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_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 extern p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D]; 22 23 int 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 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 void kasan_cache_shrink(struct kmem_cache *cache); 49 void kasan_cache_shutdown(struct kmem_cache *cache); 50 51 void kasan_poison_slab(struct page *page); 52 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object); 53 void kasan_poison_object_data(struct kmem_cache *cache, void *object); 54 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object); 55 56 void kasan_kmalloc_large(const void *ptr, size_t size, 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 kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, 60 gfp_t flags); 61 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags); 62 63 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags); 64 bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip); 65 66 struct kasan_cache { 67 int alloc_meta_offset; 68 int free_meta_offset; 69 }; 70 71 int kasan_module_alloc(void *addr, size_t size); 72 void kasan_free_shadow(const struct vm_struct *vm); 73 74 int kasan_add_zero_shadow(void *start, unsigned long size); 75 void kasan_remove_zero_shadow(void *start, unsigned long size); 76 77 size_t ksize(const void *); 78 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); } 79 size_t kasan_metadata_size(struct kmem_cache *cache); 80 81 bool kasan_save_enable_multi_shot(void); 82 void kasan_restore_multi_shot(bool enabled); 83 84 #else /* CONFIG_KASAN */ 85 86 static inline void kasan_unpoison_shadow(const void *address, size_t size) {} 87 88 static inline void kasan_unpoison_task_stack(struct task_struct *task) {} 89 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {} 90 91 static inline void kasan_enable_current(void) {} 92 static inline void kasan_disable_current(void) {} 93 94 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {} 95 static inline void kasan_free_pages(struct page *page, unsigned int order) {} 96 97 static inline void kasan_cache_create(struct kmem_cache *cache, 98 unsigned int *size, 99 slab_flags_t *flags) {} 100 static inline void kasan_cache_shrink(struct kmem_cache *cache) {} 101 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {} 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 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {} 112 static inline void kasan_kfree_large(void *ptr, unsigned long ip) {} 113 static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {} 114 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object, 115 size_t size, gfp_t flags) {} 116 static inline void kasan_krealloc(const void *object, size_t new_size, 117 gfp_t flags) {} 118 119 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object, 120 gfp_t flags) {} 121 static inline bool kasan_slab_free(struct kmem_cache *s, void *object, 122 unsigned long ip) 123 { 124 return false; 125 } 126 127 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; } 128 static inline void kasan_free_shadow(const struct vm_struct *vm) {} 129 130 static inline int kasan_add_zero_shadow(void *start, unsigned long size) 131 { 132 return 0; 133 } 134 static inline void kasan_remove_zero_shadow(void *start, 135 unsigned long size) 136 {} 137 138 static inline void kasan_unpoison_slab(const void *ptr) { } 139 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } 140 141 #endif /* CONFIG_KASAN */ 142 143 #endif /* LINUX_KASAN_H */ 144