1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_KASAN_H 3 #define _LINUX_KASAN_H 4 5 #include <linux/types.h> 6 7 struct kmem_cache; 8 struct page; 9 struct vm_struct; 10 struct task_struct; 11 12 #ifdef CONFIG_KASAN 13 14 #include <asm/kasan.h> 15 #include <asm/pgtable.h> 16 17 extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; 18 extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE]; 19 extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD]; 20 extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD]; 21 extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D]; 22 23 int kasan_populate_early_shadow(const void *shadow_start, 24 const void *shadow_end); 25 26 static inline void *kasan_mem_to_shadow(const void *addr) 27 { 28 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT) 29 + KASAN_SHADOW_OFFSET; 30 } 31 32 /* Enable reporting bugs after kasan_disable_current() */ 33 extern void kasan_enable_current(void); 34 35 /* Disable reporting bugs for current task */ 36 extern void kasan_disable_current(void); 37 38 void kasan_unpoison_shadow(const void *address, size_t size); 39 40 void kasan_unpoison_task_stack(struct task_struct *task); 41 void kasan_unpoison_stack_above_sp_to(const void *watermark); 42 43 void kasan_alloc_pages(struct page *page, unsigned int order); 44 void kasan_free_pages(struct page *page, unsigned int order); 45 46 void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, 47 slab_flags_t *flags); 48 49 void kasan_poison_slab(struct page *page); 50 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object); 51 void kasan_poison_object_data(struct kmem_cache *cache, void *object); 52 void * __must_check kasan_init_slab_obj(struct kmem_cache *cache, 53 const void *object); 54 55 void * __must_check kasan_kmalloc_large(const void *ptr, size_t size, 56 gfp_t flags); 57 void kasan_kfree_large(void *ptr, unsigned long ip); 58 void kasan_poison_kfree(void *ptr, unsigned long ip); 59 void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object, 60 size_t size, gfp_t flags); 61 void * __must_check kasan_krealloc(const void *object, size_t new_size, 62 gfp_t flags); 63 64 void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object, 65 gfp_t flags); 66 bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip); 67 68 struct kasan_cache { 69 int alloc_meta_offset; 70 int free_meta_offset; 71 }; 72 73 int kasan_module_alloc(void *addr, size_t size); 74 void kasan_free_shadow(const struct vm_struct *vm); 75 76 int kasan_add_zero_shadow(void *start, unsigned long size); 77 void kasan_remove_zero_shadow(void *start, unsigned long size); 78 79 size_t ksize(const void *); 80 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); } 81 size_t kasan_metadata_size(struct kmem_cache *cache); 82 83 bool kasan_save_enable_multi_shot(void); 84 void kasan_restore_multi_shot(bool enabled); 85 86 #else /* CONFIG_KASAN */ 87 88 static inline void kasan_unpoison_shadow(const void *address, size_t size) {} 89 90 static inline void kasan_unpoison_task_stack(struct task_struct *task) {} 91 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {} 92 93 static inline void kasan_enable_current(void) {} 94 static inline void kasan_disable_current(void) {} 95 96 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {} 97 static inline void kasan_free_pages(struct page *page, unsigned int order) {} 98 99 static inline void kasan_cache_create(struct kmem_cache *cache, 100 unsigned int *size, 101 slab_flags_t *flags) {} 102 103 static inline void kasan_poison_slab(struct page *page) {} 104 static inline void kasan_unpoison_object_data(struct kmem_cache *cache, 105 void *object) {} 106 static inline void kasan_poison_object_data(struct kmem_cache *cache, 107 void *object) {} 108 static inline void *kasan_init_slab_obj(struct kmem_cache *cache, 109 const void *object) 110 { 111 return (void *)object; 112 } 113 114 static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) 115 { 116 return ptr; 117 } 118 static inline void kasan_kfree_large(void *ptr, unsigned long ip) {} 119 static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {} 120 static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object, 121 size_t size, gfp_t flags) 122 { 123 return (void *)object; 124 } 125 static inline void *kasan_krealloc(const void *object, size_t new_size, 126 gfp_t flags) 127 { 128 return (void *)object; 129 } 130 131 static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object, 132 gfp_t flags) 133 { 134 return object; 135 } 136 static inline bool kasan_slab_free(struct kmem_cache *s, void *object, 137 unsigned long ip) 138 { 139 return false; 140 } 141 142 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; } 143 static inline void kasan_free_shadow(const struct vm_struct *vm) {} 144 145 static inline int kasan_add_zero_shadow(void *start, unsigned long size) 146 { 147 return 0; 148 } 149 static inline void kasan_remove_zero_shadow(void *start, 150 unsigned long size) 151 {} 152 153 static inline void kasan_unpoison_slab(const void *ptr) { } 154 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } 155 156 #endif /* CONFIG_KASAN */ 157 158 #ifdef CONFIG_KASAN_GENERIC 159 160 #define KASAN_SHADOW_INIT 0 161 162 void kasan_cache_shrink(struct kmem_cache *cache); 163 void kasan_cache_shutdown(struct kmem_cache *cache); 164 165 #else /* CONFIG_KASAN_GENERIC */ 166 167 static inline void kasan_cache_shrink(struct kmem_cache *cache) {} 168 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {} 169 170 #endif /* CONFIG_KASAN_GENERIC */ 171 172 #ifdef CONFIG_KASAN_SW_TAGS 173 174 #define KASAN_SHADOW_INIT 0xFF 175 176 void kasan_init_tags(void); 177 178 void *kasan_reset_tag(const void *addr); 179 180 void kasan_report(unsigned long addr, size_t size, 181 bool is_write, unsigned long ip); 182 183 #else /* CONFIG_KASAN_SW_TAGS */ 184 185 static inline void kasan_init_tags(void) { } 186 187 static inline void *kasan_reset_tag(const void *addr) 188 { 189 return (void *)addr; 190 } 191 192 #endif /* CONFIG_KASAN_SW_TAGS */ 193 194 #endif /* LINUX_KASAN_H */ 195