CVE-2024-57942 (GCVE-0-2024-57942)

Vulnerability from cvelistv5 – Published: 2025-01-21 12:18 – Updated: 2026-05-11 21:01
VLAI
Title
netfs: Fix ceph copy to cache on write-begin
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix ceph copy to cache on write-begin At the end of netfs_unlock_read_folio() in which folios are marked appropriately for copying to the cache (either with by being marked dirty and having their private data set or by having PG_private_2 set) and then unlocked, the folio_queue struct has the entry pointing to the folio cleared. This presents a problem for netfs_pgpriv2_write_to_the_cache(), which is used to write folios marked with PG_private_2 to the cache as it expects to be able to trawl the folio_queue list thereafter to find the relevant folios, leading to a hang. Fix this by not clearing the folio_queue entry if we're going to do the deprecated copy-to-cache. The clearance will be done instead as the folios are written to the cache. This can be reproduced by starting cachefiles, mounting a ceph filesystem with "-o fsc" and writing to it.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < 43b8d3249b0b71bad239d42dbe08ce6c938ba000 (git)
Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < 38cf8e945721ffe708fa675507465da7f4f2a9f7 (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.10 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix ceph copy to cache on write-begin\n\nAt the end of netfs_unlock_read_folio() in which folios are marked\nappropriately for copying to the cache (either with by being marked dirty\nand having their private data set or by having PG_private_2 set) and then\nunlocked, the folio_queue struct has the entry pointing to the folio\ncleared.  This presents a problem for netfs_pgpriv2_write_to_the_cache(),\nwhich is used to write folios marked with PG_private_2 to the cache as it\nexpects to be able to trawl the folio_queue list thereafter to find the\nrelevant folios, leading to a hang.\n\nFix this by not clearing the folio_queue entry if we\u0027re going to do the\ndeprecated copy-to-cache.  The clearance will be done instead as the folios\nare written to the cache.\n\nThis can be reproduced by starting cachefiles, mounting a ceph filesystem\nwith \"-o fsc\" and writing to it."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfs: Fix ceph copy to cache on write-begin Al final de netfs_unlock_read_folio() en el que los folios se marcan adecuadamente para copiarlos al cach\u00e9 (ya sea marc\u00e1ndolos como sucios y teniendo sus datos privados configurados o teniendo PG_private_2 configurado) y luego se desbloquean, la estructura folio_queue tiene la entrada que apunta al folio borrada. Esto presenta un problema para netfs_pgpriv2_write_to_the_cache(), que se usa para escribir folios marcados con PG_private_2 en el cach\u00e9, ya que espera poder rastrear la lista folio_queue a partir de entonces para encontrar los folios relevantes, lo que lleva a un bloqueo. Solucione esto al no borrar la entrada folio_queue si vamos a hacer la copia al cach\u00e9 obsoleta. La limpieza se realizar\u00e1 en su lugar a medida que los folios se escriben en el cach\u00e9. Esto se puede reproducir iniciando cachefiles, montando un sistema de archivos ceph con \"-o fsc\" y escribiendo en \u00e9l."
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      "id": "CVE-2024-57942",
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}



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