diff mbox series

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

Message ID 76b91f88120fc8c3e5923d6432a1d537ee584fc8.1605046192.git.andreyknvl@google.com (mailing list archive)
State New, archived
Headers show
Series kasan: add hardware tag-based mode for arm64 | expand

Commit Message

Andrey Konovalov Nov. 10, 2020, 10:10 p.m. UTC 
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 <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
---
Change-Id: I51ebd3f9645e6330e5a92973bf7c86b62d632c2b
---
 arch/arm64/include/asm/cache.h | 3 +++
 1 file changed, 3 insertions(+)

Comments

Alexander Potapenko Nov. 11, 2020, 4:10 p.m. UTC | #1 
On Tue, Nov 10, 2020 at 11:12 PM Andrey Konovalov <andreyknvl@google.com> 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 <andreyknvl@google.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>

> ---
> 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
>
diff mbox series

Patch

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__