The mode in the open hypercall is passed in hex, but it should be passed as octal. This results in strange permissions of files which are created by uhyve.

https://github.com/hermitcore/libhermit-rs/blob/44eaa9f693566413884f505552f74f2e25863e78/src/syscalls/interfaces/mod.rs#L58-L69

Example: 1991 = 0x777 is passed but it should be 511 = 0o777 instead. The flags field is passed correctly.

@tlambertz pointed out that this has to be fixed in the stdlib