CVE-2023-52497
Vulnerability from cvelistv5
Published
2024-02-29 15:52
Modified
2024-12-19 08:20
Severity ?
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33bf23c9940dbd3a22aad7f0cda4c84ed5701847
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c12466b6b7bf1e56f9b32c366a3d83d87afb4de
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77cbc04a1a8610e303a0e0d74f2676667876a184
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ff2d260b25df6fe1341a79113d88fecf6bd553e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a0180e940cf1aefa7d516e20b259ad34f7a8b379
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bffc4cc334c5bb31ded54bc3cfd651735a3cb79e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f36d200a80a3ca025532ed60dd1ac21b620e14ae
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/33bf23c9940dbd3a22aad7f0cda4c84ed5701847
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3c12466b6b7bf1e56f9b32c366a3d83d87afb4de
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/77cbc04a1a8610e303a0e0d74f2676667876a184
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a0180e940cf1aefa7d516e20b259ad34f7a8b379
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bffc4cc334c5bb31ded54bc3cfd651735a3cb79e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f36d200a80a3ca025532ed60dd1ac21b620e14ae
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Impacted products
Vendor Product Version
Linux Linux Version: 5.3
Show details on NVD website

To clipboard 

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Sin embargo, como la mayor\u00eda de los algoritmos LZ77 simples, LZ4 espera que los datos comprimidos est\u00e9n organizados al final del buffer descomprimido y usa expl\u00edcitamente memmove() para manejar la superposici\u00f3n: ________________________________________________________ |_ direcci\u00f3n de descompresi\u00f3n --\u0026gt; ____ |_ datos comprimidos _| Aunque EROFS organiza los datos comprimidos de esta manera, normalmente asigna dos buffers virtuales individuales, por lo que el orden relativo es incierto. Anteriormente, apenas se observaba ya que LZ4 solo usa memmove() para literales cortos superpuestos y las implementaciones de memmove x86/arm64 parecen cubrirlo por completo y no tienen este problema. Juhyung inform\u00f3 que se pueden encontrar da\u00f1os en los datos EROFS en un nuevo procesador Intel x86. 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}


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