v4.19.13 snapshot.
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
new file mode 100644
index 0000000..46aae12
--- /dev/null
+++ b/include/linux/kasan.h
@@ -0,0 +1,143 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_KASAN_H
+#define _LINUX_KASAN_H
+
+#include <linux/types.h>
+
+struct kmem_cache;
+struct page;
+struct vm_struct;
+struct task_struct;
+
+#ifdef CONFIG_KASAN
+
+#include <asm/kasan.h>
+#include <asm/pgtable.h>
+
+extern unsigned char kasan_zero_page[PAGE_SIZE];
+extern pte_t kasan_zero_pte[PTRS_PER_PTE];
+extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
+extern pud_t kasan_zero_pud[PTRS_PER_PUD];
+extern p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D];
+
+int kasan_populate_zero_shadow(const void *shadow_start,
+ const void *shadow_end);
+
+static inline void *kasan_mem_to_shadow(const void *addr)
+{
+ return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
+ + KASAN_SHADOW_OFFSET;
+}
+
+/* Enable reporting bugs after kasan_disable_current() */
+extern void kasan_enable_current(void);
+
+/* Disable reporting bugs for current task */
+extern void kasan_disable_current(void);
+
+void kasan_unpoison_shadow(const void *address, size_t size);
+
+void kasan_unpoison_task_stack(struct task_struct *task);
+void kasan_unpoison_stack_above_sp_to(const void *watermark);
+
+void kasan_alloc_pages(struct page *page, unsigned int order);
+void kasan_free_pages(struct page *page, unsigned int order);
+
+void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
+ slab_flags_t *flags);
+void kasan_cache_shrink(struct kmem_cache *cache);
+void kasan_cache_shutdown(struct kmem_cache *cache);
+
+void kasan_poison_slab(struct page *page);
+void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
+void kasan_poison_object_data(struct kmem_cache *cache, void *object);
+void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
+
+void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
+void kasan_kfree_large(void *ptr, unsigned long ip);
+void kasan_poison_kfree(void *ptr, unsigned long ip);
+void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
+ gfp_t flags);
+void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
+
+void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
+bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
+
+struct kasan_cache {
+ int alloc_meta_offset;
+ int free_meta_offset;
+};
+
+int kasan_module_alloc(void *addr, size_t size);
+void kasan_free_shadow(const struct vm_struct *vm);
+
+int kasan_add_zero_shadow(void *start, unsigned long size);
+void kasan_remove_zero_shadow(void *start, unsigned long size);
+
+size_t ksize(const void *);
+static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
+size_t kasan_metadata_size(struct kmem_cache *cache);
+
+bool kasan_save_enable_multi_shot(void);
+void kasan_restore_multi_shot(bool enabled);
+
+#else /* CONFIG_KASAN */
+
+static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
+
+static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
+static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
+
+static inline void kasan_enable_current(void) {}
+static inline void kasan_disable_current(void) {}
+
+static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
+static inline void kasan_free_pages(struct page *page, unsigned int order) {}
+
+static inline void kasan_cache_create(struct kmem_cache *cache,
+ unsigned int *size,
+ slab_flags_t *flags) {}
+static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
+static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
+
+static inline void kasan_poison_slab(struct page *page) {}
+static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
+ void *object) {}
+static inline void kasan_poison_object_data(struct kmem_cache *cache,
+ void *object) {}
+static inline void kasan_init_slab_obj(struct kmem_cache *cache,
+ const void *object) {}
+
+static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
+static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
+static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
+static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
+ size_t size, gfp_t flags) {}
+static inline void kasan_krealloc(const void *object, size_t new_size,
+ gfp_t flags) {}
+
+static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
+ gfp_t flags) {}
+static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
+ unsigned long ip)
+{
+ return false;
+}
+
+static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
+static inline void kasan_free_shadow(const struct vm_struct *vm) {}
+
+static inline int kasan_add_zero_shadow(void *start, unsigned long size)
+{
+ return 0;
+}
+static inline void kasan_remove_zero_shadow(void *start,
+ unsigned long size)
+{}
+
+static inline void kasan_unpoison_slab(const void *ptr) { }
+static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
+
+#endif /* CONFIG_KASAN */
+
+#endif /* LINUX_KASAN_H */