linux-kernel - Re: [PATCH v2 02/39] x86/cet/shstk: Add Kconfig option for Shadow Stack

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Message-ID: <0ee0e91fef2b4cf86d8bd544aac80e84454a30f4.camel@intel.com>
Date:   Mon, 3 Oct 2022 19:52:54 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
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Subject: Re: [PATCH v2 02/39] x86/cet/shstk: Add Kconfig option for Shadow
 Stack

On Mon, 2022-10-03 at 10:25 -0700, Kees Cook wrote:
> > +config X86_SHADOW_STACK
> > +     prompt "X86 Shadow Stack"
> > +     def_bool n
> 
> I hope we can switch this to "default y" soon, given it's a hardware
> feature that is disabled at runtime when not available.

Hmm, yes. Not sure on this. I'm inclined to leave it as is for now.

> 
> > +     depends on ARCH_HAS_SHADOW_STACK
> 
> Doesn't this depend on AS_WRUSS too?

Yes, this got messed up when this patch went to and from the CET KVM
series.

Thanks!