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arch/x86_64: Add ARCH_INTEL64_DISABLE_CET #13417

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Sep 13, 2024
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arch/x86_64: Add ARCH_INTEL64_DISABLE_CET #13417

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4 changes: 4 additions & 0 deletions arch/x86_64/src/common/Toolchain.defs
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,10 @@ ARCHCPUFLAGS = -fPIC -fno-stack-protector -mno-red-zone -mrdrnd
ARCHPICFLAGS = -fPIC
ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef

ifeq ($(CONFIG_ARCH_INTEL64_DISABLE_CET),y)
ARCHOPTIMIZATION += -fcf-protection=none
endif

# We have to use a cross-development toolchain under Cygwin because the native
# Cygwin toolchains don't generate ELF binaries.

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9 changes: 9 additions & 0 deletions arch/x86_64/src/intel64/Kconfig
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Expand Up @@ -183,4 +183,13 @@ config ARCH_INTEL64_DISABLE_INT_INIT
controllers. This is necessary if those are already
initialized, i.e. Jailhouse system.

config ARCH_INTEL64_DISABLE_CET
bool "Disable CET completely"
---help---
Intel CET (Control-flow Enforcement Technology) is a hardware
enhancement aimed at mitigating the Retpoline vulnerability.
It inserts the endbr64 instruction at the beginning of functions,
which may impact CPU branch prediction performance.


endif
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