fkie_cve-2021-46927
Vulnerability from fkie_nvd
Published
2024-02-27 10:15
Modified
2024-11-21 06:34
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: nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert After commit 5b78ed24e8ec ("mm/pagemap: add mmap_assert_locked() annotations to find_vma*()"), the call to get_user_pages() will trigger the mmap assert. static inline void mmap_assert_locked(struct mm_struct *mm) { lockdep_assert_held(&mm->mmap_lock); VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm); } [ 62.521410] kernel BUG at include/linux/mmap_lock.h:156! ........................................................... [ 62.538938] RIP: 0010:find_vma+0x32/0x80 ........................................................... [ 62.605889] Call Trace: [ 62.608502] <TASK> [ 62.610956] ? lock_timer_base+0x61/0x80 [ 62.614106] find_extend_vma+0x19/0x80 [ 62.617195] __get_user_pages+0x9b/0x6a0 [ 62.620356] __gup_longterm_locked+0x42d/0x450 [ 62.623721] ? finish_wait+0x41/0x80 [ 62.626748] ? __kmalloc+0x178/0x2f0 [ 62.629768] ne_set_user_memory_region_ioctl.isra.0+0x225/0x6a0 [nitro_enclaves] [ 62.635776] ne_enclave_ioctl+0x1cf/0x6d7 [nitro_enclaves] [ 62.639541] __x64_sys_ioctl+0x82/0xb0 [ 62.642620] do_syscall_64+0x3b/0x90 [ 62.645642] entry_SYSCALL_64_after_hwframe+0x44/0xae Use get_user_pages_unlocked() when setting the enclave memory regions. That's a similar pattern as mmap_read_lock() used together with get_user_pages().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543Patch
Impacted products
Vendor Product Version
linux linux_kernel *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8CC64BCA-D219-487C-A123-4C470FE30AB2",
              "versionEndExcluding": "5.15.13",
              "versionStartIncluding": "5.15.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert\n\nAfter commit 5b78ed24e8ec (\"mm/pagemap: add mmap_assert_locked()\nannotations to find_vma*()\"), the call to get_user_pages() will trigger\nthe mmap assert.\n\nstatic inline void mmap_assert_locked(struct mm_struct *mm)\n{\n\tlockdep_assert_held(\u0026mm-\u003emmap_lock);\n\tVM_BUG_ON_MM(!rwsem_is_locked(\u0026mm-\u003emmap_lock), mm);\n}\n\n[   62.521410] kernel BUG at include/linux/mmap_lock.h:156!\n...........................................................\n[   62.538938] RIP: 0010:find_vma+0x32/0x80\n...........................................................\n[   62.605889] Call Trace:\n[   62.608502]  \u003cTASK\u003e\n[   62.610956]  ? lock_timer_base+0x61/0x80\n[   62.614106]  find_extend_vma+0x19/0x80\n[   62.617195]  __get_user_pages+0x9b/0x6a0\n[   62.620356]  __gup_longterm_locked+0x42d/0x450\n[   62.623721]  ? finish_wait+0x41/0x80\n[   62.626748]  ? __kmalloc+0x178/0x2f0\n[   62.629768]  ne_set_user_memory_region_ioctl.isra.0+0x225/0x6a0 [nitro_enclaves]\n[   62.635776]  ne_enclave_ioctl+0x1cf/0x6d7 [nitro_enclaves]\n[   62.639541]  __x64_sys_ioctl+0x82/0xb0\n[   62.642620]  do_syscall_64+0x3b/0x90\n[   62.645642]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nUse get_user_pages_unlocked() when setting the enclave memory regions.\nThat\u0027s a similar pattern as mmap_read_lock() used together with\nget_user_pages()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nitro_enclaves: use la llamada get_user_pages_unlocked() para manejar mmap afirmar. Despu\u00e9s del commit 5b78ed24e8ec (\"mm/pagemap: agregue anotaciones mmap_assert_locked() a find_vma*()\"), la llamada a get_user_pages( ) activar\u00e1 la afirmaci\u00f3n mmap. est\u00e1tico en l\u00ednea void mmap_assert_locked(struct mm_struct *mm) { lockdep_assert_held(\u0026amp;mm-\u0026gt;mmap_lock); VM_BUG_ON_MM(!rwsem_is_locked(\u0026amp;mm-\u0026gt;mmap_lock), mm); } [62.521410] \u00a1ERROR del kernel en include/linux/mmap_lock.h:156! ................................................. ......... [ 62.538938] RIP: 0010:find_vma+0x32/0x80 ................................. ................................. [ 62.605889] Seguimiento de llamadas: [ 62.608502]  [ 62.610956] ? LOCK_TIMER_BASE+0x61/0x80 [62.614106] find_extend_vma+0x19/0x80 [62.617195] __get_user_pages+0x9b/0x6a0 [62.6203356] __guup_longter_locked+0x42d/0x450 [62.620356] terminar_esperar+0x41/0x80 [62.626748]? __kmalloc+0x178/0x2f0 [ 62.629768] ne_set_user_memory_region_ioctl.isra.0+0x225/0x6a0 [nitro_enclaves] [ 62.635776] ne_enclave_ioctl+0x1cf/0x6d7 [nitro_enclaves] [ 62.639541] __x64 _sys_ioctl+0x82/0xb0 [ 62.642620] do_syscall_64+0x3b/0x90 [ 62.645642] Entry_SYSCALL_64_after_hwframe+0x44/0xae Utilice get_user_pages_unlocked() al configurar las regiones de memoria del enclave. Es un patr\u00f3n similar al mmap_read_lock() usado junto con get_user_pages()."
    }
  ],
  "id": "CVE-2021-46927",
  "lastModified": "2024-11-21T06:34:57.133",
  "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": "2024-02-27T10:15:07.410",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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