1 #ifndef _LINUX_KASAN_H 2 #define _LINUX_KASAN_H 3 4 #include <linux/types.h> 5 6 struct kmem_cache; 7 struct page; 8 struct vm_struct; 9 10 #ifdef CONFIG_KASAN 11 12 #define KASAN_SHADOW_SCALE_SHIFT 3 13 14 #include <asm/kasan.h> 15 #include <asm/pgtable.h> 16 17 extern unsigned char kasan_zero_page[PAGE_SIZE]; 18 extern pte_t kasan_zero_pte[PTRS_PER_PTE]; 19 extern pmd_t kasan_zero_pmd[PTRS_PER_PMD]; 20 extern pud_t kasan_zero_pud[PTRS_PER_PUD]; 21 22 void kasan_populate_zero_shadow(const void *shadow_start, 23 const void *shadow_end); 24 25 static inline void *kasan_mem_to_shadow(const void *addr) 26 { 27 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT) 28 + KASAN_SHADOW_OFFSET; 29 } 30 31 /* Enable reporting bugs after kasan_disable_current() */ 32 extern void kasan_enable_current(void); 33 34 /* Disable reporting bugs for current task */ 35 extern void kasan_disable_current(void); 36 37 void kasan_unpoison_shadow(const void *address, size_t size); 38 39 void kasan_unpoison_task_stack(struct task_struct *task); 40 void kasan_unpoison_stack_above_sp_to(const void *watermark); 41 42 void kasan_alloc_pages(struct page *page, unsigned int order); 43 void kasan_free_pages(struct page *page, unsigned int order); 44 45 void kasan_cache_create(struct kmem_cache *cache, size_t *size, 46 unsigned long *flags); 47 void kasan_cache_shrink(struct kmem_cache *cache); 48 void kasan_cache_shutdown(struct kmem_cache *cache); 49 50 void kasan_poison_slab(struct page *page); 51 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object); 52 void kasan_poison_object_data(struct kmem_cache *cache, void *object); 53 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object); 54 55 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); 56 void kasan_kfree_large(const void *ptr); 57 void kasan_poison_kfree(void *ptr); 58 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, 59 gfp_t flags); 60 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags); 61 62 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags); 63 bool kasan_slab_free(struct kmem_cache *s, void *object); 64 65 struct kasan_cache { 66 int alloc_meta_offset; 67 int free_meta_offset; 68 }; 69 70 int kasan_module_alloc(void *addr, size_t size); 71 void kasan_free_shadow(const struct vm_struct *vm); 72 73 size_t ksize(const void *); 74 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); } 75 size_t kasan_metadata_size(struct kmem_cache *cache); 76 77 #else /* CONFIG_KASAN */ 78 79 static inline void kasan_unpoison_shadow(const void *address, size_t size) {} 80 81 static inline void kasan_unpoison_task_stack(struct task_struct *task) {} 82 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {} 83 84 static inline void kasan_enable_current(void) {} 85 static inline void kasan_disable_current(void) {} 86 87 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {} 88 static inline void kasan_free_pages(struct page *page, unsigned int order) {} 89 90 static inline void kasan_cache_create(struct kmem_cache *cache, 91 size_t *size, 92 unsigned long *flags) {} 93 static inline void kasan_cache_shrink(struct kmem_cache *cache) {} 94 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {} 95 96 static inline void kasan_poison_slab(struct page *page) {} 97 static inline void kasan_unpoison_object_data(struct kmem_cache *cache, 98 void *object) {} 99 static inline void kasan_poison_object_data(struct kmem_cache *cache, 100 void *object) {} 101 static inline void kasan_init_slab_obj(struct kmem_cache *cache, 102 const void *object) {} 103 104 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {} 105 static inline void kasan_kfree_large(const void *ptr) {} 106 static inline void kasan_poison_kfree(void *ptr) {} 107 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object, 108 size_t size, gfp_t flags) {} 109 static inline void kasan_krealloc(const void *object, size_t new_size, 110 gfp_t flags) {} 111 112 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object, 113 gfp_t flags) {} 114 static inline bool kasan_slab_free(struct kmem_cache *s, void *object) 115 { 116 return false; 117 } 118 119 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; } 120 static inline void kasan_free_shadow(const struct vm_struct *vm) {} 121 122 static inline void kasan_unpoison_slab(const void *ptr) { } 123 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } 124 125 #endif /* CONFIG_KASAN */ 126 127 #endif /* LINUX_KASAN_H */ 128