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 #include <linux/sched.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
kasan_mem_to_shadow(const void * addr)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() */
kasan_enable_current(void)33 static inline void kasan_enable_current(void)
34 {
35 current->kasan_depth++;
36 }
37
38 /* Disable reporting bugs for current task */
kasan_disable_current(void)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_alloc_pages(struct page *page, unsigned int order);
47 void kasan_free_pages(struct page *page, unsigned int order);
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
53 void kasan_kmalloc_large(const void *ptr, size_t size);
54 void kasan_kfree_large(const void *ptr);
55 void kasan_kfree(void *ptr);
56 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size);
57 void kasan_krealloc(const void *object, size_t new_size);
58
59 void kasan_slab_alloc(struct kmem_cache *s, void *object);
60 void kasan_slab_free(struct kmem_cache *s, void *object);
61
62 int kasan_module_alloc(void *addr, size_t size);
63 void kasan_free_shadow(const struct vm_struct *vm);
64
65 #else /* CONFIG_KASAN */
66
kasan_unpoison_shadow(const void * address,size_t size)67 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
68
kasan_enable_current(void)69 static inline void kasan_enable_current(void) {}
kasan_disable_current(void)70 static inline void kasan_disable_current(void) {}
71
kasan_alloc_pages(struct page * page,unsigned int order)72 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
kasan_free_pages(struct page * page,unsigned int order)73 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
74
kasan_poison_slab(struct page * page)75 static inline void kasan_poison_slab(struct page *page) {}
kasan_unpoison_object_data(struct kmem_cache * cache,void * object)76 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
77 void *object) {}
kasan_poison_object_data(struct kmem_cache * cache,void * object)78 static inline void kasan_poison_object_data(struct kmem_cache *cache,
79 void *object) {}
80
kasan_kmalloc_large(void * ptr,size_t size)81 static inline void kasan_kmalloc_large(void *ptr, size_t size) {}
kasan_kfree_large(const void * ptr)82 static inline void kasan_kfree_large(const void *ptr) {}
kasan_kfree(void * ptr)83 static inline void kasan_kfree(void *ptr) {}
kasan_kmalloc(struct kmem_cache * s,const void * object,size_t size)84 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
85 size_t size) {}
kasan_krealloc(const void * object,size_t new_size)86 static inline void kasan_krealloc(const void *object, size_t new_size) {}
87
kasan_slab_alloc(struct kmem_cache * s,void * object)88 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object) {}
kasan_slab_free(struct kmem_cache * s,void * object)89 static inline void kasan_slab_free(struct kmem_cache *s, void *object) {}
90
kasan_module_alloc(void * addr,size_t size)91 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
kasan_free_shadow(const struct vm_struct * vm)92 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
93
94 #endif /* CONFIG_KASAN */
95
96 #endif /* LINUX_KASAN_H */
97