cve-2024-42293
Vulnerability from cvelistv5
Published
2024-08-17 09:09
Modified
2024-12-19 09:15
Severity ?
Summary
arm64: mm: Fix lockless walks with static and dynamic page-table folding
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/36639013b3462c06ff8e3400a427f775b4fc97f5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78672d49d3eebbcda3589f4d6e589caf357c5a59
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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{
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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-42293",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:10:57.009784Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2024-09-12T17:33:29.368Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/pgtable.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "78672d49d3eebbcda3589f4d6e589caf357c5a59",
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              "version": "0dd4f60a2c76938c2625f6c630c225699d97608b",
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/pgtable.h"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.9"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "6.10.3",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.11",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: Fix lockless walks with static and dynamic page-table folding\n\nLina reports random oopsen originating from the fast GUP code when\n16K pages are used with 4-level page-tables, the fourth level being\nfolded at runtime due to lack of LPA2.\n\nIn this configuration, the generic implementation of\np4d_offset_lockless() will return a \u0027p4d_t *\u0027 corresponding to the\n\u0027pgd_t\u0027 allocated on the stack of the caller, gup_fast_pgd_range().\nThis is normally fine, but when the fourth level of page-table is folded\nat runtime, pud_offset_lockless() will offset from the address of the\n\u0027p4d_t\u0027 to calculate the address of the PUD in the same page-table page.\nThis results in a stray stack read when the \u0027p4d_t\u0027 has been allocated\non the stack and can send the walker into the weeds.\n\nFix the problem by providing our own definition of p4d_offset_lockless()\nwhen CONFIG_PGTABLE_LEVELS \u003c= 4 which returns the real page-table\npointer rather than the address of the local stack variable."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:15:47.868Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/78672d49d3eebbcda3589f4d6e589caf357c5a59"
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        {
          "url": "https://git.kernel.org/stable/c/36639013b3462c06ff8e3400a427f775b4fc97f5"
        }
      ],
      "title": "arm64: mm: Fix lockless walks with static and dynamic page-table folding",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-42293",
    "datePublished": "2024-08-17T09:09:02.303Z",
    "dateReserved": "2024-07-30T07:40:12.268Z",
    "dateUpdated": "2024-12-19T09:15:47.868Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-42293\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-17T09:15:09.867\",\"lastModified\":\"2024-08-19T12:59:59.177\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64: mm: Fix lockless walks with static and dynamic page-table folding\\n\\nLina reports random oopsen originating from the fast GUP code when\\n16K pages are used with 4-level page-tables, the fourth level being\\nfolded at runtime due to lack of LPA2.\\n\\nIn this configuration, the generic implementation of\\np4d_offset_lockless() will return a \u0027p4d_t *\u0027 corresponding to the\\n\u0027pgd_t\u0027 allocated on the stack of the caller, gup_fast_pgd_range().\\nThis is normally fine, but when the fourth level of page-table is folded\\nat runtime, pud_offset_lockless() will offset from the address of the\\n\u0027p4d_t\u0027 to calculate the address of the PUD in the same page-table page.\\nThis results in a stray stack read when the \u0027p4d_t\u0027 has been allocated\\non the stack and can send the walker into the weeds.\\n\\nFix the problem by providing our own definition of p4d_offset_lockless()\\nwhen CONFIG_PGTABLE_LEVELS \u003c= 4 which returns the real page-table\\npointer rather than the address of the local stack variable.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: mm: corrige recorridos sin bloqueo con plegado de tablas de p\u00e1ginas est\u00e1ticas y din\u00e1micas. Lina informa oopsen aleatorios que se originan en el c\u00f3digo GUP r\u00e1pido cuando se utilizan p\u00e1ginas de 16 KB con tablas de p\u00e1ginas de 4 niveles. el cuarto nivel se pliega en tiempo de ejecuci\u00f3n debido a la falta de LPA2. En esta configuraci\u00f3n, la implementaci\u00f3n gen\u00e9rica de p4d_offset_lockless() devolver\u00e1 un \u0027p4d_t *\u0027 correspondiente al \u0027pgd_t\u0027 asignado en la pila de la persona que llama, gup_fast_pgd_range(). Esto normalmente est\u00e1 bien, pero cuando el cuarto nivel de la tabla de p\u00e1ginas se pliega en tiempo de ejecuci\u00f3n, pud_offset_lockless() se desplazar\u00e1 de la direcci\u00f3n de \u0027p4d_t\u0027 para calcular la direcci\u00f3n del PUD en la misma p\u00e1gina de la tabla de p\u00e1ginas. Esto da como resultado una lectura de pila perdida cuando el \u0027p4d_t\u0027 se ha asignado en la pila y puede enviar al caminante hacia la maleza. Solucione el problema proporcionando nuestra propia definici\u00f3n de p4d_offset_lockless() cuando CONFIG_PGTABLE_LEVELS \u0026lt;= 4, que devuelve el puntero de la tabla de p\u00e1ginas real en lugar de la direcci\u00f3n de la variable de pila local.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/36639013b3462c06ff8e3400a427f775b4fc97f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78672d49d3eebbcda3589f4d6e589caf357c5a59\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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