CVE-2023-52497 (GCVE-0-2023-52497)

Vulnerability from cvelistv5 – Published: 2024-02-29 15:52 – Updated: 2025-05-04 07:38
VLAI?
Title
erofs: fix lz4 inplace decompression
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: fix lz4 inplace decompression Currently EROFS can map another compressed buffer for inplace decompression, that was used to handle the cases that some pages of compressed data are actually not in-place I/O. However, like most simple LZ77 algorithms, LZ4 expects the compressed data is arranged at the end of the decompressed buffer and it explicitly uses memmove() to handle overlapping: __________________________________________________________ |_ direction of decompression --> ____ |_ compressed data _| Although EROFS arranges compressed data like this, it typically maps two individual virtual buffers so the relative order is uncertain. Previously, it was hardly observed since LZ4 only uses memmove() for short overlapped literals and x86/arm64 memmove implementations seem to completely cover it up and they don't have this issue. Juhyung reported that EROFS data corruption can be found on a new Intel x86 processor. After some analysis, it seems that recent x86 processors with the new FSRM feature expose this issue with "rep movsb". Let's strictly use the decompressed buffer for lz4 inplace decompression for now. Later, as an useful improvement, we could try to tie up these two buffers together in the correct order.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0ffd71bcc3a03ebb3551661a36052488369c4de9 , < 9ff2d260b25df6fe1341a79113d88fecf6bd553e (git)
Affected: 0ffd71bcc3a03ebb3551661a36052488369c4de9 , < a0180e940cf1aefa7d516e20b259ad34f7a8b379 (git)
Affected: 0ffd71bcc3a03ebb3551661a36052488369c4de9 , < 77cbc04a1a8610e303a0e0d74f2676667876a184 (git)
Affected: 0ffd71bcc3a03ebb3551661a36052488369c4de9 , < 33bf23c9940dbd3a22aad7f0cda4c84ed5701847 (git)
Affected: 0ffd71bcc3a03ebb3551661a36052488369c4de9 , < f36d200a80a3ca025532ed60dd1ac21b620e14ae (git)
Affected: 0ffd71bcc3a03ebb3551661a36052488369c4de9 , < bffc4cc334c5bb31ded54bc3cfd651735a3cb79e (git)
Affected: 0ffd71bcc3a03ebb3551661a36052488369c4de9 , < 3c12466b6b7bf1e56f9b32c366a3d83d87afb4de (git)
Create a notification for this product.
    Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.4.285 , ≤ 5.4.* (semver)
Unaffected: 5.10.211 , ≤ 5.10.* (semver)
Unaffected: 5.15.150 , ≤ 5.15.* (semver)
Unaffected: 6.1.76 , ≤ 6.1.* (semver)
Unaffected: 6.6.15 , ≤ 6.6.* (semver)
Unaffected: 6.7.3 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.