[15/31] kasan: define KASAN_VMALLOC_INVALID for SW_TAGS

Commit Message

[e-mail] Nov. 30, 2021, 10:06 p.m. UTC

From: Andrey Konovalov <[e-mail]>

In preparation for adding vmalloc support to SW_TAGS KASAN,
provide a KASAN_VMALLOC_INVALID definition for it.

HW_TAGS KASAN won't be using this value, as it falls back onto
page_alloc for poisoning freed vmalloc() memory.

Signed-off-by: Andrey Konovalov <[e-mail]>
---
 mm/kasan/kasan.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Patch

diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index a50450160638..0827d74d0d87 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -71,18 +71,19 @@  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_VMALLOC_INVALID   0xF8  /* unallocated space in vmapped page */
 #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_VMALLOC_INVALID   KASAN_TAG_INVALID /* only for SW_TAGS */
 #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 */
 
 /*
  * Stack redzone shadow values