mm/swapfile: skip HugeTLB pages for unuse_vma (Linux Linux)

CVE-2024-50199
MEDIUM 5.5

En bref

Source
NVD
EPSS
EPSS 0.22 % · centile 13 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: mm/swapfile: skip HugeTLB pages for unuse_vma I got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The problem can be reproduced by the following steps: 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory. 2. Swapout the above anonymous memory. 3. run swapoff and we will get a bad pud error in kernel message: mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7) We can tell that pud_clear_bad is called by pud_none_or_clear_bad in unuse_pud_range() by ftrace. And therefore the HugeTLB pages will never be freed because we lost it from page table. We can skip HugeTLB pages for unuse_vma to fix it.

Références

Scores

VersionScoreVecteurÉvalué par
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)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f < ba7f982cdb37ff5a7739dec85d7325ea66fc1496 ; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f < 417d5838ca73c6331ae2fe692fab6c25c00d9a0b ; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f < e41710f5a61aca9d6baaa8f53908a927dd9e7aa7 ; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f < 6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf ; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f < bed2b9037806c62166a0ef9a559a1e7e3e1275b8 ; affected 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f < eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87
Linux · Linuxaffected 2.6.36 ; unaffected 0 < 2.6.36 ; unaffected 5.4.285 ≤ 5.4.* ; unaffected 5.10.228 ≤ 5.10.* ; unaffected 5.15.169 ≤ 5.15.* ; unaffected 6.1.114 ≤ 6.1.*

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