Maybe unsound in some as_ptr usage

[lwz23]

Hello, thank you for your contribution in this project. I am scanning unsound problem in rust project and I notice the following code:

aero/src/aero_kernel/src/acpi/rsdp.rs

Line 94 in c5f8114

pub fn new(address: VirtAddr) -> &'static Self {

pub fn new(address: VirtAddr) -> &'static Self {
        let this = unsafe { &*address.as_ptr::<Self>() };

        let valid_checksum = this.header.is_valid();
        let valid_signature = this.header.signature() == b"RSDT";

        assert!(valid_checksum, "rsdp: failed to validate RSDT checksum");
        assert!(valid_signature, "rsdp: failed to validate RSDT signature");

        this
    }

Considering this is a pub function and there is no varify in VirtAddr contruct method, I think this is unsound because the address can be any invalid value and deference it will result in UB.

[lwz23]

aero/src/aero_kernel/src/acpi/rsdp.rs

Line 134 in c5f8114

impl Rsdt<u64> {

same problem