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    Subject[PATCH mm v4 16/39] kasan: define KASAN_VMALLOC_INVALID for SW_TAGS
    Date
    From: Andrey Konovalov <andreyknvl@google.com>

    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 <andreyknvl@google.com>
    ---
    mm/kasan/kasan.h | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
    index 952cd6f9ca46..020f3e57a03f 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
    --
    2.25.1
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