ghsa-983w-hqxf-c48p
Vulnerability from github
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.
{
"affected": [],
"aliases": [
"CVE-2024-57942"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-01-21T13:15:08Z",
"severity": null
},
"details": "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.",
"id": "GHSA-983w-hqxf-c48p",
"modified": "2025-01-21T15:31:03Z",
"published": "2025-01-21T15:31:03Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-57942"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/38cf8e945721ffe708fa675507465da7f4f2a9f7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/43b8d3249b0b71bad239d42dbe08ce6c938ba000"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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