On 08/04/2016 01:24, Andy Lutomirski wrote: > I can't see any reason that we need the __KERNEL_DS segment at all -- > I think that everything that uses __KERNEL_DS could use __USER_DS > instead. Am I missing anything? This has been bugging me for a > while. > > I mulled over this a bit when trying to understand the sysret_ss_attrs > bug and then forgot about it.
Linux doesn't have a separate __KERNEL_SS. For the plain data segments, the dpl is not interesting. However, %ss is also loaded with __KERNEL_DS, and %ss.dpl is somewhat important. ~Andrew
