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SubjectRe: [Xen-devel] Does __KERNEL_DS serve a purpose?
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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

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