libxl: Use zero-ed memory for PVH acpi tables

libxl: Use zero-ed memory for PVH acpi tables

xl/libxl memory is leaking into a PVH guest through uninitialized
portions of the ACPI tables.

Use libxl_zalloc() to obtain zero-ed memory to avoid this issue.

This is XSA-464 / CVE-2024-45819.

Signed-off-by: Jason Andryuk <jason.andryuk@amd.com>
Fixes: 14c0d328da2b ("libxl/acpi: Build ACPI tables for HVMlite guests")
Reviewed-by: Jan Beulich <jbeulich@suse.com>
master commit: 0bfe567b58f1182889dea9207103fc9d00baf414
master date: 2024-11-12 13:32:45 +0100