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[v20,1/7] x86/cet/ibt: Update Kconfig for user-mode Indirect Branch Tracking

Message ID 20210210180245.13770-2-yu-cheng.yu@intel.com (mailing list archive)
State New, archived
Headers show
Series Control-flow Enforcement: Indirect Branch Tracking | expand

Commit Message

Yu-cheng Yu Feb. 10, 2021, 6:02 p.m. UTC 
Indirect branch tracking is a hardware security feature that verifies near
indirect call/jump instructions arrive at intended targets, which are
labeled by the compiler with ENDBR opcodes.  If such instructions reach
unlabeled locations, the processor raises control-protection faults.

Check the compiler is up-to-date at config time.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 816830e3f062..f462ef9d3305 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1964,6 +1964,7 @@  config X86_CET
 	depends on X86_64
 	depends on AS_WRUSS
 	depends on ARCH_HAS_SHADOW_STACK
+	depends on $(cc-option,-fcf-protection)
 	select ARCH_USES_HIGH_VMA_FLAGS
 	select ARCH_MAYBE_MKWRITE
 	select ARCH_USE_GNU_PROPERTY