CVE-2021-46927
Vulnerability from cvelistv5
Published
2024-02-27 09:43
Modified
2024-11-04 11:56
Severity ?
Summary
nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543Patch
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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                "id": "CVE-2021-46927",
                "options": [
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                    "Exploitation": "none"
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                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-02-27T15:46:16.994467Z",
                "version": "2.0.3"
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          "dateUpdated": "2024-07-05T17:22:00.781Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:17:42.860Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543"
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            "url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176"
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        "title": "CVE Program Container"
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    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/virt/nitro_enclaves/ne_misc_dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "90d2beed5e75",
              "status": "affected",
              "version": "5b78ed24e8ec",
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              "status": "affected",
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          "vendor": "Linux",
          "versions": [
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              "version": "5.15"
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          "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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-04T11:56:04.090Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543"
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          "url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176"
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      ],
      "title": "nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert",
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        "engine": "bippy-9e1c9544281a"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-46927",
    "datePublished": "2024-02-27T09:43:56.743Z",
    "dateReserved": "2024-02-25T13:45:52.720Z",
    "dateUpdated": "2024-11-04T11:56:04.090Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46927\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T10:15:07.410\",\"lastModified\":\"2024-04-10T16:25:32.067\",\"vulnStatus\":\"Analyzed\",\"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().\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.0\",\"versionEndExcluding\":\"5.15.13\",\"matchCriteriaId\":\"8CC64BCA-D219-487C-A123-4C470FE30AB2\"}]}]}],\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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