linux-kernel - [PATCH 3/4] kasan: allow enabling stack tagging for tag-based mode

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Message-Id: <e7febb907b539c3730780df587ce0b38dc558c3d.1596199677.git.andreyknvl@google.com>
Date:   Fri, 31 Jul 2020 15:20:40 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Marco Elver <elver@...gle.com>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Walter Wu <walter-zh.wu@...iatek.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 3/4] 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

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

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
-- 
2.28.0.163.g6104cc2f0b6-goog