From: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Subject: kasan: allow enabling stack tagging for tag-based mode 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 Link: http://lkml.kernel.org/r/e7febb907b539c3730780df587ce0b38dc558c3d.1596199677.git.andreyknvl@xxxxxxxxxx Link: http://lkml.kernel.org/r/99f7d90a4237431bf5988599fb41358e92876eb0.1596544734.git.andreyknvl@xxxxxxxxxx Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Elena Petrova <lenaptr@xxxxxxxxxx> Cc: Marco Elver <elver@xxxxxxxxxx> Cc: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> Cc: Walter Wu <walter-zh.wu@xxxxxxxxxxxx> Cc: Ard Biesheuvel <ardb@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- scripts/Makefile.kasan | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/scripts/Makefile.kasan~kasan-allow-enabling-stack-tagging-for-tag-based-mode +++ a/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 _
