posix ql_syscall_bind unpacks sin_family with wrong endianess on MIPS MSB

[nezza]

Describe the bug
Running OpenWRT's uhttpd (uhttpd: ELF 32-bit MSB executable, MIPS, MIPS32 version 1 (SYSV), dynamically linked, interpreter /lib/ld-musl-mips-sf.so.1, no section header) the bind syscall will fail because sin_family is unpacked as little endian, even though it's encoded in big endian.

The example file is attached as uhttpd.zip.

Sample Code/Sample fix

def ql_syscall_bind(ql, bind_fd, bind_addr, bind_addrlen,  *args, **kw):
    regreturn = 0

    if ql.archtype== QL_ARCH.X8664:
        data = ql.mem.read(bind_addr, 8)
    else:
        data = ql.mem.read(bind_addr, bind_addrlen)

    # Works
    sin_family, = struct.unpack(">h", data[:2])
    # Doesn't work
    # sin_family, = struct.unpack("<h", data[:2])

I am unsure how to solve this, as I assume this works on other architectures? What's the "qiling way" of handling unpacks for different endianess?

[xwings]

I did not really test MSB binary before, except hello world binary.

i will give it a try once i have time.

[xwings]

This should be solved with the latest version of Qiling.