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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 void kasan_unpoison_stack_above_sp_to(const void *watermark);
48
49 void kasan_alloc_pages(struct page *page, unsigned int order);
50 void kasan_free_pages(struct page *page, unsigned int order);
51
52 void kasan_cache_create(struct kmem_cache *cache, size_t *size,
53 unsigned long *flags);
54 void kasan_cache_shrink(struct kmem_cache *cache);
55 void kasan_cache_destroy(struct kmem_cache *cache);
56
57 void kasan_poison_slab(struct page *page);
58 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
59 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
60 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
61
62 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
63 void kasan_kfree_large(const void *ptr);
64 void kasan_poison_kfree(void *ptr);
65 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
66 gfp_t flags);
67 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
68
69 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
70 bool kasan_slab_free(struct kmem_cache *s, void *object);
71
72 struct kasan_cache {
73 int alloc_meta_offset;
74 int free_meta_offset;
75 };
76
77 int kasan_module_alloc(void *addr, size_t size);
78 void kasan_free_shadow(const struct vm_struct *vm);
79
80 size_t ksize(const void *);
81 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
82 size_t kasan_metadata_size(struct kmem_cache *cache);
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 size_t *size,
99 unsigned long *flags) {}
100 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
101 static inline void kasan_cache_destroy(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(const void *ptr) {}
113 static inline void kasan_poison_kfree(void *ptr) {}
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 {
123 return false;
124 }
125
126 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
127 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
128
129 static inline void kasan_unpoison_slab(const void *ptr) { }
130 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
131
132 #endif /* CONFIG_KASAN */
133
134 #endif /* LINUX_KASAN_H */