Thread (107 messages) 107 messages, 6 authors, 2020-11-13

Re: [PATCH v9 34/44] arm64: kasan: Align allocations for HW_TAGS

From: Alexander Potapenko <glider@google.com>
Date: 2020-11-11 16:11:05
Also in: linux-mm, lkml

On Tue, Nov 10, 2020 at 11:12 PM Andrey Konovalov [off-list ref] wrote:
Hardware tag-based KASAN uses the memory tagging approach, which requires
all allocations to be aligned to the memory granule size. Align the
allocations to MTE_GRANULE_SIZE via ARCH_SLAB_MINALIGN when
CONFIG_KASAN_HW_TAGS is enabled.

Signed-off-by: Andrey Konovalov <redacted>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
quoted hunk ↗ jump to hunk
---
Change-Id: I51ebd3f9645e6330e5a92973bf7c86b62d632c2b
---
 arch/arm64/include/asm/cache.h | 3 +++
 1 file changed, 3 insertions(+)
diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h
index 63d43b5f82f6..77cbbe3625f2 100644
--- a/arch/arm64/include/asm/cache.h
+++ b/arch/arm64/include/asm/cache.h
@@ -6,6 +6,7 @@
 #define __ASM_CACHE_H

 #include <asm/cputype.h>
+#include <asm/mte-kasan.h>

 #define CTR_L1IP_SHIFT         14
 #define CTR_L1IP_MASK          3
@@ -51,6 +52,8 @@

 #ifdef CONFIG_KASAN_SW_TAGS
 #define ARCH_SLAB_MINALIGN     (1ULL << KASAN_SHADOW_SCALE_SHIFT)
+#elif defined(CONFIG_KASAN_HW_TAGS)
+#define ARCH_SLAB_MINALIGN     MTE_GRANULE_SIZE
 #endif

 #ifndef __ASSEMBLY__
--
2.29.2.222.g5d2a92d10f8-goog

-- 
Alexander Potapenko
Software Engineer

Google Germany GmbH
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80636 München

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