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[mm,v4,16/39] kasan: define KASAN_VMALLOC_INVALID for SW_TAGS

Message ID b929882627e19a4a2d02c13788bd2d343f3e5573.1640036051.git.andreyknvl@google.com (mailing list archive)
State New
Headers show
Series kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS | expand

Commit Message

andrey.konovalov@linux.dev Dec. 20, 2021, 9:59 p.m. UTC 
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(-)

Comments

Alexander Potapenko Dec. 21, 2021, 9:23 a.m. UTC | #1 
On Mon, Dec 20, 2021 at 11:00 PM <andrey.konovalov@linux.dev> wrote:
>
> 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>
Reviewed-by: Alexander Potapenko <glider@google.com>
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Patch

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