lkml.org 
[lkml]   [2022]   [Jul]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[patch 14/38] x86/Kconfig: Add CONFIG_CALL_THUNKS
Date
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>
---
arch/x86/Kconfig | 8 ++++++++
1 file changed, 8 insertions(+)

--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2439,6 +2439,14 @@ 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 MODULE_ALLOC
+
menuconfig SPECULATION_MITIGATIONS
bool "Mitigations for speculative execution vulnerabilities"
default y
\
 
 \ /
  Last update: 2022-07-17 01:18    [W:0.351 / U:0.588 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site