arch/x86_64: Add ARCH_INTEL64_DISABLE_CET #13417
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Intel CET (Control-flow Enforcement Technology) is a hardware enhancement aimed at mitigating the Retpoline vulnerability, but it may impact CPU branch prediction performance. This commit added ARCH_INTEL64_DISABLE_CET, which can disable CET completely with compilation option `-fcf-protection=none`. Signed-off-by: ouyangxiangzhen <ouyangxiangzhen@xiaomi.com>
raiden00pl
approved these changes
Sep 13, 2024
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Summary
Intel CET (Control-flow Enforcement Technology) is a hardware enhancement aimed at mitigating the Retpoline vulnerability, but it may impact CPU branch prediction performance. This commit added ARCH_INTEL64_DISABLE_CET, which can disable CET completely with compilation option
-fcf-protection=none.Impact
ARCH_INTEL64_DISABLE_CET = ywill removeendbr64instructions from function entries.Testing
Tested on x86 QEMU, with assembly code examined using
objdump -S