diff mbox series

[v2,29/37] arm64: kasan: Align allocations for HW_TAGS

Message ID 0845668a82ddd3eeb3f652712597ffd056f97504.1600204505.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 Sept. 15, 2020, 9:16 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>
---
Change-Id: I51ebd3f9645e6330e5a92973bf7c86b62d632c2b
---
 arch/arm64/include/asm/cache.h | 3 +++
 1 file changed, 3 insertions(+)

Comments

Catalin Marinas Sept. 17, 2020, 5:06 p.m. UTC | #1 
On Tue, Sep 15, 2020 at 11:16:11PM +0200, Andrey Konovalov 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>
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h
index a4d1b5f771f6..acf6a5097cce 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-helpers.h>
 
 #define CTR_L1IP_SHIFT		14
 #define CTR_L1IP_MASK		3
@@ -50,6 +51,8 @@ 
 
 #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__