[PATCH 14/31] kasan: clean up metadata byte definitions
andrey.konovalov at linux.dev
andrey.konovalov at linux.dev
Tue Nov 30 14:06:36 PST 2021
From: Andrey Konovalov <andreyknvl at google.com>
Most of the metadata byte values are only used for Generic KASAN.
Remove KASAN_KMALLOC_FREETRACK definition for !CONFIG_KASAN_GENERIC
case, and put it along with other metadata values for the Generic
mode under a corresponding ifdef.
Signed-off-by: Andrey Konovalov <andreyknvl at google.com>
---
mm/kasan/kasan.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index aebd8df86a1f..a50450160638 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -71,15 +71,16 @@ static inline bool kasan_sync_fault_possible(void)
#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
-#define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */
#else
#define KASAN_FREE_PAGE KASAN_TAG_INVALID
#define KASAN_PAGE_REDZONE KASAN_TAG_INVALID
#define KASAN_KMALLOC_REDZONE KASAN_TAG_INVALID
#define KASAN_KMALLOC_FREE KASAN_TAG_INVALID
-#define KASAN_KMALLOC_FREETRACK KASAN_TAG_INVALID
#endif
+#ifdef CONFIG_KASAN_GENERIC
+
+#define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */
#define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */
#define KASAN_VMALLOC_INVALID 0xF8 /* unallocated space in vmapped page */
@@ -110,6 +111,8 @@ static inline bool kasan_sync_fault_possible(void)
#define KASAN_ABI_VERSION 1
#endif
+#endif /* CONFIG_KASAN_GENERIC */
+
/* Metadata layout customization. */
#define META_BYTES_PER_BLOCK 1
#define META_BLOCKS_PER_ROW 16
--
2.25.1
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