tools/ocaml: Ensure packet size is never negative

tools/ocaml: Ensure packet size is never negative

Integers in Ocaml have 63 or 31 bits of signed precision.

On 64-bit builds of Ocaml, this is fine because a C uint32_t always fits
within a 63-bit signed integer.

In 32-bit builds of Ocaml, this goes wrong.  The C uint32_t is truncated
first (loses the top bit), then has a unsigned/signed mismatch.

A "negative" value (i.e. a packet on the ring of between 1G and 2G in size)
will trigger an exception later in Bytes.make in xb.ml, and because the packet
is not removed from the ring, the exception re-triggers on every subsequent
query, creating a livelock.

Fix both the source of the exception in Xb, and as defence in depth, mark the
domain as bad for any Invalid_argument exceptions to avoid the risk of
livelock.

This is XSA-420 / CVE-2022-42324.

Signed-off-by: Edwin Török <edvin.torok@citrix.com>
Acked-by: Christian Lindig <christian.lindig@citrix.com>