From c75886b8f8afabef83da96821d8a34111b4b5e83 Mon Sep 17 00:00:00 2001
From: ligd <liguiding1@xiaomi.com>
Date: Mon, 8 Jan 2024 15:46:50 +0800
Subject: [PATCH] kasan: add new API kasan_init_early()

Signed-off-by: ligd <liguiding1@xiaomi.com>
---
 mm/kasan/kasan.c |  5 +++++
 mm/kasan/kasan.h | 19 +++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 277323bad6..5f26277db6 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -324,6 +324,11 @@ void kasan_register(FAR void *addr, FAR size_t *size)
   *size -= KASAN_REGION_SIZE(*size);
 }
 
+void kasan_init_early(void)
+{
+  g_region_init = 0;
+}
+
 /* Exported functions called from the compiler generated code */
 
 void __sanitizer_annotate_contiguous_container(FAR const void *beg,
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index c6fd07ccc6..28eb544f8a 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -35,6 +35,7 @@
 #  define kasan_poison(addr, size)
 #  define kasan_unpoison(addr, size)
 #  define kasan_register(addr, size)
+#  define kasan_init_early()
 #endif
 
 /****************************************************************************
@@ -105,6 +106,24 @@ void kasan_unpoison(FAR const void *addr, size_t size);
 
 void kasan_register(FAR void *addr, FAR size_t *size);
 
+/****************************************************************************
+ * Name: kasan_init_early
+ *
+ * Description:
+ *   Initialize the kasan early, setup g_region_init variable.
+ *   This used for some platfroms clear bss late, and error use kasan before
+ *   called kasan_register().
+ *
+ * Input Parameters:
+ *   None.
+ *
+ * Returned Value:
+ *   None.
+ *
+ ****************************************************************************/
+
+void kasan_init_early(void);
+
 #endif /* CONFIG_MM_KASAN */
 
 #undef EXTERN