Re: [PATCH 28/35] kasan: define KASAN_GRANULE_SIZE for HW_TAGS
From: Vincenzo Frascino <vincenzo.frascino@arm.com>
Date: 2020-08-27 15:23:19
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On 8/27/20 11:41 AM, Catalin Marinas wrote:
On Fri, Aug 14, 2020 at 07:27:10PM +0200, Andrey Konovalov wrote:quoted
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 <redacted> --- mm/kasan/kasan.h | 6 ++++++ 1 file changed, 6 insertions(+)diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 1d3c7c6ce771..4d8e229f8e01 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.h>You could only include the new asm/mte-def.h file (currently mte_asm.h).
Agreed, we should only include asm/mte-def.h here since after the suggested modification will be sufficient for the purpose.
quoted
+#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 */ -- 2.28.0.220.ged08abb693-goog
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