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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 | #define KASAN_SHADOW_SCALE_SHIFT 3 | |
15 | ||
16 | #include <asm/kasan.h> | |
17 | #include <asm/pgtable.h> | |
18 | ||
19 | extern unsigned char kasan_zero_page[PAGE_SIZE]; | |
20 | extern pte_t kasan_zero_pte[PTRS_PER_PTE]; | |
21 | extern pmd_t kasan_zero_pmd[PTRS_PER_PMD]; | |
22 | extern pud_t kasan_zero_pud[PTRS_PER_PUD]; | |
23 | extern p4d_t kasan_zero_p4d[PTRS_PER_P4D]; | |
24 | ||
25 | void kasan_populate_zero_shadow(const void *shadow_start, | |
26 | const void *shadow_end); | |
27 | ||
28 | static inline void *kasan_mem_to_shadow(const void *addr) | |
29 | { | |
30 | return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT) | |
31 | + KASAN_SHADOW_OFFSET; | |
32 | } | |
33 | ||
34 | /* Enable reporting bugs after kasan_disable_current() */ | |
35 | extern void kasan_enable_current(void); | |
36 | ||
37 | /* Disable reporting bugs for current task */ | |
38 | extern void kasan_disable_current(void); | |
39 | ||
40 | void kasan_unpoison_shadow(const void *address, size_t size); | |
41 | ||
42 | void kasan_unpoison_task_stack(struct task_struct *task); | |
43 | void kasan_unpoison_stack_above_sp_to(const void *watermark); | |
44 | ||
45 | void kasan_alloc_pages(struct page *page, unsigned int order); | |
46 | void kasan_free_pages(struct page *page, unsigned int order); | |
47 | ||
48 | void kasan_cache_create(struct kmem_cache *cache, size_t *size, | |
49 | slab_flags_t *flags); | |
50 | void kasan_cache_shrink(struct kmem_cache *cache); | |
51 | void kasan_cache_shutdown(struct kmem_cache *cache); | |
52 | ||
53 | void kasan_poison_slab(struct page *page); | |
54 | void kasan_unpoison_object_data(struct kmem_cache *cache, void *object); | |
55 | void kasan_poison_object_data(struct kmem_cache *cache, void *object); | |
56 | void kasan_init_slab_obj(struct kmem_cache *cache, const void *object); | |
57 | ||
58 | void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); | |
59 | void kasan_kfree_large(const void *ptr); | |
60 | void kasan_poison_kfree(void *ptr); | |
61 | void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, | |
62 | gfp_t flags); | |
63 | void kasan_krealloc(const void *object, size_t new_size, gfp_t flags); | |
64 | ||
65 | void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags); | |
66 | bool kasan_slab_free(struct kmem_cache *s, void *object); | |
67 | ||
68 | struct kasan_cache { | |
69 | int alloc_meta_offset; | |
70 | int free_meta_offset; | |
71 | }; | |
72 | ||
73 | int kasan_module_alloc(void *addr, size_t size); | |
74 | void kasan_free_shadow(const struct vm_struct *vm); | |
75 | ||
76 | size_t ksize(const void *); | |
77 | static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); } | |
78 | size_t kasan_metadata_size(struct kmem_cache *cache); | |
79 | ||
80 | bool kasan_save_enable_multi_shot(void); | |
81 | void kasan_restore_multi_shot(bool enabled); | |
82 | ||
83 | #else /* CONFIG_KASAN */ | |
84 | ||
85 | static inline void kasan_unpoison_shadow(const void *address, size_t size) {} | |
86 | ||
87 | static inline void kasan_unpoison_task_stack(struct task_struct *task) {} | |
88 | static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {} | |
89 | ||
90 | static inline void kasan_enable_current(void) {} | |
91 | static inline void kasan_disable_current(void) {} | |
92 | ||
93 | static inline void kasan_alloc_pages(struct page *page, unsigned int order) {} | |
94 | static inline void kasan_free_pages(struct page *page, unsigned int order) {} | |
95 | ||
96 | static inline void kasan_cache_create(struct kmem_cache *cache, | |
97 | size_t *size, | |
98 | slab_flags_t *flags) {} | |
99 | static inline void kasan_cache_shrink(struct kmem_cache *cache) {} | |
100 | static inline void kasan_cache_shutdown(struct kmem_cache *cache) {} | |
101 | ||
102 | static inline void kasan_poison_slab(struct page *page) {} | |
103 | static inline void kasan_unpoison_object_data(struct kmem_cache *cache, | |
104 | void *object) {} | |
105 | static inline void kasan_poison_object_data(struct kmem_cache *cache, | |
106 | void *object) {} | |
107 | static inline void kasan_init_slab_obj(struct kmem_cache *cache, | |
108 | const void *object) {} | |
109 | ||
110 | static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {} | |
111 | static inline void kasan_kfree_large(const void *ptr) {} | |
112 | static inline void kasan_poison_kfree(void *ptr) {} | |
113 | static inline void kasan_kmalloc(struct kmem_cache *s, const void *object, | |
114 | size_t size, gfp_t flags) {} | |
115 | static inline void kasan_krealloc(const void *object, size_t new_size, | |
116 | gfp_t flags) {} | |
117 | ||
118 | static inline void kasan_slab_alloc(struct kmem_cache *s, void *object, | |
119 | gfp_t flags) {} | |
120 | static inline bool kasan_slab_free(struct kmem_cache *s, void *object) | |
121 | { | |
122 | return false; | |
123 | } | |
124 | ||
125 | static inline int kasan_module_alloc(void *addr, size_t size) { return 0; } | |
126 | static inline void kasan_free_shadow(const struct vm_struct *vm) {} | |
127 | ||
128 | static inline void kasan_unpoison_slab(const void *ptr) { } | |
129 | static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } | |
130 | ||
131 | #endif /* CONFIG_KASAN */ | |
132 | ||
133 | #endif /* LINUX_KASAN_H */ |