Messages in this thread | | | Subject | Re: [PATCH v17 02/26] x86/cet/shstk: Add Kconfig option for user-mode control-flow protection | From | "Yu, Yu-cheng" <> | Date | Tue, 19 Jan 2021 10:10:24 -0800 |
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On 1/19/2021 3:06 AM, Borislav Petkov wrote: > On Tue, Dec 29, 2020 at 01:30:29PM -0800, Yu-cheng Yu wrote: >> Shadow Stack provides protection against function return address >> corruption. It is active when the processor supports it, the kernel has >> CONFIG_X86_CET_USER enabled, and the application is built for the feature. >> This is only implemented for the 64-bit kernel. When it is enabled, legacy >> non-Shadow Stack applications continue to work, but without protection. >> >> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com> >> --- >> arch/x86/Kconfig | 22 ++++++++++++++++++++++ >> arch/x86/Kconfig.assembler | 5 +++++ >> 2 files changed, 27 insertions(+) >> >> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig >> index 7b6dd10b162a..72cff400b9ae 100644 >> --- a/arch/x86/Kconfig >> +++ b/arch/x86/Kconfig >> @@ -1950,6 +1950,28 @@ config X86_SGX >> >> If unsure, say N. >> >> +config ARCH_HAS_SHADOW_STACK >> + def_bool n >> + >> +config X86_CET_USER > > That thing needs to be X86_CET. How many times do I need to type this > before you do it? >
Yes, I totally understand that now. I was still thinking about separately enabling user/kernel mode. Perhaps I should have communicated that thought before the change. Sorry about that. I will update it.
-- Yu-cheng
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