Messages in this thread | | | Date | Fri, 14 Oct 2022 18:20:38 +0200 | From | Borislav Petkov <> | 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> > Co-developed-by: Rick Edgecombe <rick.p.edgecombe@intel.com> > Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com> > Cc: Kees Cook <keescook@chromium.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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