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| author |   Thomas Gleixner <tglx@linutronix.de> | 2022-09-15 13:11:17 +0200 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-10-17 16:41:10 +0200 |
| commit | 8f7c0d8b23c3f5f740a48db31ebadef28af17a22 (patch) | |
| tree | 0a8ffceaa5e5ced02671727a3b95b41090f91288 | |
| parent | x86/putuser: Provide room for padding (diff) | |
| download | wireguard-linux-8f7c0d8b23c3f5f740a48db31ebadef28af17a22.tar.xz wireguard-linux-8f7c0d8b23c3f5f740a48db31ebadef28af17a22.zip | |
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
| -rw-r--r-- | arch/x86/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index f408fa87ed94..e18963e77cb1 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -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 |