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CVE-2024-46701 (GCVE-0-2024-46701)

Vulnerability from cvelistv5 – Published: 2024-09-13 06:27 – Updated: 2026-05-11 20:34
VLAI
Title
libfs: fix infinite directory reads for offset dir
Summary
In the Linux kernel, the following vulnerability has been resolved: libfs: fix infinite directory reads for offset dir After we switch tmpfs dir operations from simple_dir_operations to simple_offset_dir_operations, every rename happened will fill new dentry to dest dir's maple tree(&SHMEM_I(inode)->dir_offsets->mt) with a free key starting with octx->newx_offset, and then set newx_offset equals to free key + 1. This will lead to infinite readdir combine with rename happened at the same time, which fail generic/736 in xfstests(detail show as below). 1. create 5000 files(1 2 3...) under one dir 2. call readdir(man 3 readdir) once, and get one entry 3. rename(entry, "TEMPFILE"), then rename("TEMPFILE", entry) 4. loop 2~3, until readdir return nothing or we loop too many times(tmpfs break test with the second condition) We choose the same logic what commit 9b378f6ad48cf ("btrfs: fix infinite directory reads") to fix it, record the last_index when we open dir, and do not emit the entry which index >= last_index. The file->private_data now used in offset dir can use directly to do this, and we also update the last_index when we llseek the dir file. [brauner: only update last_index after seek when offset is zero like Jan suggested]
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-29 15:04 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 308b4fc2403b335894592ee9dc212a5e58bb309f (git)
Affected: a2e459555c5f9da3e619b7e47a63f98574dc75f1 , < 64a7ce76fb901bf9f9c36cf5d681328fc0fd4b5a (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.10.7 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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