Messages in this thread | | | From | "Edgecombe, Rick P" <> | Subject | Re: [PATCH v2 03/39] x86/cpufeatures: Add CPU feature flags for shadow stacks | Date | Fri, 14 Oct 2022 19:35:41 +0000 |
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On Fri, 2022-10-14 at 18:20 +0200, Borislav Petkov wrote: > 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>
Thanks!
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