text: /* SPDX-License-Identifier: GPL-2.0 */
  #ifndef __MM_KASAN_KASAN_H
  #define __MM_KASAN_KASAN_H
  
  #include <linux/kasan.h>
  #include <linux/stackdepot.h>
  
  #define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
  #define KASAN_SHADOW_MASK       (KASAN_SHADOW_SCALE_SIZE - 1)
  
  #define KASAN_TAG_KERNEL	0xFF /* native kernel pointers tag */
  #define KASAN_TAG_INVALID	0xFE /* inaccessible memory tag */
  #define KASAN_TAG_MAX		0xFD /* maximum value for random tags */
  
  #ifdef CONFIG_KASAN_GENERIC
  #define KASAN_FREE_PAGE         0xFF  /* page was freed */
  #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) */
  #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
  #endif
  
  #define KASAN_GLOBAL_REDZONE    0xFA  /* redzone for global variable */
  
  /*
   * Stack redzone shadow values
   * (Those are compiler's ABI, don't change them)
   */
  #define KASAN_STACK_LEFT        0xF1
  #define KASAN_STACK_MID         0xF2
  #define KASAN_STACK_RIGHT       0xF3
  #define KASAN_STACK_PARTIAL     0xF4
  
  /*
   * alloca redzone shadow values
   */
  #define KASAN_ALLOCA_LEFT	0xCA
  #define KASAN_ALLOCA_RIGHT	0xCB
  
  #define KASAN_ALLOCA_REDZONE_SIZE	32
  
  /*
   * Stack frame marker (compiler ABI).
   */
  #define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3
  
  /* Don't break randconfig/all*config builds */
  #ifndef KASAN_ABI_VERSION
  #define KASAN_ABI_VERSION 1
  #endif
  
  struct kasan_access_info {
  	const void *access_addr;
  	const void *first_bad_addr;
  	size_t access_size;
  	bool is_write;
  	unsigned long ip;
  };
  
  /* The layout of struct dictated by compiler */
  struct kasan_source_location {
  	const char *filename;
  	int line_no;
  	int column_no;
  };
  
  /* The layout of struct dictated by compiler */
  struct kasan_global {
  	const void *beg;		/* Address of the beginning of the global variable. */
  	size_t size;			/* Size of the global variable. */
  	size_t size_with_redzone;	/* Size of the variable + size of the red zone. 32 bytes aligned */
  	const void *name;
  	const void *module_name;	/* Name of the module where the global variable is declared. */
  	unsigned long has_dynamic_init;	/* This needed for C++ */
  #if KASAN_ABI_VERSION >= 4
  	struct kasan_source_location *location;
  #endif
  #if KASAN_ABI_VERSION >= 5
  	char *odr_indicator;
  #endif
  };
  
  /**
   * Structures to keep alloc and free tracks *
   */
  
  #define KASAN_STACK_DEPTH 64
  
  struct kasan_track {
  	u32 pid;
  	depot_stack_handle_t stack;
  };
  
  #ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY
  #define KASAN_NR_FREE_STACKS 5
  #else
  #define KASAN_NR_FREE_STACKS 1
  #endif
  
  struct kasan_alloc_meta {
  	struct kasan_track alloc_track;
  	struct kasan_track free_track[KASAN_NR_FREE_STACKS];
  #ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY
  	u8 free_pointer_tag[KASAN_NR_FREE_STACKS];
  	u8 free_track_idx;
  #endif
  };
  
  struct qlist_node {
  	struct qlist_node *next;
  };
  struct kasan_free_meta {
  	/* This field is used while the object is in the quarantine.
  	 * Otherwise it might be used for the allocator freelist.
  	 */
  	struct qlist_node quarantine_link;
  };
  
  struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
  					const void *object);
  struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
  					const void *object);
  
  static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
  {
  	return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
  		<< KASAN_SHADOW_SCALE_SHIFT);
  }
  
  static inline bool addr_has_shadow(const void *addr)
  {
  	return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
  }
  
  void kasan_poison_shadow(const void *address, size_t size, u8 value);
  
  /**
   * check_memory_region - Check memory region, and report if invalid access.
   * @addr: the accessed address
   * @size: the accessed size
   * @write: true if access is a write access
   * @ret_ip: return address
   * @return: true if access was valid, false if invalid
   */
  bool check_memory_region(unsigned long addr, size_t size, bool write,
  				unsigned long ret_ip);
  
  void *find_first_bad_addr(void *addr, size_t size);
  const char *get_bug_type(struct kasan_access_info *info);
  
  void kasan_report(unsigned long addr, size_t size,
  		bool is_write, unsigned long ip);
  void kasan_report_invalid_free(void *object, unsigned long ip);
  
  struct page *kasan_addr_to_page(const void *addr);
  
  #if defined(CONFIG_KASAN_GENERIC) && \
  	(defined(CONFIG_SLAB) || defined(CONFIG_SLUB))
  void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
  void quarantine_reduce(void);
  void quarantine_remove_cache(struct kmem_cache *cache);
  #else
  static inline void quarantine_put(struct kasan_free_meta *info,
  				struct kmem_cache *cache) { }
  static inline void quarantine_reduce(void) { }
  static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
  #endif
  
  #ifdef CONFIG_KASAN_SW_TAGS
  
  void print_tags(u8 addr_tag, const void *addr);
  
  u8 random_tag(void);
  
  #else
  
  static inline void print_tags(u8 addr_tag, const void *addr) { }
  
  static inline u8 random_tag(void)
  {
  	return 0;
  }
  
  #endif
  
  #ifndef arch_kasan_set_tag
  static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
  {
  	return addr;
  }
  #endif
  #ifndef arch_kasan_reset_tag
  #define arch_kasan_reset_tag(addr)	((void *)(addr))
  #endif
  #ifndef arch_kasan_get_tag
  #define arch_kasan_get_tag(addr)	0
  #endif
  
  #define set_tag(addr, tag)	((void *)arch_kasan_set_tag((addr), (tag)))
  #define reset_tag(addr)		((void *)arch_kasan_reset_tag(addr))
  #define get_tag(addr)		arch_kasan_get_tag(addr)
  
  /*
   * Exported functions for interfaces called from assembly or from generated
   * code. Declarations here to avoid warning about missing declarations.
   */
  asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
  void __asan_register_globals(struct kasan_global *globals, size_t size);
  void __asan_unregister_globals(struct kasan_global *globals, size_t size);
  void __asan_loadN(unsigned long addr, size_t size);
  void __asan_storeN(unsigned long addr, size_t size);
  void __asan_handle_no_return(void);
  void __asan_alloca_poison(unsigned long addr, size_t size);
  void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom);
  
  void __asan_load1(unsigned long addr);
  void __asan_store1(unsigned long addr);
  void __asan_load2(unsigned long addr);
  void __asan_store2(unsigned long addr);
  void __asan_load4(unsigned long addr);
  void __asan_store4(unsigned long addr);
  void __asan_load8(unsigned long addr);
  void __asan_store8(unsigned long addr);
  void __asan_load16(unsigned long addr);
  void __asan_store16(unsigned long addr);
  
  void __asan_load1_noabort(unsigned long addr);
  void __asan_store1_noabort(unsigned long addr);
  void __asan_load2_noabort(unsigned long addr);
  void __asan_store2_noabort(unsigned long addr);
  void __asan_load4_noabort(unsigned long addr);
  void __asan_store4_noabort(unsigned long addr);
  void __asan_load8_noabort(unsigned long addr);
  void __asan_store8_noabort(unsigned long addr);
  void __asan_load16_noabort(unsigned long addr);
  void __asan_store16_noabort(unsigned long addr);
  
  void __asan_set_shadow_00(const void *addr, size_t size);
  void __asan_set_shadow_f1(const void *addr, size_t size);
  void __asan_set_shadow_f2(const void *addr, size_t size);
  void __asan_set_shadow_f3(const void *addr, size_t size);
  void __asan_set_shadow_f5(const void *addr, size_t size);
  void __asan_set_shadow_f8(const void *addr, size_t size);
  
  #endif
  