fkie_cve-2021-47492
Vulnerability from fkie_nvd
Published
2024-05-22 09:15
Modified
2025-09-29 16:35
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
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.15 | |
| linux | linux_kernel | 5.15 | |
| linux | linux_kernel | 5.15 | |
| linux | linux_kernel | 5.15 | |
| linux | linux_kernel | 5.15 | |
| linux | linux_kernel | 5.15 | |
| linux | linux_kernel | 5.15 |
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"cveTags": [],
"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"
}
],
"id": "CVE-2021-47492",
"lastModified": "2025-09-29T16:35:34.680",
"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": "2024-05-22T09:15:11.030",
"references": [
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
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"description": [
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"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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