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Alpine Linux: CVE-2022-42324: Incorrect Conversion between Numeric Types

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Alpine Linux: CVE-2022-42324: Incorrect Conversion between Numeric Types

Severity
5
CVSS
(AV:L/AC:L/Au:S/C:N/I:N/A:C)
Published
11/01/2022
Created
03/22/2024
Added
03/26/2024
Modified
10/02/2024

Description

Oxenstored 32->31 bit integer truncation issues Integers in Ocaml are 63 or 31 bits of signed precision. The Ocaml Xenbus library takes a C uint32_t out of the ring and casts it directly to an Ocaml integer. In 64-bit Ocaml builds this is fine, but in 32-bit builds, it truncates off the most significant bit, and then creates unsigned/signed confusion in the remainder. This in turn can feed a negative value into logic not expecting a negative value, resulting in unexpected exceptions being thrown. The unexpected exception is not handled suitably, creating a busy-loop trying (and failing) to take the bad packet out of the xenstore ring.

Solution(s)

  • alpine-linux-upgrade-xen

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