1 #ifndef __MM_KASAN_KASAN_H 2 #define __MM_KASAN_KASAN_H 3 4 #include <linux/kasan.h> 5 #include <linux/stackdepot.h> 6 7 #define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT) 8 #define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1) 9 10 #define KASAN_FREE_PAGE 0xFF /* page was freed */ 11 #define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ 12 #define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */ 13 #define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */ 14 #define KASAN_GLOBAL_REDZONE 0xFA /* redzone for global variable */ 15 16 /* 17 * Stack redzone shadow values 18 * (Those are compiler's ABI, don't change them) 19 */ 20 #define KASAN_STACK_LEFT 0xF1 21 #define KASAN_STACK_MID 0xF2 22 #define KASAN_STACK_RIGHT 0xF3 23 #define KASAN_STACK_PARTIAL 0xF4 24 #define KASAN_USE_AFTER_SCOPE 0xF8 25 26 /* Don't break randconfig/all*config builds */ 27 #ifndef KASAN_ABI_VERSION 28 #define KASAN_ABI_VERSION 1 29 #endif 30 31 struct kasan_access_info { 32 const void *access_addr; 33 const void *first_bad_addr; 34 size_t access_size; 35 bool is_write; 36 unsigned long ip; 37 }; 38 39 /* The layout of struct dictated by compiler */ 40 struct kasan_source_location { 41 const char *filename; 42 int line_no; 43 int column_no; 44 }; 45 46 /* The layout of struct dictated by compiler */ 47 struct kasan_global { 48 const void *beg; /* Address of the beginning of the global variable. */ 49 size_t size; /* Size of the global variable. */ 50 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */ 51 const void *name; 52 const void *module_name; /* Name of the module where the global variable is declared. */ 53 unsigned long has_dynamic_init; /* This needed for C++ */ 54 #if KASAN_ABI_VERSION >= 4 55 struct kasan_source_location *location; 56 #endif 57 #if KASAN_ABI_VERSION >= 5 58 char *odr_indicator; 59 #endif 60 }; 61 62 /** 63 * Structures to keep alloc and free tracks * 64 */ 65 66 #define KASAN_STACK_DEPTH 64 67 68 struct kasan_track { 69 u32 pid; 70 depot_stack_handle_t stack; 71 }; 72 73 struct kasan_alloc_meta { 74 struct kasan_track alloc_track; 75 struct kasan_track free_track; 76 }; 77 78 struct qlist_node { 79 struct qlist_node *next; 80 }; 81 struct kasan_free_meta { 82 /* This field is used while the object is in the quarantine. 83 * Otherwise it might be used for the allocator freelist. 84 */ 85 struct qlist_node quarantine_link; 86 }; 87 88 struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache, 89 const void *object); 90 struct kasan_free_meta *get_free_info(struct kmem_cache *cache, 91 const void *object); 92 93 static inline const void *kasan_shadow_to_mem(const void *shadow_addr) 94 { 95 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) 96 << KASAN_SHADOW_SCALE_SHIFT); 97 } 98 99 void kasan_report(unsigned long addr, size_t size, 100 bool is_write, unsigned long ip); 101 void kasan_report_double_free(struct kmem_cache *cache, void *object, 102 void *ip); 103 104 #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB) 105 void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache); 106 void quarantine_reduce(void); 107 void quarantine_remove_cache(struct kmem_cache *cache); 108 #else 109 static inline void quarantine_put(struct kasan_free_meta *info, 110 struct kmem_cache *cache) { } 111 static inline void quarantine_reduce(void) { } 112 static inline void quarantine_remove_cache(struct kmem_cache *cache) { } 113 #endif 114 115 #endif 116