cve-2021-47492
Vulnerability from cvelistv5
Published
2024-05-22 08:19
Modified
2024-11-04 12:06
Severity ?
Summary
mm, thp: bail out early in collapse_file for writeback page
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5e669d8ab30ab61dec3c36e27b4711f07611e6fc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/69a7fa5cb0de06c8956b040f19a7248c8c8308ca
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74c42e1baacf206338b1dd6b6199ac964512b5bb
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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                "id": "CVE-2021-47492",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
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                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-05-22T19:45:29.189112Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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          "dateUpdated": "2024-08-04T05:39:59.622Z",
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        "title": "CVE Program Container"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/khugepaged.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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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": "5.4"
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              "version": "0",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm, thp: bail out early in collapse_file for writeback page\n\nCurrently collapse_file does not explicitly check PG_writeback, instead,\npage_has_private and try_to_release_page are used to filter writeback\npages.  This does not work for xfs with blocksize equal to or larger\nthan pagesize, because in such case xfs has no page-\u003eprivate.\n\nThis makes collapse_file bail out early for writeback page.  Otherwise,\nxfs end_page_writeback will panic as follows.\n\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:ffff0003f88c86a8 index:0x0 pfn:0x84ef32\n  aops:xfs_address_space_operations [xfs] ino:30000b7 dentry name:\"libtest.so\"\n  flags: 0x57fffe0000008027(locked|referenced|uptodate|active|writeback)\n  raw: 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8\n  raw: 0000000000000000 0000000000000000 00000000ffffffff ffff0000c3e9a000\n  page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u \u003c= 127u))\n  page-\u003emem_cgroup:ffff0000c3e9a000\n  ------------[ cut here ]------------\n  kernel BUG at include/linux/mm.h:1212!\n  Internal error: Oops - BUG: 0 [#1] SMP\n  Modules linked in:\n  BUG: Bad page state in process khugepaged  pfn:84ef32\n   xfs(E)\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:0 index:0x0 pfn:0x84ef32\n   libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ...\n  CPU: 25 PID: 0 Comm: swapper/25 Kdump: loaded Tainted: ...\n  pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)\n  Call trace:\n    end_page_writeback+0x1c0/0x214\n    iomap_finish_page_writeback+0x13c/0x204\n    iomap_finish_ioend+0xe8/0x19c\n    iomap_writepage_end_bio+0x38/0x50\n    bio_endio+0x168/0x1ec\n    blk_update_request+0x278/0x3f0\n    blk_mq_end_request+0x34/0x15c\n    virtblk_request_done+0x38/0x74 [virtio_blk]\n    blk_done_softirq+0xc4/0x110\n    __do_softirq+0x128/0x38c\n    __irq_exit_rcu+0x118/0x150\n    irq_exit+0x1c/0x30\n    __handle_domain_irq+0x8c/0xf0\n    gic_handle_irq+0x84/0x108\n    el1_irq+0xcc/0x180\n    arch_cpu_idle+0x18/0x40\n    default_idle_call+0x4c/0x1a0\n    cpuidle_idle_call+0x168/0x1e0\n    do_idle+0xb4/0x104\n    cpu_startup_entry+0x30/0x9c\n    secondary_start_kernel+0x104/0x180\n  Code: d4210000 b0006161 910c8021 94013f4d (d4210000)\n  ---[ end trace 4a88c6a074082f8c ]---\n  Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt"
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        "dateUpdated": "2024-11-04T12:06:57.842Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "title": "mm, thp: bail out early in collapse_file for writeback page",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47492",
    "datePublished": "2024-05-22T08:19:40.759Z",
    "dateReserved": "2024-05-22T06:20:56.201Z",
    "dateUpdated": "2024-11-04T12:06:57.842Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47492\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T09:15:11.030\",\"lastModified\":\"2024-05-22T12:46:53.887\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm, thp: bail out early in collapse_file for writeback page\\n\\nCurrently collapse_file does not explicitly check PG_writeback, instead,\\npage_has_private and try_to_release_page are used to filter writeback\\npages.  This does not work for xfs with blocksize equal to or larger\\nthan pagesize, because in such case xfs has no page-\u003eprivate.\\n\\nThis makes collapse_file bail out early for writeback page.  Otherwise,\\nxfs end_page_writeback will panic as follows.\\n\\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:ffff0003f88c86a8 index:0x0 pfn:0x84ef32\\n  aops:xfs_address_space_operations [xfs] ino:30000b7 dentry name:\\\"libtest.so\\\"\\n  flags: 0x57fffe0000008027(locked|referenced|uptodate|active|writeback)\\n  raw: 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8\\n  raw: 0000000000000000 0000000000000000 00000000ffffffff ffff0000c3e9a000\\n  page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u \u003c= 127u))\\n  page-\u003emem_cgroup:ffff0000c3e9a000\\n  ------------[ cut here ]------------\\n  kernel BUG at include/linux/mm.h:1212!\\n  Internal error: Oops - BUG: 0 [#1] SMP\\n  Modules linked in:\\n  BUG: Bad page state in process khugepaged  pfn:84ef32\\n   xfs(E)\\n  page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:0 index:0x0 pfn:0x84ef32\\n   libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ...\\n  CPU: 25 PID: 0 Comm: swapper/25 Kdump: loaded Tainted: ...\\n  pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)\\n  Call trace:\\n    end_page_writeback+0x1c0/0x214\\n    iomap_finish_page_writeback+0x13c/0x204\\n    iomap_finish_ioend+0xe8/0x19c\\n    iomap_writepage_end_bio+0x38/0x50\\n    bio_endio+0x168/0x1ec\\n    blk_update_request+0x278/0x3f0\\n    blk_mq_end_request+0x34/0x15c\\n    virtblk_request_done+0x38/0x74 [virtio_blk]\\n    blk_done_softirq+0xc4/0x110\\n    __do_softirq+0x128/0x38c\\n    __irq_exit_rcu+0x118/0x150\\n    irq_exit+0x1c/0x30\\n    __handle_domain_irq+0x8c/0xf0\\n    gic_handle_irq+0x84/0x108\\n    el1_irq+0xcc/0x180\\n    arch_cpu_idle+0x18/0x40\\n    default_idle_call+0x4c/0x1a0\\n    cpuidle_idle_call+0x168/0x1e0\\n    do_idle+0xb4/0x104\\n    cpu_startup_entry+0x30/0x9c\\n    secondary_start_kernel+0x104/0x180\\n  Code: d4210000 b0006161 910c8021 94013f4d (d4210000)\\n  ---[ end trace 4a88c6a074082f8c ]---\\n  Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm, thp: rescatar temprano en el colapso_archivo para la p\u00e1gina de reescritura. Actualmente, colapso_archivo no verifica expl\u00edcitamente PG_writeback; en su lugar, page_has_private y try_to_release_page se utilizan para filtrar las p\u00e1ginas de reescritura. Esto no funciona para xfs con un tama\u00f1o de bloque igual o mayor que el tama\u00f1o de p\u00e1gina, porque en tal caso xfs no tiene p\u00e1gina-\u0026gt;privada. Esto hace que colapso_file salga anticipadamente de la p\u00e1gina de reescritura. De lo contrario, xfs end_page_writeback entrar\u00e1 en p\u00e1nico de la siguiente manera. p\u00e1gina:fffffe00201bcc80 refcount:0 mapcount:0 mapeo:ffff0003f88c86a8 \u00edndice:0x0 pfn:0x84ef32 aops:xfs_address_space_operaciones [xfs] ino:30000b7 nombre dentry:\\\"libtest.so\\\" banderas: 0x57fffe0000008027(bloqueado|referenciado| actualizaci\u00f3n|activo|reescritura) sin formato : 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8 crudo: 0000000000000000 00000000000000000 00000000ffffffff p\u00e1gina volcada porque: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u \u0026lt;= 127u)) page-\u0026gt;mem_cgroup:ffff0000c3e9a000 ----------- -[ cortar aqu\u00ed ]------------ \u00a1ERROR del kernel en include/linux/mm.h:1212! Error interno: Ups - ERROR: 0 [#1] M\u00f3dulos SMP vinculados en: ERROR: Estado de p\u00e1gina incorrecto en el proceso khugepaged pfn:84ef32 xfs(E) page:fffffe00201bcc80 refcount:0 mapcount:0 mapeo:0 index:0x0 pfn:0x84ef32 libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ... CPU: 25 PID: 0 Comm: swapper/25 Kdump: cargado Contaminado: ... pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--) Seguimiento de llamadas: end_page_writeback+0x1c0/0x214 iomap_finish_page_writeback+0x13c/0x204 iomap_finish_ioend+0xe8/0x19c iomap_writepage_end_bio+0x38/0x50 bio_endio+0x168/0x1ec blk_update_request+0x278/0x 3f0 blk_mq_end_request+0x34/0x15c virtblk_request_done+0x38/0x74 [virtio_blk ] blk_done_softirq+0xc4/0x110 __do_softirq+0x128/0x38c __irq_exit_rcu+0x118/0x150 irq_exit+0x1c/0x30 __handle_domain_irq+0x8c/0xf0 gic_handle_irq+0x84/0x108 xcc/0x180 arch_cpu_idle+0x18/0x40 default_idle_call+0x4c/0x1a0 cpuidle_idle_call+0x168/ 0x1e0 do_idle+0xb4/0x104 cpu_startup_entry+0x30/0x9c second_start_kernel+0x104/0x180 C\u00f3digo: d4210000 b0006161 910c8021 94013f4d (d4210000) ---[ end trace 4a88c6a074082f 8c ]--- P\u00e1nico en el kernel - no se sincroniza: Ups - ERROR: excepci\u00f3n fatal en la interrupci\u00f3n\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5e669d8ab30ab61dec3c36e27b4711f07611e6fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/69a7fa5cb0de06c8956b040f19a7248c8c8308ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74c42e1baacf206338b1dd6b6199ac964512b5bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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