2 files changed, 23 insertions, 1 deletions

diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index d8c474b6691e..9737059ec58b 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -113,6 +113,28 @@ config KASAN_INLINE
 
 endchoice
 
+config KASAN_STACK_ENABLE
+        bool "Enable stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST
+        default !(CLANG_VERSION < 90000)
+        depends on KASAN
+        help
+          The LLVM stack address sanitizer has a know problem that
+          causes excessive stack usage in a lot of functions, see
+          https://bugs.llvm.org/show_bug.cgi?id=38809
+          Disabling asan-stack makes it safe to run kernels build
+          with clang-8 with KASAN enabled, though it loses some of
+          the functionality.
+          This feature is always disabled when compile-testing with clang-8
+          or earlier to avoid cluttering the output in stack overflow
+          warnings, but clang-8 users can still enable it for builds without
+          CONFIG_COMPILE_TEST.  On gcc and later clang versions it is
+          assumed to always be safe to use and enabled by default.
+
+config KASAN_STACK
+        int
+        default 1 if KASAN_STACK_ENABLE || CC_IS_GCC
+        default 0
+
 config KASAN_S390_4_LEVEL_PAGING
         bool "KASan: use 4-level paging"
         depends on KASAN && S390
diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
index 25c259df8ffa..6deabedc67fc 100644
--- a/scripts/Makefile.kasan
+++ b/scripts/Makefile.kasan
@@ -26,7 +26,7 @@ else
         CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
          $(call cc-param,asan-globals=1) \
          $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
-         $(call cc-param,asan-stack=1) \
+         $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \
          $(call cc-param,asan-use-after-scope=1) \
          $(call cc-param,asan-instrument-allocas=1)
 endif