kasan: Implementation of Kasan based on software tags.

Currently, only aarch64 is supported

Signed-off-by: wangmingrong <wangmingrong@xiaomi.com>

arch/arm64/src/Toolchain.defs

@@ -79,7 +79,11 @@ ifeq ($(CONFIG_MM_UBSAN_TRAP_ON_ERROR),y)
 endif
 
 ifeq ($(CONFIG_MM_KASAN_ALL),y)
-  ARCHOPTIMIZATION += -fsanitize=kernel-address
+  ifeq ($(CONFIG_MM_KASAN_GENERIC),y)
+    ARCHOPTIMIZATION += -fsanitize=kernel-address
+  else ifeq ($(CONFIG_MM_KASAN_SW_TAGS),y)
+    ARCHOPTIMIZATION += -fsanitize=kernel-hwaddress
+  endif
 endif
 
 ifeq ($(CONFIG_MM_KASAN_GLOBAL),y)

arch/arm64/src/common/arm64_mmu.c

@@ -153,6 +153,12 @@
 #define TCR_PS_BITS             TCR_PS_BITS_4GB
 #endif
 
+#ifdef CONFIG_MM_KASAN_SW_TAGS
+#define TCR_KASAN_SW_FLAGS (TCR_TBI0 | TCR_TBI1 | TCR_ASID_8)
+#else
+#define TCR_KASAN_SW_FLAGS 0
+#endif
+
 /****************************************************************************
  * Private Data
  ****************************************************************************/
@@ -254,7 +260,8 @@ static uint64_t get_tcr(int el)
    * inner shareable
    */
 
-  tcr |= TCR_TG0_4K | TCR_SHARED_INNER | TCR_ORGN_WBWA | TCR_IRGN_WBWA;
+  tcr |= TCR_TG0_4K | TCR_SHARED_INNER | TCR_ORGN_WBWA |
+         TCR_IRGN_WBWA | TCR_KASAN_SW_FLAGS;
 
   return tcr;
 }

arch/arm64/src/common/arm64_mmu.h

@@ -149,6 +149,12 @@
 #define TCR_TG0_16K                 (2ULL << 14)
 #define TCR_EPD1_DISABLE            (1ULL << 23)
 
+#define TCR_AS_SHIFT                36U
+#define TCR_ASID_8                  (0ULL << TCR_AS_SHIFT)
+#define TCR_ASID_16                 (1ULL << TCR_AS_SHIFT)
+#define TCR_TBI0                    (1ULL << 37)
+#define TCR_TBI1                    (1ULL << 38)
+
 #define TCR_PS_BITS_4GB             0x0ULL
 #define TCR_PS_BITS_64GB            0x1ULL
 #define TCR_PS_BITS_1TB             0x2ULL