cve-2024-26885
Vulnerability from cvelistv5
Published
2024-04-17 10:27
Modified
2025-01-24 16:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix DEVMAP_HASH overflow check on 32-bit arches The devmap code allocates a number hash buckets equal to the next power of two of the max_entries value provided when creating the map. When rounding up to the next power of two, the 32-bit variable storing the number of buckets can overflow, and the code checks for overflow by checking if the truncated 32-bit value is equal to 0. However, on 32-bit arches the rounding up itself can overflow mid-way through, because it ends up doing a left-shift of 32 bits on an unsigned long value. If the size of an unsigned long is four bytes, this is undefined behaviour, so there is no guarantee that we'll end up with a nice and tidy 0-value at the end. Syzbot managed to turn this into a crash on arm32 by creating a DEVMAP_HASH with max_entries > 0x80000000 and then trying to update it. Fix this by moving the overflow check to before the rounding up operation.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f5e352b9088211fa5eb4e1639cd365f4f7d2f65
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b81a9f92b3676cb74b907a7a209b3d15bd9a7f9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/225da02acdc97af01b6bc6ce1a3e5362bf01d3fbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Impacted products
Vendor Product Version
Linux Linux Version: 6f9d451ab1a33728adb72d7ff66a7b374d665176
Version: 6f9d451ab1a33728adb72d7ff66a7b374d665176
Version: 6f9d451ab1a33728adb72d7ff66a7b374d665176
Version: 6f9d451ab1a33728adb72d7ff66a7b374d665176
Version: 6f9d451ab1a33728adb72d7ff66a7b374d665176
Version: 6f9d451ab1a33728adb72d7ff66a7b374d665176
Version: 6f9d451ab1a33728adb72d7ff66a7b374d665176
Version: 6f9d451ab1a33728adb72d7ff66a7b374d665176
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   Linux Linux Version: 5.4
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If the\\nsize of an unsigned long is four bytes, this is undefined behaviour, so\\nthere is no guarantee that we\u0027ll end up with a nice and tidy 0-value at\\nthe end.\\n\\nSyzbot managed to turn this into a crash on arm32 by creating a\\nDEVMAP_HASH with max_entries \u003e 0x80000000 and then trying to update it.\\nFix this by moving the overflow check to before the rounding up\\noperation.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: corrige la verificaci\u00f3n de desbordamiento de DEVMAP_HASH en arcos de 32 bits. El c\u00f3digo devmap asigna un n\u00famero de dep\u00f3sitos de hash igual a la siguiente potencia de dos del valor max_entries proporcionado al crear el mapa. Al redondear a la siguiente potencia de dos, la variable de 32 bits que almacena el n\u00famero de dep\u00f3sitos puede desbordarse, y el c\u00f3digo verifica el desbordamiento comprobando si el valor truncado de 32 bits es igual a 0. 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      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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