linux-user/elfload.c: Seeing a segfault in qemu with a binary with no data section

[Stephen Long]

Hi, we are seeing a segfault in qemu in the following code snippet in 
zero_bss():

if (host_start < host_map_start) {
  memset((void *)host_start, 0, host_map_start - host_start);
}

The elf doesn't have a data section, so host_start isn't mapped. I'm not sure 
whether this is a qemu issue or the generated elf is no good.

Thanks,
Stephen