CVE-2024-47727 x86/tdx: Fix "in-kernel MMIO" check

In the Linux kernel, the following vulnerability has been resolved: x86/tdx: Fix "in-kernel MMIO" check TDX only supports kernel-initiated MMIO operations. The handlemmio function checks if the VE exception occurred in the kernel and rejects the operation if it did not. However, userspace can...

CVE-2024-47727

CVE-2024-47727 is a Linux kernel issue (x86/tdx) where userspace could trick the kernel into performing MMIO via #VE by pointing a syscall at an MMIO address. The root cause was the in-kernel MMIO check in handle_mmio() not guaranteeing the target MMIO address was within the kernel before decodin...