1 #ifndef _LINUX_KASAN_H 2 #define _LINUX_KASAN_H 3 4 #include <linux/sched.h> 5 #include <linux/types.h> 6 7 struct kmem_cache; 8 struct page; 9 struct vm_struct; 10 11 #ifdef CONFIG_KASAN 12 13 #define KASAN_SHADOW_SCALE_SHIFT 3 14 15 #include <asm/kasan.h> 16 #include <asm/pgtable.h> 17 18 extern unsigned char kasan_zero_page[PAGE_SIZE]; 19 extern pte_t kasan_zero_pte[PTRS_PER_PTE]; 20 extern pmd_t kasan_zero_pmd[PTRS_PER_PMD]; 21 extern pud_t kasan_zero_pud[PTRS_PER_PUD]; 22 23 void kasan_populate_zero_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 static inline void kasan_enable_current(void) 34 { 35 current->kasan_depth++; 36 } 37 38 /* Disable reporting bugs for current task */ 39 static inline void kasan_disable_current(void) 40 { 41 current->kasan_depth--; 42 } 43 44 void kasan_unpoison_shadow(const void *address, size_t size); 45 46 void kasan_unpoison_task_stack(struct task_struct *task); 47 48 void kasan_alloc_pages(struct page *page, unsigned int order); 49 void kasan_free_pages(struct page *page, unsigned int order); 50 51 void kasan_cache_create(struct kmem_cache *cache, size_t *size, 52 unsigned long *flags); 53 void kasan_cache_shrink(struct kmem_cache *cache); 54 void kasan_cache_destroy(struct kmem_cache *cache); 55 56 void kasan_poison_slab(struct page *page); 57 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object); 58 void kasan_poison_object_data(struct kmem_cache *cache, void *object); 59 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object); 60 61 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); 62 void kasan_kfree_large(const void *ptr); 63 void kasan_poison_kfree(void *ptr); 64 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, 65 gfp_t flags); 66 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags); 67 68 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags); 69 bool kasan_slab_free(struct kmem_cache *s, void *object); 70 71 struct kasan_cache { 72 int alloc_meta_offset; 73 int free_meta_offset; 74 }; 75 76 int kasan_module_alloc(void *addr, size_t size); 77 void kasan_free_shadow(const struct vm_struct *vm); 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 #else /* CONFIG_KASAN */ 84 85 static inline void kasan_unpoison_shadow(const void *address, size_t size) {} 86 87 static inline void kasan_unpoison_task_stack(struct task_struct *task) {} 88 89 static inline void kasan_enable_current(void) {} 90 static inline void kasan_disable_current(void) {} 91 92 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {} 93 static inline void kasan_free_pages(struct page *page, unsigned int order) {} 94 95 static inline void kasan_cache_create(struct kmem_cache *cache, 96 size_t *size, 97 unsigned long *flags) {} 98 static inline void kasan_cache_shrink(struct kmem_cache *cache) {} 99 static inline void kasan_cache_destroy(struct kmem_cache *cache) {} 100 101 static inline void kasan_poison_slab(struct page *page) {} 102 static inline void kasan_unpoison_object_data(struct kmem_cache *cache, 103 void *object) {} 104 static inline void kasan_poison_object_data(struct kmem_cache *cache, 105 void *object) {} 106 static inline void kasan_init_slab_obj(struct kmem_cache *cache, 107 const void *object) {} 108 109 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {} 110 static inline void kasan_kfree_large(const void *ptr) {} 111 static inline void kasan_poison_kfree(void *ptr) {} 112 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object, 113 size_t size, gfp_t flags) {} 114 static inline void kasan_krealloc(const void *object, size_t new_size, 115 gfp_t flags) {} 116 117 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object, 118 gfp_t flags) {} 119 static inline bool kasan_slab_free(struct kmem_cache *s, void *object) 120 { 121 return false; 122 } 123 124 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; } 125 static inline void kasan_free_shadow(const struct vm_struct *vm) {} 126 127 static inline void kasan_unpoison_slab(const void *ptr) { } 128 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } 129 130 #endif /* CONFIG_KASAN */ 131 132 #endif /* LINUX_KASAN_H */ 133