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x86/Kconfig: Add CONFIG_CALL_THUNKS 

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>
Link: https://lore.kernel.org/r/20220915111146.849523555@infradead.org
This commit is contained in:
Thomas Gleixner 2022-09-15 13:11:17 +02:00 committed by Peter Zijlstra
parent cb855971d7
commit 8f7c0d8b23
1 changed files with 8 additions and 0 deletions
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arch/x86/Kconfig
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@ -2446,6 +2446,14 @@ 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