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[v2,4/5] kasan: allow enabling stack tagging for tag-based mode

Message ID 99f7d90a4237431bf5988599fb41358e92876eb0.1596544734.git.andreyknvl@google.com
State New
Headers show
Series kasan: support stack instrumentation for tag-based mode | expand

Commit Message

Andrey Konovalov Aug. 4, 2020, 12:41 p.m. UTC
Use CONFIG_KASAN_STACK to enable stack tagging.

Note, that HWASAN short granules [1] are disabled. Supporting those will
require more kernel changes.

[1] https://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 scripts/Makefile.kasan | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
index 03757cc60e06..f4beee1b0013 100644
--- a/scripts/Makefile.kasan
+++ b/scripts/Makefile.kasan
@@ -44,7 +44,8 @@  else
 endif
 
 CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
-		-mllvm -hwasan-instrument-stack=0 \
+		-mllvm -hwasan-instrument-stack=$(CONFIG_KASAN_STACK) \
+		-mllvm -hwasan-use-short-granules=0 \
 		$(instrumentation_flags)
 
 endif # CONFIG_KASAN_SW_TAGS