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

From: Borislav Petkov
Date: Wed Mar 02 2016 - 15:46:32 EST


On Wed, Mar 02, 2016 at 08:50:53PM +0100, Borislav Petkov wrote:
> But better safe than sorry.

I got this, it looks good when I'm single-stepping through it with gdb
and it boots fine in kvm. I'll run it on baremetal tomorrow:

/*
* Setup stack for verify_cpu(): make sure we don't clobber a valid
* stack pointer by using temporary registers.
*/
movq stack_start(%rip), %rax
movq $__START_KERNEL_map, %rdx
subq %rdx, %rax
movq %rax, %rsp

Thanks.

--
Regards/Gruss,
Boris.

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