linux-kernel - [PATCH mm v10 34/42] kasan: define KASAN_GRANULE_SIZE for HW

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Message-Id: <67354d1e68484b547d222b8f0ef402887954be06.1605305705.git.andreyknvl@google.com>
Date:   Fri, 13 Nov 2020 23:16:02 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH mm v10 34/42] 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>
Reviewed-by: Marco Elver <elver@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.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 bc4f28156157..92cb2c16e314 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-kasan.h>
+#define KASAN_GRANULE_SIZE	MTE_GRANULE_SIZE
+#endif
+
 #define KASAN_GRANULE_MASK	(KASAN_GRANULE_SIZE - 1)
 
 #define KASAN_MEMORY_PER_SHADOW_PAGE	(KASAN_GRANULE_SIZE << PAGE_SHIFT)
-- 
2.29.2.299.gdc1121823c-goog