Re: [PATCH v5 32/32] x86/mm: Add support to make use of Secure Memory Encryption

Borislav Petkov
2017-05-31T09:16:23Z

On Tue, May 30, 2017 at 10:48:27AM -0500, Tom Lendacky wrote:
> I'll look at doing that instead of removing the support for the whole
> file.

Right, so I don't think the stack protector is even ready that early -
we do set it up later:

/* Set up %gs.
*
* The base of %gs always points to the bottom of the irqstack
* union. If the stack protector canary is enabled, it is
* located at %gs:40. Note that, on SMP, the boot cpu uses
* init data section till per cpu areas are set up.
*/
movl $MSR_GS_BASE,%ecx
movl initial_gs(%rip),%eax
movl initial_gs+4(%rip),%edx
wrmsr

so I think marking the function "no-stack-protector" is the only option
right now. We can always look at fixing that later.

--
Regards/Gruss,
Boris.

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