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 25 /* Don't break randconfig/all*config builds */ 26 #ifndef KASAN_ABI_VERSION 27 #define KASAN_ABI_VERSION 1 28 #endif 29 30 struct kasan_access_info { 31 const void *access_addr; 32 const void *first_bad_addr; 33 size_t access_size; 34 bool is_write; 35 unsigned long ip; 36 }; 37 38 /* The layout of struct dictated by compiler */ 39 struct kasan_source_location { 40 const char *filename; 41 int line_no; 42 int column_no; 43 }; 44 45 /* The layout of struct dictated by compiler */ 46 struct kasan_global { 47 const void *beg; /* Address of the beginning of the global variable. */ 48 size_t size; /* Size of the global variable. */ 49 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */ 50 const void *name; 51 const void *module_name; /* Name of the module where the global variable is declared. */ 52 unsigned long has_dynamic_init; /* This needed for C++ */ 53 #if KASAN_ABI_VERSION >= 4 54 struct kasan_source_location *location; 55 #endif 56 }; 57 58 /** 59 * Structures to keep alloc and free tracks * 60 */ 61 62 enum kasan_state { 63 KASAN_STATE_INIT, 64 KASAN_STATE_ALLOC, 65 KASAN_STATE_QUARANTINE, 66 KASAN_STATE_FREE 67 }; 68 69 #define KASAN_STACK_DEPTH 64 70 71 struct kasan_track { 72 u32 pid; 73 depot_stack_handle_t stack; 74 }; 75 76 struct kasan_alloc_meta { 77 struct kasan_track track; 78 u32 state : 2; /* enum kasan_state */ 79 u32 alloc_size : 30; 80 }; 81 82 struct qlist_node { 83 struct qlist_node *next; 84 }; 85 struct kasan_free_meta { 86 /* This field is used while the object is in the quarantine. 87 * Otherwise it might be used for the allocator freelist. 88 */ 89 struct qlist_node quarantine_link; 90 struct kasan_track track; 91 }; 92 93 struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache, 94 const void *object); 95 struct kasan_free_meta *get_free_info(struct kmem_cache *cache, 96 const void *object); 97 98 99 static inline const void *kasan_shadow_to_mem(const void *shadow_addr) 100 { 101 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) 102 << KASAN_SHADOW_SCALE_SHIFT); 103 } 104 105 static inline bool kasan_report_enabled(void) 106 { 107 return !current->kasan_depth; 108 } 109 110 void kasan_report(unsigned long addr, size_t size, 111 bool is_write, unsigned long ip); 112 113 #ifdef CONFIG_SLAB 114 void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache); 115 void quarantine_reduce(void); 116 void quarantine_remove_cache(struct kmem_cache *cache); 117 #else 118 static inline void quarantine_put(struct kasan_free_meta *info, 119 struct kmem_cache *cache) { } 120 static inline void quarantine_reduce(void) { } 121 static inline void quarantine_remove_cache(struct kmem_cache *cache) { } 122 #endif 123 124 #endif 125