UBUNTU-CVE-2022-42324

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UBUNTU-CVE-2022-42324

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2022-42324, https://xenbits.xen.org/xsa/advisory-420.html, https://xenbits.xenproject.org/xsa/advisory-420.txt, http://xenbits.xen.org/xsa/advisory-420.html, http://www.openwall.com/lists/oss-security/2022/11/01/10, https://www.cve.org/CVERecord?id=CVE-2022-42324