cve-2021-47492
Vulnerability from cvelistv5
Published
2024-05-22 08:19
Modified
2024-12-19 07:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm, thp: bail out early in collapse_file for writeback page Currently collapse_file does not explicitly check PG_writeback, instead, page_has_private and try_to_release_page are used to filter writeback pages. This does not work for xfs with blocksize equal to or larger than pagesize, because in such case xfs has no page->private. This makes collapse_file bail out early for writeback page. Otherwise, xfs end_page_writeback will panic as follows. page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:ffff0003f88c86a8 index:0x0 pfn:0x84ef32 aops:xfs_address_space_operations [xfs] ino:30000b7 dentry name:"libtest.so" flags: 0x57fffe0000008027(locked|referenced|uptodate|active|writeback) raw: 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8 raw: 0000000000000000 0000000000000000 00000000ffffffff ffff0000c3e9a000 page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u <= 127u)) page->mem_cgroup:ffff0000c3e9a000 ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:1212! Internal error: Oops - BUG: 0 [#1] SMP Modules linked in: BUG: Bad page state in process khugepaged pfn:84ef32 xfs(E) page:fffffe00201bcc80 refcount:0 mapcount:0 mapping:0 index:0x0 pfn:0x84ef32 libcrc32c(E) rfkill(E) aes_ce_blk(E) crypto_simd(E) ... CPU: 25 PID: 0 Comm: swapper/25 Kdump: loaded Tainted: ... pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--) Call trace: 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+0x278/0x3f0 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 el1_irq+0xcc/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 secondary_start_kernel+0x104/0x180 Code: d4210000 b0006161 910c8021 94013f4d (d4210000) ---[ end trace 4a88c6a074082f8c ]--- Kernel panic - not syncing: Oops - BUG: Fatal exception in interrupt
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
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5e669d8ab30ab61dec3c36e27b4711f07611e6fc
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/69a7fa5cb0de06c8956b040f19a7248c8c8308ca
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/74c42e1baacf206338b1dd6b6199ac964512b5bb
Impacted products
Vendor Product Version
Linux Linux Version: 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0
Version: 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0
Version: 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0
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   Linux Linux Version: 5.4
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Actualmente, colapso_archivo no verifica explícitamente PG_writeback; en su lugar, page_has_private y try_to_release_page se utilizan para filtrar las páginas de reescritura. Esto no funciona para xfs con un tamaño de bloque igual o mayor que el tamaño de página, porque en tal caso xfs no tiene página-&gt;privada. Esto hace que colapso_file salga anticipadamente de la página de reescritura. De lo contrario, xfs end_page_writeback entrará en pánico de la siguiente manera. página:fffffe00201bcc80 refcount:0 mapcount:0 mapeo:ffff0003f88c86a8 índice:0x0 pfn:0x84ef32 aops:xfs_address_space_operaciones [xfs] ino:30000b7 nombre dentry:\\\"libtest.so\\\" banderas: 0x57fffe0000008027(bloqueado|referenciado| actualización|activo|reescritura) sin formato : 57fffe0000008027 ffff80001b48bc28 ffff80001b48bc28 ffff0003f88c86a8 crudo: 0000000000000000 00000000000000000 00000000ffffffff página volcada porque: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u &lt;= 127u)) page-&gt;mem_cgroup:ffff0000c3e9a000 ----------- -[ cortar aquí ]------------ ¡ERROR del kernel en include/linux/mm.h:1212! Error interno: Ups - ERROR: 0 [#1] Módulos SMP vinculados en: ERROR: Estado de página 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 Código: d4210000 b0006161 910c8021 94013f4d (d4210000) ---[ end trace 4a88c6a074082f 8c ]--- Pánico en el kernel - no se sincroniza: Ups - ERROR: excepción fatal en la interrupción\"}],\"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\"},{\"url\":\"https://git.kernel.org/stable/c/5e669d8ab30ab61dec3c36e27b4711f07611e6fc\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/69a7fa5cb0de06c8956b040f19a7248c8c8308ca\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/74c42e1baacf206338b1dd6b6199ac964512b5bb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
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This does not work for xfs with blocksize equal to or larger\\nthan pagesize, because in such case xfs has no page->private.\\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 <= 127u))\\n  page->mem_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\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T11:42:20.592Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2021-47492\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T11:42:20.592Z\", \"dateReserved\": \"2024-05-22T06:20:56.201Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:40.759Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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