fd_seek with whence::set and a negative offset should error

[yagehu]

Describe the bug

fd_seek with whence set to set and a negative should error. It is the case on Linux host and other Wasm runtimes. However, Wasmer happily cast the negative offset to an unsigned offset and performs the seek.

$ wasmer -vV; rustc -vV
wasmer 4.2.8 (fe3c6d0 2024-04-11)
binary: wasmer-cli
commit-hash: fe3c6d0461f2ee646fd38d1d6480d7c3a30fec74
commit-date: 2024-04-11
host: x86_64-unknown-linux-gnu
compiler: singlepass,cranelift
rustc 1.77.1 (7cf61ebde 2024-03-27)
binary: rustc
commit-hash: 7cf61ebde7b22796c69757901dd346d0fe70bd97
commit-date: 2024-03-27
host: x86_64-unknown-linux-gnu
release: 1.77.1
LLVM version: 17.0.6

Steps to reproduce

fn main() {
    unsafe {
        let result = wasi::fd_seek(4, -1, wasi::WHENCE_SET);

        match result {
            Ok(new_offset) => eprintln!("fd_seek ok new offset {new_offset}"),
            Err(errno) => eprintln!("fd_seek errno {errno}"),
        }
    }
}

Compile this snippet to wasm32-wasi and run it with wasmer.

Expected behavior

The above snippet should print fd_seek errno INVAL (error 28).

Actual behavior

fd_seek ok new offset 18446744073709551615

Additional context

I have a fix. Will submit a PR.