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From: Andrey Konovalov <andreyknvl@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	 Dmitry Vyukov <dvyukov@google.com>,
	Marco Elver <elver@google.com>,
	kasan-dev@googlegroups.com,  linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	 Walter Wu <walter-zh.wu@mediatek.com>,
	Elena Petrova <lenaptr@google.com>,
	 Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	 Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH 3/4] kasan: allow enabling stack tagging for tag-based mode
Date: Fri, 31 Jul 2020 15:20:40 +0200	[thread overview]
Message-ID: <e7febb907b539c3730780df587ce0b38dc558c3d.1596199677.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1596199677.git.andreyknvl@google.com>

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(-)

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



  parent reply	other threads:[~2020-07-31 13:20 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-31 13:20 [PATCH 0/4] kasan: support stack instrumentation for tag-based mode Andrey Konovalov
2020-07-31 13:20 ` [PATCH 1/4] kasan: don't tag stacks allocated with pagealloc Andrey Konovalov
2020-07-31 13:20 ` [PATCH 2/4] kasan, arm64: don't instrument functions that enable kasan Andrey Konovalov
2020-07-31 14:21   ` Catalin Marinas
2020-07-31 13:20 ` Andrey Konovalov [this message]
2020-07-31 13:20 ` [PATCH 4/4] kasan: adjust kasan_stack_oob for tag-based mode Andrey Konovalov

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