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fs: relax assertions on failure to encode file handles (Linux Linux)

CVE-2024-57924
MEDIUM 5.5

At a glance

Source
NVD
EPSS
EPSS 0.28 % · percentile 20 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

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Description

In the Linux kernel, the following vulnerability has been resolved: fs: relax assertions on failure to encode file handles Encoding file handles is usually performed by a filesystem >encode_fh() method that may fail for various reasons. The legacy users of exportfs_encode_fh(), namely, nfsd and name_to_handle_at(2) syscall are ready to cope with the possibility of failure to encode a file handle. There are a few other users of exportfs_encode_{fh,fid}() that currently have a WARN_ON() assertion when ->encode_fh() fails. Relax those assertions because they are wrong. The second linked bug report states commit 16aac5ad1fa9 ("ovl: support encoding non-decodable file handles") in v6.6 as the regressing commit, but this is not accurate. The aforementioned commit only increases the chances of the assertion and allows triggering the assertion with the reproducer using overlayfs, inotify and drop_caches. Triggering this assertion was always possible with other filesystems and other reasons of ->encode_fh() failures and more particularly, it was also possible with the exact same reproducer using overlayfs that is mounted with options index=on,nfs_export=on also on kernels < v6.6. Therefore, I am not listing the aforementioned commit as a Fixes commit. Backport hint: this patch will have a trivial conflict applying to v6.6.y, and other trivial conflicts applying to stable kernels < v6.6.

Weaknesses (CWE)

  • CWE-617 — Reachable Assertion

References

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected be77196b809cdce8603a5aadd5e3cfabd3cbef96 < 73697928c806fe4689939722184a86fc1c1957b4 ; affected be77196b809cdce8603a5aadd5e3cfabd3cbef96 < f47c834a9131ae64bee3c462f4e610c67b0a000f ; affected be77196b809cdce8603a5aadd5e3cfabd3cbef96 < adcde2872f8fc399b249758ae1990dcd53b694ea ; affected be77196b809cdce8603a5aadd5e3cfabd3cbef96 < 974e3fe0ac61de85015bbe5a4990cf4127b304b2
Linux · Linuxaffected 3.8 ; unaffected 0 < 3.8 ; unaffected 6.1.151 ≤ 6.1.* ; unaffected 6.6.74 ≤ 6.6.* ; unaffected 6.12.10 ≤ 6.12.* ; unaffected 6.13 ≤ *

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD