fkie_cve-2024-57945
Vulnerability from fkie_nvd
Published
2025-01-21 13:15
Modified
2025-09-26 19:10
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: mm: Fix the out of bound issue of vmemmap address In sparse vmemmap model, the virtual address of vmemmap is calculated as: ((struct page *)VMEMMAP_START - (phys_ram_base >> PAGE_SHIFT)). And the struct page's va can be calculated with an offset: (vmemmap + (pfn)). However, when initializing struct pages, kernel actually starts from the first page from the same section that phys_ram_base belongs to. If the first page's physical address is not (phys_ram_base >> PAGE_SHIFT), then we get an va below VMEMMAP_START when calculating va for it's struct page. For example, if phys_ram_base starts from 0x82000000 with pfn 0x82000, the first page in the same section is actually pfn 0x80000. During init_unavailable_range(), we will initialize struct page for pfn 0x80000 with virtual address ((struct page *)VMEMMAP_START - 0x2000), which is below VMEMMAP_START as well as PCI_IO_END. This commit fixes this bug by introducing a new variable 'vmemmap_start_pfn' which is aligned with memory section size and using it to calculate vmemmap address instead of phys_ram_base.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92f08673d3f1893191323572f60e3c62f2e57c2fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4a7ac3d266008018f05fae53060fcb331151a14Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2bd51954ac8377c2f1eb1813e694788998add66Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f754f27e98f88428aaf6be6e00f5cbce97f62d4bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.8
linux linux_kernel 6.8
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13


To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: mm: Fix the out of bound issue of vmemmap address\n\nIn sparse vmemmap model, the virtual address of vmemmap is calculated as:\n((struct page *)VMEMMAP_START - (phys_ram_base \u003e\u003e PAGE_SHIFT)).\nAnd the struct page\u0027s va can be calculated with an offset:\n(vmemmap + (pfn)).\n\nHowever, when initializing struct pages, kernel actually starts from the\nfirst page from the same section that phys_ram_base belongs to. If the\nfirst page\u0027s physical address is not (phys_ram_base \u003e\u003e PAGE_SHIFT), then\nwe get an va below VMEMMAP_START when calculating va for it\u0027s struct page.\n\nFor example, if phys_ram_base starts from 0x82000000 with pfn 0x82000, the\nfirst page in the same section is actually pfn 0x80000. During\ninit_unavailable_range(), we will initialize struct page for pfn 0x80000\nwith virtual address ((struct page *)VMEMMAP_START - 0x2000), which is\nbelow VMEMMAP_START as well as PCI_IO_END.\n\nThis commit fixes this bug by introducing a new variable\n\u0027vmemmap_start_pfn\u0027 which is aligned with memory section size and using\nit to calculate vmemmap address instead of phys_ram_base."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: riscv: mm: Corrige el problema de salida de l\u00edmites de la direcci\u00f3n vmemmap En el modelo vmemmap disperso, la direcci\u00f3n virtual de vmemmap se calcula como: ((struct page *)VMEMMAP_START - (phys_ram_base \u0026gt;\u0026gt; PAGE_SHIFT)). Y la va de la p\u00e1gina de estructura se puede calcular con un desplazamiento: (vmemmap + (pfn)). Sin embargo, al inicializar las p\u00e1ginas de estructura, el kernel en realidad comienza desde la primera p\u00e1gina de la misma secci\u00f3n a la que pertenece phys_ram_base. Si la direcci\u00f3n f\u00edsica de la primera p\u00e1gina no es (phys_ram_base \u0026gt;\u0026gt; PAGE_SHIFT), obtenemos una va por debajo de VMEMMAP_START al calcular la va para su p\u00e1gina de estructura. Por ejemplo, si phys_ram_base comienza desde 0x82000000 con pfn 0x82000, la primera p\u00e1gina en la misma secci\u00f3n es en realidad pfn 0x80000. Durante init_unavailable_range(), inicializaremos struct page para pfn 0x80000 con direcci\u00f3n virtual ((struct page *)VMEMMAP_START - 0x2000), que est\u00e1 debajo de VMEMMAP_START y PCI_IO_END. Esta confirmaci\u00f3n corrige este error al introducir una nueva variable \u0027vmemmap_start_pfn\u0027 que est\u00e1 alineada con el tama\u00f1o de la secci\u00f3n de memoria y la usa para calcular la direcci\u00f3n vmemmap en lugar de phys_ram_base."
    }
  ],
  "id": "CVE-2024-57945",
  "lastModified": "2025-09-26T19:10:18.507",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  },
  "published": "2025-01-21T13:15:09.033",
  "references": [
    {
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      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
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}


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