linux-kernel - [PATCH v2 30/37] kasan: define KASAN_GRANULE_SIZE for HW

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Date:   Tue, 15 Sep 2020 23:16:12 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev@...glegroups.com
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH v2 30/37] kasan: define KASAN_GRANULE_SIZE for HW_TAGS

Hardware tag-based KASAN has granules of MTE_GRANULE_SIZE. Define
KASAN_GRANULE_SIZE to MTE_GRANULE_SIZE for CONFIG_KASAN_HW_TAGS.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
---
Change-Id: I5d1117e6a991cbca00d2cfb4ba66e8ae2d8f513a
---
 mm/kasan/kasan.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 8b43fc163ed1..ba63d8a62968 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -5,7 +5,13 @@
 #include <linux/kasan.h>
 #include <linux/stackdepot.h>
 
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
 #define KASAN_GRANULE_SIZE	(1UL << KASAN_SHADOW_SCALE_SHIFT)
+#else
+#include <asm/mte-helpers.h>
+#define KASAN_GRANULE_SIZE	(MTE_GRANULE_SIZE)
+#endif
+
 #define KASAN_GRANULE_MASK	(KASAN_GRANULE_SIZE - 1)
 
 #define KASAN_TAG_KERNEL	0xFF /* native kernel pointers tag */
-- 
2.28.0.618.gf4bc123cb7-goog