Messages in this thread | | | Date | Mon, 3 Oct 2022 10:26:50 -0700 | From | Kees Cook <> | Subject | Re: [PATCH v2 03/39] x86/cpufeatures: Add CPU feature flags for shadow stacks |
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On Thu, Sep 29, 2022 at 03:29:00PM -0700, Rick Edgecombe wrote: > From: Yu-cheng Yu <yu-cheng.yu@intel.com> > > The Control-Flow Enforcement Technology contains two related features, > one of which is Shadow Stacks. Future patches will utilize this feature > for shadow stack support in KVM, so add a CPU feature flags for Shadow > Stacks (CPUID.(EAX=7,ECX=0):ECX[bit 7]). > > To protect shadow stack state from malicious modification, the registers > are only accessible in supervisor mode. This implementation > context-switches the registers with XSAVES. Make X86_FEATURE_SHSTK depend > on XSAVES. > > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
-- Kees Cook
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