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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 | ||
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 | ||
60 | void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); | |
61 | void kasan_kfree_large(const void *ptr); | |
62 | void kasan_poison_kfree(void *ptr); | |
63 | void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, | |
64 | gfp_t flags); | |
65 | void kasan_krealloc(const void *object, size_t new_size, gfp_t flags); | |
66 | ||
67 | void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags); | |
68 | bool kasan_slab_free(struct kmem_cache *s, void *object); | |
69 | ||
70 | struct kasan_cache { | |
71 | int alloc_meta_offset; | |
72 | int free_meta_offset; | |
73 | }; | |
74 | ||
75 | int kasan_module_alloc(void *addr, size_t size); | |
76 | void kasan_free_shadow(const struct vm_struct *vm); | |
77 | ||
78 | size_t ksize(const void *); | |
79 | static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); } | |
80 | ||
81 | #else /* CONFIG_KASAN */ | |
82 | ||
83 | static inline void kasan_unpoison_shadow(const void *address, size_t size) {} | |
84 | ||
85 | static inline void kasan_unpoison_task_stack(struct task_struct *task) {} | |
86 | ||
87 | static inline void kasan_enable_current(void) {} | |
88 | static inline void kasan_disable_current(void) {} | |
89 | ||
90 | static inline void kasan_alloc_pages(struct page *page, unsigned int order) {} | |
91 | static inline void kasan_free_pages(struct page *page, unsigned int order) {} | |
92 | ||
93 | static inline void kasan_cache_create(struct kmem_cache *cache, | |
94 | size_t *size, | |
95 | unsigned long *flags) {} | |
96 | static inline void kasan_cache_shrink(struct kmem_cache *cache) {} | |
97 | static inline void kasan_cache_destroy(struct kmem_cache *cache) {} | |
98 | ||
99 | static inline void kasan_poison_slab(struct page *page) {} | |
100 | static inline void kasan_unpoison_object_data(struct kmem_cache *cache, | |
101 | void *object) {} | |
102 | static inline void kasan_poison_object_data(struct kmem_cache *cache, | |
103 | void *object) {} | |
104 | ||
105 | static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {} | |
106 | static inline void kasan_kfree_large(const void *ptr) {} | |
107 | static inline void kasan_poison_kfree(void *ptr) {} | |
108 | static inline void kasan_kmalloc(struct kmem_cache *s, const void *object, | |
109 | size_t size, gfp_t flags) {} | |
110 | static inline void kasan_krealloc(const void *object, size_t new_size, | |
111 | gfp_t flags) {} | |
112 | ||
113 | static inline void kasan_slab_alloc(struct kmem_cache *s, void *object, | |
114 | gfp_t flags) {} | |
115 | static inline bool kasan_slab_free(struct kmem_cache *s, void *object) | |
116 | { | |
117 | return false; | |
118 | } | |
119 | ||
120 | static inline int kasan_module_alloc(void *addr, size_t size) { return 0; } | |
121 | static inline void kasan_free_shadow(const struct vm_struct *vm) {} | |
122 | ||
123 | static inline void kasan_unpoison_slab(const void *ptr) { } | |
124 | ||
125 | #endif /* CONFIG_KASAN */ | |
126 | ||
127 | #endif /* LINUX_KASAN_H */ |