Re: [RFC PATCH] x86: Make sure verify_cpu has a good stack

[H. Peter Anvin]

On March 2, 2016 10:15:56 AM PST, Borislav Petkov <bp@xxxxxxxxx> wrote:
>On Wed, Mar 02, 2016 at 09:53:28AM -0800, H. Peter Anvin wrote:
>> Please explain why we can't use rip-relative addressing in some
>form...
>
>We *can* do almost what Brian suggested:
>
>        movq    stack_start(%rip), %rsp
>        subq    $__START_KERNEL_map, %rsp
>
>But we still have to subtract __START_KERNEL_map.

Obviously.
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