Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
new file mode 100644
index 000000000..69552a399
--- /dev/null
+++ b/scripts/Makefile.kasan
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: GPL-2.0
+ifdef CONFIG_KASAN
+ifdef CONFIG_KASAN_INLINE
+	call_threshold := 10000
+else
+	call_threshold := 0
+endif
+
+KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
+
+CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
+
+cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
+
+ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
+   ifneq ($(CONFIG_COMPILE_TEST),y)
+        $(warning Cannot use CONFIG_KASAN: \
+            -fsanitize=kernel-address is not supported by compiler)
+   endif
+else
+   # -fasan-shadow-offset fails without -fsanitize
+   CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
+			-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
+			$(call cc-option, -fsanitize=kernel-address \
+			-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
+
+   ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
+      CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
+   else
+      # Now add all the compiler specific options that are valid standalone
+      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-use-after-scope=1) \
+	$(call cc-param,asan-instrument-allocas=1)
+   endif
+
+endif
+
+ifdef CONFIG_KASAN_EXTRA
+CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
+endif
+
+CFLAGS_KASAN_NOSANITIZE := -fno-builtin
+
+endif