1neas de PMU de kvm_pmu_clear_snapshot_area() porque, de todos modos, el invitado se est\u00e1 desmantelando. Tambi\u00e9n se llama a kvm_pmu_clear_snapshot_area() cuando el invitado cambia el \u00e1rea de instant\u00e1neas de PMU de una VCPU, pero incluso en este caso, el \u00e1rea de instant\u00e1neas de PMU anterior no debe ponerse a cero porque el invitado podr\u00eda haber recuperado el \u00e1rea de instant\u00e1neas de PMU anterior para alg\u00fan otro prop\u00f3sito."
    }
  ],
  "id": "CVE-2024-47717",
  "lastModified": "2024-10-24T14:32:20.817",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-10-21T12:15:08.020",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/47d40d93292d9cff8dabb735bed83d930fa03950"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6d0a5dcfc78bd18f2abb9641f83380135494559b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/81aa95fd5bd14ff49617f07fa79a8d1f1cf2ce9a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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