[PATCH v4 11/17] arm64: disable function graph tracing with SCS

[Sami Tolvanen]

With CONFIG_FUNCTION_GRAPH_TRACER, function return addresses are
modified in ftrace_graph_caller and prepare_ftrace_return to redirect
control flow to ftrace_return_to_handler. This is incompatible with
SCS.

Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 arch/arm64/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e7b57a8a5531..42867174920f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -148,7 +148,7 @@ config ARM64
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_ERROR_INJECTION
-	select HAVE_FUNCTION_GRAPH_TRACER
+	select HAVE_FUNCTION_GRAPH_TRACER if !SHADOW_CALL_STACK
 	select HAVE_GCC_PLUGINS
 	select HAVE_HW_BREAKPOINT if PERF_EVENTS
 	select HAVE_IRQ_TIME_ACCOUNTING
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog