| Date | Thu, 15 Sep 2022 13:11:17 +0200 | From | Peter Zijlstra <> | Subject | [PATCH v3 38/59] x86/Kconfig: Add CONFIG_CALL_THUNKS |
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From: Thomas Gleixner <tglx@linutronix.de>
In preparation for mitigating the Intel SKL RSB underflow issue in software, add a new configuration symbol which allows to build the required call thunk infrastructure conditionally.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- arch/x86/Kconfig | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2429,6 +2429,14 @@ config CC_HAS_SLS config CC_HAS_RETURN_THUNK def_bool $(cc-option,-mfunction-return=thunk-extern) +config HAVE_CALL_THUNKS + def_bool y + depends on RETHUNK && OBJTOOL + +config CALL_THUNKS + def_bool n + select FUNCTION_ALIGNMENT_16B + menuconfig SPECULATION_MITIGATIONS bool "Mitigations for speculative execution vulnerabilities" default y
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