diff mbox series

[v18,1/7] x86/cet/ibt: Update Kconfig for user-mode Indirect Branch Tracking

Message ID 20210127213028.11362-2-yu-cheng.yu@intel.com (mailing list archive)
State New
Headers show
Series Control-flow Enforcement: Indirect Branch Tracking | expand

Commit Message

Yu, Yu-cheng Jan. 27, 2021, 9:30 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>
---
 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index aec4c988a5ae..b3d2b821ec10 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1962,6 +1962,7 @@  config X86_CET
 	def_bool n
 	depends on CPU_SUP_INTEL && X86_64
 	depends on AS_WRUSS
+	depends on $(cc-option,-fcf-protection)
 	select ARCH_USES_HIGH_VMA_FLAGS
 	select ARCH_HAS_SHADOW_STACK
 	select ARCH_MAYBE_MKWRITE